Report to/Rapport au :

Planning and Environment Committee

Comité de l’urbanisme et de l’aménagement

and Council / et au Conseil

25 October 2005/le 25 octobre 2005

Submitted by/Soumis par : R.G. Hewitt,

Acting Deputy City Manager/ Directeur municipal adjoint intérimaire

Public Works and Services/Services et Travaux Publics

Contact Person/Personne ressource :

W.R. Newell, P.Eng., Acting Director, Infrastructure Services/

Directeur intérimaire, Services d'infrastructure

(613) 580-2424 x16002, Wayne.Newell@ottawa.ca

City Wide

Ref N°: ACS2005-PWS-INF-0006

SUBJECT: BASEMENT FLOODING REVIEW –
SUMMARY OF INVESTIGATIONS AND ACTION PLAN

OBJET : ÉTUDE DE L’INONDATION DES SOUS-SOLS -
SOMMAIRE DES ENQUÊTES ET PLAN D'ACTION

REPORT RECOMMENDATION

That the Planning and Environment Committee and Council receive this report for information.

RECOMMANDATION DU RAPPORT

Que le Comité de l’urbanisme et de l’environnement et le Conseil municipal prennent connaissance du présent rapport à titre d’information.

EXECUTIVE SUMMARY

Analysis

Basement flooding can happens in Ottawa as it does in many other cities across North America. The impacts of Hurricane Francis on September 9, 2004 are a reminder of this susceptibility. This event caused flooding on streets and in nearly 1,800 homes throughout the City. Damage was extensive. While for some residents, the basement flooding that occurred as a result of the extreme rainfall of September 9 was a first occurrence, for many residents basement flooding from City sewer backup hasbecome a repeated occurrence happened on more than one occasion.

Subsequent to the September 9 event, staff committed to Council to undertake detailed investigations to determine why certain areas were more susceptible to repeated occurrences of basement flooding and to provide sewer system improvement options to increase the level of service and reduce the frequency of basement flooding occurrences. This commitment is reflected in the City’s Corporate Plan approved by Council on 28 September 2005.

Specifically, the investigations focused on the following key objectives:

1. Find the main causes of flooding in neighbourhoods at risk;
2. Identify an action plan with options, costs and timelines for implementing solutions;
3. Improve communications with residents to promote flow removal from the sewer systems, how to implement protective plumbing measures, what to do in the event of basement flooding, etc;

The following are key outcomes and proposed actions:

1. The specific cause of basement flooding has been determined for 33 of 36 neighbourhoods. The remaining locations are subject to further investigations before confirming an appropriate solution.
2. Solutions or mitigating measures have been identified for implementation as part of the 2006 Draft Capital Budget in 26 of 36 neighbourhoods. Of the remaining 10 locations, 2 require an Environmental Assessment, 5 require detailed design and contract preparation and 3 require further investigations. Funding has also been identified in the 2006 Draft Capital Budget to complete the additional engineering work prior to proceeding with construction in 2007 and beyond.
3. Sewers in all neighbourhoods that experienced basement flooding as a result of the September 9, 2004 event were inspected and are free of obstructions.
4. The Department has been working on initiatives focused on removing stormwater from the sanitary sewer system, including changing improper maintenance covers, working with other City departments on reducing the flow contributions from outdoor wading pools and with private property owners to remove stormwater flows from flat roofs to the sanitary sewer system.
5. Up to the end of September 2005, 300 protective plumbing applications have been received. These have the benefit of increasing the level of protection against basement flooding from a City sewer backup.
6. Subsequent to the September 9, 2004 event, the Department delivered over 800 letters to residents in neighbourhoods that experienced basement flooding related to a City sewer backup. Another 700 letters were delivered to residents with an offer to have the service connection (sewer lateral) inspected since the flooding was not deemed to be the result of a City sewer backup but more likely a localized problem.
7. The Department has improved the information for residents available on the City’s website regarding basement flooding, flow removal tips and the Residential Protective Plumbing Program.
8. The Department has developed a flow removal “checklist” titled “Help Yourself – Help Your Neighbour, Basement Flooding Prevention” with tips residents can use to reduce the amount of storm or ground water that enters the sanitary sewer system. This “checklist” has been delivered to approximately 12,000 residents in neighbourhoods susceptible to basement flooding, is posted on the City’s website and is available at all Client Service Centres.
9. The Department, in consultation with other departments and members of the community, is developing an information brochure that will assist residents with key information in the event of another flooding occurrence.
10. The Department has improved its readiness in the event of another major flooding event.

Public Consultation

Since September 9, 2004, several consultation initiatives have been undertaken, such as:

- Staff attended 8 public meetings in various wards more seriously impacted by the flooding event to provide information related to the basement flooding review.

- Basement flooding mitigation was identified as a priority in the City’s Corporate Plan. Public consultation was carried out as part of the approval process.

- Advisory committee meetings and open houses were held as part of Environmental Assessments undertaken in 2005 for Sandy Hill and O’Connor flooding investigations.

- The Department consulted with Councillors regarding basement flooding issues in their wards.

Financial Implications

The 2006 Draft Capital Budget will identify an estimated $22 million,360,000 to fund sewer system improvements related to basement flooding. In many instances these will be carried out as part of coordinated projects (e.g. road, water, sewer). The 2007 to 2010 preliminary capital requirements to address remaining sewer improvements are estimated at $22 million,000,000 (based on current available information). Fundsare will be available in the Rate Supported Reserve Fund to cover these expenditures.

RÉSUMÉ

Analyse

L’inondation des sous-sols est un phénomène qui peut survenir autant à Ottawa que dans beaucoup d’autres villes à travers l’Amérique du Nord. Les répercussions de l'ouragan Francis survenu le 9 septembre 2004 nous rappellent cette vulnérabilité. Cet événement a provoqué l'inondation des rues et près de 1 800 maisons ont été touchées d’un bout à l’autre de la Ville. Les dommages ont été sévères. Pour certains résidents, l’inondation de leur sous-sol causée par les pluies torrentielles du 9 septembre fut une première expérience. Par contre, pour beaucoup d’autres, ce type d’événement causé par le refoulement des égouts municipauxest devenu chose courante est survenue à plusieurs reprises.

Depuis cet événement du 9 septembre, le personnel s'est engagé devant le Conseil à entreprendre des enquêtes approfondies afin de déterminer pourquoi certains secteurs présentent plus de risques face à des inondations répétées de sous-sols et à apporter des recommandations quant à des améliorations du réseau d'égouts, afin de rehausser le niveau de service et de réduire la fréquence des inondations de sous-sols. Cet engagement s’inscrit dans le Plan directeur de la Ville approuvé par le Conseil le 28 septembre 2005.

L’étude s’est penchée sur les principaux objectifs suivants :

1. trouver les causes principales des inondations dans les quartiers à risque;
2. élaborer un plan d’action comportant alternatives, coûts et échéanciers pour mettre en place des solutions;
3. améliorer les communications avec les résidents afin de favoriser la réduction du flux dans le réseau d’égouts, les renseigner sur des méthodes de mise en œuvre de dispositifs protecteurs sanitaires et les informer sur la marche à suivre advenant l’inondation de leur sous-sol, entre autres.

Les principaux points suivants ressortent du processus d’étude :

1. La cause spécifique des inondations de sous-sols a été déterminée dans 33 quartiers sur 36. Les autres emplacements font l’objet d’enquêtes plus approfondies qui viendront confirmer la cause.
2. Des solutions ou de mesures d’atténuation ont été identifiées à des fins de mise en œuvre dans le cadre de la version préliminaire du budget des immobilisations pour l’année 2006 dans 26 quartiers sur 36. Pour les 10 quartiers qui restent, 2 nécessitent une évaluation environnementale, 5 requièrent une conception détaillée et la préparation de contrat et 3 nécessitent des enquêtes plus détaillées. Des fonds ont aussi été prévus dans la version préliminaire du budget des immobilisations 2006 afin de compléter les ouvrages de génie civil additionnels avant d'entreprendre la construction à partir de 2007.
3. Les égouts dans tous les quartiers touchés par les inondations de sous-sol causées par l'événement du 9 septembre 2004 ont été inspectés. Ils sont libres de toute obstruction.
4. Le Service a travaillé sur des projets visant à retirer les eaux pluviales du réseau d’égouts sanitaire, notamment en remplaçant les regards d’égouts inappropriés, en collaborant avec d'autres services de la Ville afin de réduire l’écoulement provenant des pataugeoires extérieures et avec des propriétaires privés en vue de débrancher les toits plats du réseau d'égouts sanitaire.
5. Jusqu’à la fin septembre 2005, plus de 300 applications pour le Programme des dispositifs protecteurs sanitaires ont été reçu. Ces mesures présentent l’avantage d’accroître le niveau de protection contre les inondations de sous-sols causés par des refoulements d’égouts de la Ville.
6. Après l’événement du 9 septembre 2004, le Service a livré plus de 800 lettres aux résidents des quartiers qui ont subi des inondations de sous-sols liées à un refoulement d’égouts de la Ville. Quelque 700 autres lettres ont été envoyées à des résidents leur offrant de vérifier la conduite de raccordement (obstruction latérale de l’égout) étant donné que l'inondation ne semblait pas résulter d'un refoulement d'égouts mais plutôt d'un problème spécifique.
7. Le Service a mis à jour les renseignements disponibles pour les résidents sur le site Web de la Ville dans une section sur les inondations de sous-sols. Cette section donne aussi des conseils en matière de débranchement et séparation ainsi que des informations sur le Programme des dispositifs protecteurs sanitaires.
8. Le Service a conçu un document sur la réduction du flux du genre « liste de vérification » intitulé « Pour vous, pour votre voisin, la prévention contre les inondations de votre sous-sol » qui procure des conseils aux résidents afin de réduire la quantité d’eaux pluviales ou souterraines qui pénètre dans le réseau d’égouts sanitaire. Cette « liste de vérification » a été distribuée à près de 12 000 résidents dans les quartiers présentant le plus de risques d’inondation de sous-sol. Elle a aussi été ajoutée sur le site Web de la Ville et elle est disponible dans les Centres du service à la clientèle.
9. Le Service, en collaboration avec d’autres services et membres de la communauté, est à élaborer un guide à l’intention des résidents qui leur apportera des renseignements importants dans l’éventualité d’une autre inondation.
10. Le Service a revu son dispositif d’urgence advenant une autre inondation majeure.

Consultation publique

Depuis le 9 septembre 2004, de nombreuses initiatives de consultation ont été entreprises, notamment :

- Le personnel a participé à 8 rencontres publiques afin de fournir des renseignements sur l'événement survenu, le réseau d’égouts, les causes et les prochaines étapes en termes d’enquêtes détaillées.

- La réduction des impacts des inondations de sous-sols causées par des refoulements d’égouts a été déterminée comme une priorité dans le Plan directeur de la Ville. Une consultation publique a été réalisée dans le cadre du processus d’approbation.

- Des consultations publiques sous formes de réunions avec le Comité consultatif et des sessions portes ouvertes se sont tenues dans le cadre des évaluations environnementales distinctes entreprises en 2005 pour la Côte de Sable et le secteur O’Connor.

- Le Service a consulté les conseillers par rapport aux inondations de sous-sols qui sont survenues dans leur quartier.

Conséquences sur le plan financier

La version préliminaire du budget des immobilisations 2006 mettra en réserve environ 22360 000 millions$ qui viendront financer les améliorations au réseau d'égouts. Les fonds d’immobilisation pour la période entre 2007 et 2010 sont évalués à 22000 000 millions$ (basée sur l’information qui est disponible). Des fondssont seront disponibles dans le Fonds de réserve financé par la tarification de services afin de payer ces dépenses.

BACKGROUND

Basement floodingcan happens in Ottawa as it does in many other cities across North America. The impacts of Hurricane Francis on September 9, 2004 are a reminder of this susceptibility. This event caused flooding on streets and in nearly 1,800 homes throughout the City. Damage was extensive. While for some residents, the basement flooding that occurred as a result of the extreme rainfall of September 9 was a first occurrence, for many residents basement flooding from City sewer backup hasbecome a repeated occurrence happened on more than one occasion.

Subsequent to the September 9 event, staff committed to Council to undertake detailed investigations to determine why certain areas were more susceptible to repeated occurrences of basement flooding and to provide sewer system improvement options to increase the level of service and reduce the frequency of basement flooding occurrences. This commitment is reflected in the City’s Corporate Plan approved by Council on 28 September 2005.

Specifically, the investigations focused on the following key objectives:

4. Determine the main causes of flooding in neighbourhoods at risk;
5. Identify an action plan with options, costs and timelines for implementing solutions;
6. Improve communications with residents to promote flow removal from the sewer systems, how to implement protective plumbing measures, what to do in the event of basement flooding, etc.

DISCUSSION

The Sewer Systems

The City's stormwater and sanitary sewer systems are designed and built in accordance with recognized standards to convey flows generated through a combination of wastewater discharge and wet weather influences. "Stormwater" means wet weather runoff that is collectedaround from roads, parks, rooftops, private property and building footing drains. "Sanitary sewage" means wastewater that comes from toilets, showers, floor drains, sinks and other plumbing fixtures.

The sewer systems in the City of Ottawa are comprised of combined sewers, partially separated sewers and separated sewers. Combined sewers have a single sewer pipe sized to capture stormwater and sanitary sewage. These are concentrated in the core of the City. Partially separated sewers have an open ditch or storm sewer sized to capture stormwater and a separate sanitary sewer pipe sized to capture sanitary sewage. However, the ditches or storm sewers are only of sufficient depth to capture surface runoff. Foundation drains are connected to the deeper sanitary sewer. These are typically located within the Greenbelt. Sewer systems in new developments built after 1961 are fully separated systems. The storm sewers capture surface runoff and foundation drains, and the sanitary sewers capture sanitary sewage. These are typically located outside the Greenbelt.

The City’s sewer systems are designed to handle above average flow conditions and have limited capacity. It is not feasible to construct systems The level of service that a sewer system can be designed to provide may be limited due to physical or outlet constraints, feasibility of implementation, ability to accommodate changing climate conditions and costs. In certain circumstances there are limited viable options to improve the level of service in the absence of an overall system upgrade. Therefore, sewer systems cannot be constructed to eliminate the possibility of basement flooding resulting from sewer backups in all circumstancesIn many instances providing larger pipes may not be a feasible solution. Flow removal initiatives may be an option that will help reduce the pressures on the system. With an aging system and climate changes, it is anticipated these systems will be subject to increasing pressures.

General Causes of Basement Flooding from City Sewer Backups

It is important to understand the underlying problems that lead to occurrences of basement flooding. During dry weather conditions, the sanitary sewer system operates in an acceptable manner. The system begins to be under pressure during wet weather events, such as extreme rainfall events or significant events combined with snowmelt or previous wet conditions.

Combined and partially separated sewer systems are more susceptible to surcharging during large wet weather events due to the variability of stormwater flows. Weather and ground conditions (e.g. ground saturation levels, frost penetration, etc.), melting snow, rainfall intensity and longer duration events, as well as any combination of these occurrences, influence the load placed on the sewer system. In certain conditions, the loadings put on the systems The connection of foundation drains to combined and partially separated sewers heightens the risk that the loadings on the system will exceed the available capacity. When this occurs, one of the results can be backups into residents' homes through basement plumbing fixtures, floor drains or cleanouts.

Neighbourhoods Under Review

Detailed investigations were carried out in 36 neighbourhoods to determine the cause of flooding and identify possible solutions. These neighbourhoods are identified in Annexes 1 and 2. Some of the neighbourhoods have experienced repeated basement flooding occurrences from a City sewer backup.

There are also isolated homes that flooded on September 9, 2004 that have experienced basement flooding. Due to the random locations, the Department considers these flooding occurrences related to service connection problems, internal plumbing deficiencies or local grading deficiencies and not as a result of a backup of the City’s sewer system. The Department sent letters to approximately 700 residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and determine the condition of the sewer connection and potential cause of basement flooding.

Results of Basement Flooding Review

A total of 36 neighbourhoods were identified where basement flooding occurred on September 9, 2004 as a result of a City sewer backup. Many of these neighbourhoods have experienced prior occurrences of basement flooding from City sewer backup. Since the September 9, 2004 event, staff have reviewed each neighbourhood in detail through a combination of flow monitoring, physical inspections, system modeling, operational reviews and reviews of previous investigations. While in each case the underlying cause pertains to overtaxing of the sanitary or combined sewer system during significant wet weather events, the factors limiting the ability to convey the additional flow is different in each neighbourhood. Therefore, there is not a “one size fits all” solution. One element that is consistent throughout is the benefit of removing stormwater from the sanitary system.

When evaluating each neighbourhood, the following level of service objectives were applied:

- For neighbourhoods serviced by combined sewers, the objective is to improve the level of protection to a 1 in 100 year event and no less than a 1 in 50 year event if the former is not achievable.

- For neighbourhoods serviced by partially separated systems (i.e. foundation drains connected to sanitary sewer), the objective is to eliminate to the extent possible the repeated occurrences of basement flooding from City sewer backups.

If the level of service cannot be feasibly achieved through the implementation of system level solutions (i.e. new sewers, improved sewer or drainage outlets, flow removal, etc), then in these isolated cases the recommended solution may involve improvements on an individual property basis, such as the installation of protective plumbing or hydraulically disconnecting basements from the gravity system. The City wouldextend provide the necessary fundingunder the Residential Protective Plumbing Program tocover implement100% of the required improvements.

Based on the investigations completed by the Department, the specific cause of basement flooding has been determined for 33 of 36 neighbourhoods. The remaining locations are subject to further investigations. Solutions or mitigating measures have been identified for implementation as part of the 2006 Draft Capital Budget in 26 of 36 neighbourhoods. Of the remaining 10 locations, 2 require an Environmental Assessment, 5 require detailed design and contract preparation and 3 require further investigations. Funding has been identified in the 2006 Draft Capital Budget to complete the additional engineering work prior to proceeding with construction in 2007 and beyond.

The detailed results of the investigations are summarized in Annexes 1 and 2. Annex 1 provides an overall financial summary and anticipated timelines of the proposed solutions. Annex 2 provides informationon the following key questions for each ward:on a ward-by-ward basis.

To what extent is this Ward affected by basement flooding from sewer backups?

1. What is the cause of repeated basement flooding in these areas?
2. What is the history of basement flooding in these areas?
3. What are the solutions to reduce the frequency of basement flooding occurrences?
4. How much will it cost to implement these solutions and when can these be done?

Ongoing Sewer Maintenance and Renewal Initiatives

Routine sewer cleaning and inspection is a key maintenance function to maximize the available capacity of the sewer system. For sanitary sewers, the Department is working towards a 5-year cycle with a number of locations identified as “hot spots” which are cleaned on an approximate 3-month cycle. These locations are more susceptible to debris and grease accumulation. For storm sewers, cleaning is undertaken as required. Since these are generally larger pipes that are periodically flushed during wet weather events and are not subject to grease accumulation, a routine cleaning cycle is not necessary.

For storm sewers, cleaning is undertaken as required. Since these are generally larger pipes that are periodically flushed during wet weather events and are not subject to grease accumulation, a routine cleaning cycle is not necessary.

Sewers in all neighbourhoods that experienced basement flooding as a result of the September 9, 2004 event have been cleaned and inspected.

The 2006 Draft Operating Budget will include recommendations to provide the necessary resources to ensure appropriate sewer maintenance is undertaken on an ongoing basis.

Capacity assessments, flow analysis, needs studies and network improvement recommendations are undertaken by the Department on an annual basis. City-wide network-level undertakings specific to flood mitigation such as extraneous flow removal programs, flow management, stormwater management strategies and demand management initiatives are continually being developed and implemented.

The City has ongoing sewer system renewal and rehabilitation programs. Whenever possible, all opportunities to incorporate capacity/flood mitigation into other construction activities are integrated within the projects' scope of work. In 2005, the Capital Budget allocated approximately $40 million to over 40 sewer improvement projects across the city, each of which helps improve the condition and capacity of the sewer systems.

Removing Stormwater from the Sanitary Sewer Systems

Through ongoing investigations, staff have identified a number of significant stormwater flow contributors to the sanitary system that can have an impact on basement flooding. These include wading pools, flat roofs from buildings, cross-connected catch basins, depressed driveways and perforated maintenance covers. Staff are working actively to remove these flow sources. For example, there is a coordinated effort between Infrastructure Services, Parks and Recreation and Real Property and Asset Management Branches to find ways of reducing theimpact of stormwater flow from wading pools on the sewer system. Staff are working with property management firms to remove stormwater flows from flat roofs, cross-connections, improper maintenance covers etc. to the sanitary sewer system.

Homeowners can also assist with improving the system capacity and reducing the risk of basement flooding due to sewer backups in a number of ways. One of the most effective means is the removal of unwanted stormwater from piped systems. Although, in isolation, one individual property's contribution might appear insignificant, downspouts from eavestroughs or foundation drains may be one of the causes of flooding of their basement, their neighbour's property or the properties downstream in the sewer system. In dealing with extraneous flows, every effort from individual property owners goes a long way towards overall system improvements.

To increase awareness, a brochure was developed and distributed to residents in neighbourhoods susceptible to basement flooding, to Client Service Centres and is posted on the City’s website (Annex 3). The brochure is a “checklist of tips” for homeowners to reduce flows from the sanitary system, such as:

- Direct eavestrough downspouts away from building foundations

- Ensure sump pump outlet discharges to the ground surface or storm drainage system and not to a laundry tub, floor drain or other sanitary plumbing fixtures

- Ensure lot is graded to drain away from the foundation

- Disconnect foundation drains and catch basin in depressed driveway from the sanitary system and redirect to either the ground surface by means of a sump pump or by gravity to a storm drainage system

Residential Flood Protection from City Sewer Backups

Modifications and improvements to the sewer system take time and significant capital investment. Property owners that are susceptible to basement flooding are encouraged to participate in the City’s Residential Protective Plumbing Program to improve their level of protection. As outlined in the program approved by Council on 26 April 2005, this generally requires the installation of approved backflow valves and flow reduction measures as outlined above.

To raise awareness for the program, a brochure was developed and distributed to residents in neighbourhoods susceptible to basement flooding (Annex 4), details have been posted on the City’s website and letters were sent to approximately 800 property owners that experienced basement flooding from City sewer backup on September 9, 2004. Since the September 9, 2004 event, the City has received over 300 applications for the Residential Protective Plumbing Program (as of September 30, 2005).

PUBLIC CONSULTATION

Since September 9, 2004, several consultation initiatives have been undertaken, such as:

- Staff attended8 public meetings 8 public meetings in various Wards more seriously impacted by the flooding event to provide information related to the basement flooding review.

- Basement flooding mitigation was identified as a priority in the City’s Corporate Plan. Public consultation was carried out as part of the approval process.

- Advisory committee meetings and open houses were held as part of Environmental Assessments undertaken in 2005 for Sandy Hill and O’Connor flooding investigations.

- The Department consulted with Councillors regarding basement flooding issues in their wards.

FINANCIAL IMPLICATIONS

The 2006 Draft Capital Budget will identify an estimated $22 million,360,000 to fund sewer system improvements related to basement flooding. In many instances these will be carried out as part of coordinated projects (e.g. road, water, sewer). The 2007 to 2010 preliminary capital requirements to address remaining sewer improvements are estimated at $22 million ,000,000 (based on current available information). Fundsare will be available in the Rate Supported Reserve Fund to cover these expenditures.

ATTACHMENTS

Annex 1 Overall Financial Summary

Annex 2 Basement Flooding Review - Ward Summaries

Annex 3 Help Yourself – Help Your Neighbour – Flow Removal Checklist

Annex 4 Residential Protective Plumbing – Grant Assistance Program

DISPOSITION

The Department of Public Works and Services will proceed with the implementation of sewer system improvements.

Annex 1

Overall Financial Summary

Ward	Neighbourhood	Scope of Solution(s)	Timelines for Implementation	Financial Requirements 2006*	Financial Requirements 2007 – 2010*	Comments
1	None identified			-	-
2	Chateau Neuf	Flooding attributed to internal plumbing issues	Letters sent to affected owners in 2005	-	-	City is working with homeowners to provide support to rectify problem
3	Lynwood Village	Protective plumbing – due to low number of affected properties	Letters sent to affected owners in 2005	-	-	Funding available from Residential Protective Plumbing Program (approx. $10,000)
4	Kanata North (Shirley’s Brook)	Modifications undertaken around the pumping station. Area is not considered susceptible to repeated occurrences		-	-	Information subject to Legal Services
4	Beaverbrook	Flooding attributed to internal plumbing issues	Letters sent to affected owners in 2005	-	-	City is working with homeowners to provide support to rectify problem
5	None identified			-	-
6	None identified			-	-
7	McKellar Heights	Sanitary sewer improvements and flow removal	2006, coordinated with Carling Ave	$2,000,000	-	To be coordinated with Glabar Park
7	Glabar Park	Sanitary sewer improvements and flow removal	2006, coordinated with Carling Ave	Included in McKellar Heights	-	To be coordinated with McKellar Heights
7	Carlingwood	Protective plumbing – due to low number of affected properties		-	-	Funding available from Residential Protective Plumbing Program (approx. $10,000)
7	Woodroffe	Increase reliability of the protective measures currently in place		-	-

Ward	Neighbourhood	Scope of Solution(s)	Timelines for Implementation	Financial Requirements 2006*	Financial Requirements 2007 – 2010*	Comments
8	St. Claire Gardens	Environmental Assessment (EA) required to confirm preferred solution	EA initiated in 2005 to be completed in 2006 for implementation to be considered starting in 2007	-	Subject to EA	Funding for EA covered in 2005 budget (approx. $200,000). Extent of solution will be know when EA is completed
8	Meadowlands	EA coordinated with St. Claire Gardens	Same as St. Claire Gardens	-	Subject to EA	The sewers from St. Claire Gardens drain through Meadowlands
8	Belair	Ongoing flow monitoring. Results required before confirming cause and solutions	Solution to be defined in early 2006	-	Subject to outcome of review	Some storm sewer repairs to be undertaken in 2006. Extend of solution to be defined once investigation is complete in early 2006.
9	Parkwood Hills	Sewer improvements	2006 – main line sewers 2007 and beyond – local sewers	$2,000,000	To be defined as part of annual renewal program	Improvements will also benefit CityView/Skyline
9	CityView/ Skyline	Sewer improvements coordinated with Parkwood Hills	Same as CityView/Skyline	Included in CityView/ Skyline	To be defined as part of annual renewal program
9	Fisher Heights	Sewer improvements	2006	$2,000,000	-	To be coordinated with improvements in Ward 16
10	South Keys (Viking/ Fernwood)	Improve storm outlet. Reconfigure backwater valves Modify pool drainage outlet.	2005-2006	$510,000 for storm outlet and pool drain improvements	-	Funding available from 2005 budget for backwater valves (approx. 30,000)
10	Southgate	Phase 2 of Sawmill Creek improvements.	2006	Funded through PGM	-

Ward	Neighbourhood	Scope of Solution(s)	Timelines for Implementation	Financial Requirements 2006*	Financial Requirements 2007 – 2010*	Comments
11	None identified			-
12	Sandy Hill	Provide storage and install new sewer on Somerset to handle storm flows	Design – 2006 Construction – 2007/2008	$500,000	$12,000,000	Capacity improvements in Rideau River Collector (as discussed in Ward 13) will also benefit Sandy Hill
13	Overbrook (Eve/Spartan/Fullerton)	Reconstruct portion of sanitary sewer to remove flow restriction	Design – 2005 Construction – 2006	$250,000	-
13	Overbrook (King George/ Queen Mary)	Capacity improvements to Rideau River Collector. Reconfigure local sewers to outlet into new Rideau River Collector (RRC)	RRC Construction – 2006/2007 Local Sewers, Design – 2006 Construction – 2007+	$8,500,00	$1,000,000	Improvements to Rideau River Collector will significantly benefit Sandy Hill and Rideau Gardens
13	Overbrook (Presland/ Renouf)	Still under investigation. RRC will improve conditions	Subject to outcome of review	-	Subject to outcome of review
14	Preston	Sewer reconstruction to improve flow conveyance	Design – 2006 Construction – 2007+	$800,000	$9,000,000	Improvements to the Brown’s Inlet area (as discussed in Ward 17) will also benefit Preston
14	O’Connor	Environmental Assessment to be completed in 2006	Design – 2006 Construction to be determined	$500,000	Subject to outcome of EA
15	Westboro	Sewer alarms and protective plumbing	2005/2006	$50,000	-	Funding available from Residential Protective Plumbing Program (approx. $15,000)
15	Champlain Park	Sewer alarms and protective plumbing	2005/2006	$50,000	-	Funding available from Residential Protective Plumbing Program (approx. $15,000)

Ward	Neighbourhood	Scope of Solution(s)	Timelines for Implementation	Financial Requirements 2006*	Financial Requirements 2007 – 2010*	Comments
16	Carlington (Chatelaine/ Raven)	Sewer improvements and flow removal	2006	$400,000	-
16	Carleton Heights (Val Marie)	Protective plumbing – due to low number of affected properties	Letters sent to affected owners in 2005	-	-	Funding available from Residential Protective Plumbing Program (less than $5,000)
16	Carleton Square (Dynes/Eiffel)	Sewer improvements and flow removal	2006	Included in Fisher Heights (Ward 9)	-
17	Rideau Gardens	Capacity improvements to Rideau River Collector	2006	Included in Overbrook (Ward 13)	To be defined as part of budget for local system improvements	Capacity improvements in Rideau River Collector (as discussed in Ward 13) will benefit Rideau Gardens and Sandy Hill
17	Brown’s Inlet	Sewer improvements and diversions	2003-2010+	-	Included in Preston (Ward 14)	Awaiting decision on Part 2 Order filed with the Minister of the Environment. Funds for detailed design and storm sewer construction are available from previous authority.
17	Riverview Park (San Remo)	Sewer improvements, flow removal and construction of a new pumping station	2006/2007	$1,000,000	-

Ward	Neighbourhood	Scope of Solution(s)	Timelines for Implementation	Financial Requirements 2006*	Financial Requirements 2007 – 2010*	Comments
18	Alta Vista (Chalmers)	Protective plumbing – due to low number of affected properties	Letters sent to affected owners in 2005	-	-	Funding available from Residential Protective Plumbing Program (approx. 30,000)
18	Alta Vista (Blossom/Utah)	Sewer improvements and flow removal	2006+	$1,200,000	To be defined as part of annual renewal program	Sewer outlet to be addressed in 2006 and ongoing renewal in future years
18	Faircrest Heights	Sewer improvements and flow removal	2006	$1,000,000	-
18	Elmvale/ Urbandale Acres	Solutions under review (to be finalized in early 2006)	Design – 2006 Construction – 2007+	-	To be defined in 2006	Design to be initiated in 2006.
18	Riverview Park (Drake)	Sewer improvements and flow removal	2006	$1,600,000	To be defined as part of annual renewal program	Sewer outlet to be addressed in 2006 and ongoing renewal in future years
18	Ridgemont	Sewer improvements and flow removal	2006+ linked to Bank Street	-	To be defined as part of Bank Street reconstruction	Design to be initiated in 2006 as part of Bank Street reconstruction
19	None identified			-	-
20	None identified			-	-
21	None identified			-	-
				$22,360,000	$22,000,000+

ANNEX 2

BASEMENT FLOODING REVIEW

SUMMARY OF INVESTIGATIONS WARD 1 ORLÉANS

To what extent is this Ward affected by basement flooding from sewer backups?

There are no areas in this Ward that have experienced repeated flooding as a result of a City sewer backup. There has been a prior occurrence of basement flooding in 1998 within the Queenswood Heights area resulting from a high intensity rainfall event that overwhelmed the storm sewer system and entered basements through basement openings (window wells) and eventually surcharged the sanitary system, but this has not been a repeated occurrence.

There are 30 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

Repeated flooding has not been experienced in this Ward. Properties in this Ward are all serviced by fully separated storm and sanitary sewer systems.

What is the history of repeated basement flooding in these areas?

With the exception of the basement floodings that occurred as a result of the heavy rainfall event of 1998, there is no history of areas that are subject to repeated flooding in this Ward.

What are the solutions to reduce the frequency of basement flooding occurrences?

Not applicable.

How much will it cost to implement these solutions and when can these be done?

Not applicable.

WARD 2 INNES

To what extent is this Ward affected by basement flooding from sewer backups?

There are no areas that have experienced repeated flooding as a result of a City sewer backup. On September 9, 2004, there is a small cluster of approximately 5 connected homes in the Chateau Neuf neighbourhood (Simard Street) that experienced basement flooding. The flooding for this area is attributed to an internal plumbing issue and the property owners have been advised accordingly in writing so that corrective works can be undertaken to prevent future floodings.

There are 28 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

Repeated flooding has not been experienced in this Ward. Properties in this Ward are largely serviced by separated storm and sanitary sewer systems.

What is the history of basement flooding in these areas?

There is no history of areas that are subject to repeated flooding in this Ward.

What are the solutions to reduce the frequency of basement flooding occurrences?

The City is working with the homeowners on Simard Street to provide information to rectify the internal plumbing problems.

How much will it cost to implement these solutions and when can these be done?

There is no cost to the City. The costs to correct the internal plumbing problems are the responsibility of the property owners.

WARD 3 BELL-SOUTH NEPEAN

To what extent is this Ward affected by basement flooding from sewer backups?

Lynwood Village has been the subject of basement flooding in the past, but this was addressed by the former City of Nepean in the 1990’s. There are no areas that are prone to repeated flooding as a result of a City sewer backup.

On September 9, 2004, there is a small cluster of approximately 7 homes in the Virgil Street area that experienced basement flooding. This flooding is attributed to a City sewer backup.

There are 63 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

Properties in this ward are largely serviced by separated storm and sanitary sewer systems. The basement of the homes in the Virgil Street area that experienced basement flooding on September 9, 2004 are at a lower elevation with respect to surrounding properties. The backup was the result of storm and/or groundwater inflow into the sanitary system that resulted from the long rainfall event. This has not been a recurring event.

What is the history of repeated basement flooding in these areas?

Lynwood Village has been the subject of basement flooding in the past, but this was addressed by the former City of Nepean in the 1990’s. There is no other history of repeated basement flooding in this Ward.

What are the solutions to reduce the frequency of basement flooding occurrences?

The most cost-effective means of protecting the small number of affected homes in the Virgil Street area that flooded on September 9, 2004 is through the Residential Protective Plumbing Program. The City has contacted the affected residents in writing to have protective plumbing installed.

The City will continue to monitor possible sources of water infiltration into the sanitary sewer system and have them removed since sanitary sewer systems in fully separated areas are designed only to convey domestic waste. The City will be renewing the infrastructure in the area in the long term and will be looking at upgrading the sanitary system at that time. This will further increase the level of protection against future sewer backups.

How much will it cost to implement these solutions and when can these be done?

The estimated cost to supply the affected homes with protective plumbing is approximately $10,000. This funding is available through the Residential Protective Plumbing Program. The works will be undertaken when the property owners provide the authorization to proceed (i.e. signed application through the program).

WARD 4 KANATA

To what extent is this Ward affected by basement flooding from sewer backups?

There are no neighbourhoods in this Ward that have experienced repeated flooding occurrences. The Glen Cairn area experienced flooding in 2002. Approximately 60 homes in the Kanata North area (Briarbrook/Shirley’s Brook) and Beaverbrook area (Varley Lane) reported flooding on September 9, 2004.

There are also 29 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

Repeated flooding has not been experienced in this Ward. Properties in this Ward are serviced by fully separated storm and sanitary sewer systems.

Glen Cairn

The cause of flooding and recommended improvements were identified as part of previous investigations. The drainage improvements have been underway since 2003 and should be completed in 2006 (final funding request is being identified in 2006 Draft Capital Budget).

Kanata North (Shirley’s Brook)

Basement flooding occurred when the March Road sanitary pumping station was put out-of-service when it experienced surface flooding. The cause of the surface flooding is under investigation and given the potential for litigation information is being managed through Legal Services.

Beaverbrook

The information reviewed suggests that the flooding occurrences for this area appear to be attributed to an internal plumbing issue. The property owners have been notified accordingly in writing so that corrective works can be undertaken to prevent future flooding occurrences.

What is the history of repeated basement flooding in these areas?

Notwithstanding the areas identified above, there is no history of areas that are subject to repeated flooding in this Ward.

What are the solutions to reduce the frequency of basement flooding occurrences?

Glen Cairn

As a result of the 2002 rainfall event, in 2003 the City initiated drainage improvements such as larger culverts and regrading of existing channel beds to improve surface drainage conditions. These improvements are continuing through 2006. This area performed very well during the September 9^th, 2004 rainfall event.

Kanata North (Shirley’s Brook)

As noted above, the September 9, 2004 flooding which affected the March Road sanitary pumping station is being reviewed through Legal Services. For additional protection, the City has built a berm around the pump station and worked with the developer to reinstate the conveyance of upstream storm flows through the stormwater management pond that will reduce the risk of this condition from reoccurring.

How much will it cost to implement these solutions and when can these be done?

Glen Cairn

It is expected that improvements in Glen Cairn will be completed in 2006. The estimated cost to undertake the required drainage improvements is $7,000,000.

Kanata North (Shirley’s Brook)

With the exception of the minimal costs associated with the berm around the March Road pumping station, no costs have been identified in relation to the Shirley’s Brook event.

Beaverbrook (Varley Lane)

There is no cost to the City. The costs to correct the internal plumbing problems are the responsibility of the property owners.

WARD 5 WEST CARLETON

To what extent is this Ward affected by basement flooding from sewer backups?

Only the Village of Carp is serviced by municipal sewers. There is no history of basement flooding as a result of City sewer backups.

What is the cause of repeated basement flooding in these areas?

Not applicable.

What is the history of repeated basement flooding in these areas?

There is no history of repeated basement flooding due to City sewer backups.

What are the solutions to reduce the frequency of basement flooding occurrences?

Not applicable.

How much will it cost to implement these solutions and when can these be done?

Not applicable.

WARD 6 GOULBOURN

To what extent is this Ward affected by basement flooding from sewer backups?

Only the Villages of Stittsville, Richmond and Munster Hamlet are serviced by municipal sewers. There is no history of repeated basement flooding as a result of City sewer backups.

There are 6 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

Not applicable.

What is the history of repeated basement flooding in these areas?

There is no history of repeated basement flooding due to City sewer backups.

What are the solutions to reduce the frequency of basement flooding occurrences?

Not applicable.

How much will it cost to implement these solutions and when can these be done?

Not applicable.

WARD 7 BAY

To what extent is this Ward affected by basement flooding from sewer backups?

There are 4 neighbourhoods in this Ward that experienced basement flooding on September 9, 2004, including McKellar Heights, Glabar Park, Carlingwood and Woodroffe. Approximately 35 homes reported basement flooding in these neighbourhoods on September 9, 2004.

There are also 65 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

Sewers within this ward are partially separated. The sanitary sewer system operates adequately during dry weather conditions, but during extreme wet weather conditions the additional flow contribution from connected foundation drains and depressed driveways contributes significant quantities of stormwater that can result in basement flooding.

McKellar Heights and Glabar Park

The sewers for the McKellar Heights and Glabar Park neighbourhoods outlet at Carling Avenue. Investigations have revealed that the sanitary sewer on Carling Avenue has limited capacity to handle the additional wet weather flows from the foundation drains, depressed driveways and flat roofs. The additional flow can cause the sewer on Carling Avenue to exceed its capacity and this causes flows to backup within the McKellar Heights and Glabar Park sewers leading to incidents of basement flooding.

Carlingwood

There are several factors that contribute to the homes flooding in the Carlingwood neighbourhood. The Ancaster Avenue sewers drain to sewers on Byron Avenue, and these are susceptible to grease build-up. The grease build-up can create a flow restriction within the Byron Avenue sewer and back up flows within the Ancaster Avenue sewer. While the grease build-up is controlled by frequent sewer cleaning, during extreme wet weather conditions the additional flow from the foundation drains, flat roofs and depressed driveways can lead to basement flooding occurrences.

Woodroffe

There are homes with relatively low basement elevations within the Woodroffe (Pooler) neighbourhood that experienced flooding as a result of surcharging of the West Nepean Collector. The West Nepean Collector is a major sewer outlet serving the west end of the City. During extreme wet weather events the West Nepean Collector’s capacity can be exceeded. When this occurs, the water level in the sewer can rise above some of the lower basement elevations resulting in flooding occurrences. This condition occurred on September 9, 2004 resulting in basement flooding.

Subsequent to previous basement flooding occurrences, protective measures where implemented, such as the installation of a pumping station and an overflow to protect from high water levels in the West Nepean Collector sewer. Unfortunately, the September 9, 2004 flow conditions affected the operation system causing the sanitary sewer in the Woodroffe (Pooler) neighbourhood to exceed its capacity resulting in basement flooding occurrences.

What is the history of basement flooding in these areas?

The properties in McKellar Heights (Killeen) have experienced flooding in 1986 and 1988.

What are the solutions to reduce the frequency of basement flooding occurrences?

McKellar Heights and Glabar Park

Carling Avenue from Woodroffe Avenue to Kirkwood Avenue and the water and sewer infrastructures have been identified for renewal. Design was initiated in 2005 and will be completed once the Environmental Assessment for the LRT corridor has been completed in 2006.

As part of the renewal works, there is an opportunity to coordinate sewer improvements that will increase the capacity and help reduce the incidents of basement flooding. Also, removal of storm connections from the sanitary system will also be undertaken in the neighbourhood with a focus on large flat roofs.

Carlingwood

The most cost-effective means of protecting the small number of affected homes in this neighbourhood that flooded on September 9, 2004 is through the Residential Protective Plumbing Program. The Department has contacted the affected residents to have protective plumbing installed. In the short term, the Department will continue to seek opportunities to remove storm flows from the sanitary system. Sewers in this area are also on a frequent cleaning program that will assist in dealing with the potential grease accumulation. In the longer term, the Department will be renewing the infrastructure and looking for opportunities to improve the capacity of the system.

Woodroffe

The Department has initiated procedures to increase the reliability of the protective measures currently in place in order to increase the level of protection from future basement flooding.

As an addition level of protection, affected residents are encouraged to access the Residential Protective Plumbing Grant Program. Residents who have reported flooding on September 9, 2004 have received earlier this year a letter from the City encouraging them to take advantage of the grant program.

How much will it cost to implement these solutions and when can these be done?

Glabar Park and McKellar Heights

The estimated cost for the sanitary sewer system improvements on Carling Avenue and the flow removal initiatives is $2,000,000. This has been identified in the 2006 Draft Capital Budget for design and construction in 2006.

Carlingwood

The estimated cost for providing protective plumbing for affected properties in this neighbourhood is $10,000. Funds are available in the 2005 Residential Protective Plumbing Program.

WARD 8 BASELINE

To what extent is this Ward affected by basement flooding from sewer backups?

There are 3 neighbourhoods in this Ward that experienced basement flooding on September 9, 2004, including St. Claire Gardens, Meadowlands, and Bel-Air. Approximately 157 homes reported basement flooding in these neighbourhoods on September 9, 2004.

There are also 103 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

Sewers within this ward are partially separated. The sanitary sewer system operates adequately during dry weather conditions, but during extreme wet weather conditions the additional flow contribution from connected foundation drains and depressed driveways contributes significant quantities of stormwater that can result in basement flooding.

Bel-Air

There are several factors that have been identified as contributing to homes flooding in this neighbourhood. These include inflow of storm and ground water into the sanitary system from downspouts from eavestroughs draining along the foundation or imbedded in the ground, foundation drains connected to the sanitary sewer and aging pipes. There are also sewer configuration issues near the Queensway that require further assessment to determine if this could have been a contributing factor in the flooding. Ongoing flow monitoring will provide information to support this assessment. More details on the specific cause of flooding will be known when this information will be available in early 2006.

St. Claire Gardens

There are several factors that have contributed to basement flooding in the St. Claire Gardens area. In terms of the configuration of the drainage systems, sanitary flows are conveyed by sanitary sewers and a ditch system conveys storm drainage. Over the years, the surface drainage system has been compromised and there are several storm connections to the sanitary system, such as downspouts discharging at or near the foundation, foundation drains outleting into the sanitary system via sump pump connections and some catch basin connections at the bottom of depressed driveways. The sanitary sewers are also showing signs of aging. The combination of aging pipes that allow groundwater to infiltrate and the presence of storm inflow into the sanitary system cause flows in the sanitary system to increase during significant wet weather events leading to basement flooding occurrences.

Meadowlands

The sanitary sewers from the St. Claire Gardens area drain through the sewers in the Meadowlands area. The volume of wet weather flow through the area causes the local system to backup. The main sewer outlet for Meadowlands is the Viewmount Collector. In addition to the issues identified in the St. Claire Gardens area, there are also outlet configuration issues with the Viewmount Collector that could have contributed to the flooding occurrences.

What is the history of basement flooding in these areas?

The Bel-Air cluster experienced minor flooding in 1986. There are no historical records of flooding available for Meadowlands and St. Claire Gardens.

What are the solutions to reduce the frequency of basement flooding occurrences?

Bel-Air

The City is conducting flow monitoring in the Bel-Air neighbourhood to quantify flows within the Woodroffe Collector. The flow monitoring will be continuous over a period of time which will include wet weather events. The data provided from the flow monitoring will provide valuable feedback on how the system functions. Solutions to remediate flooding in the area will be dependant on the monitoring. This is expected to be completed in early 2006.

St. Claire Gardens and Meadowlands

The Department is initiating an Environmental Assessment (EA) Study to resolve the deficient storm drainage issues in St. Claire Gardens neighbourhood and this will extend into the Meadowlands area. The study will identify alternatives to address the deficient storm drainage system and a strategy for removing storm flows from the sanitary system. The EA will provide an opportunity for the community to be involved in the development of solutions and a Public Advisory Committee (PAC) will be established to provide support for the process.

How much will it cost to implement these solutions and when can these be done?

Bel-Air

Costs to implement solutions are not defined at this time. These will be defined once the flow monitoring and assessment is complete in early 2006.

St. Claire Gardens and Meadowlands

The EA is being initiated in the fall of 2005 with completion expected in 2006. The cost is estimated at $200,000 and has been funded from the 2005 capital budget. Once the preferred solution has been identified, costs will then be quantified and identified as part of a future capital budget.

WARD 9 KNOXDALE-MERIVALE

To what extent is this Ward affected by basement flooding from sewer backups?

There are 3 neighbourhoods in this Ward that experienced basement flooding on September 9, 2004, including CityView/Skyline, Parkwood Hills and Fisher Heights. Approximately 124 homes reported basement flooding in these neighbourhoods on September 9, 2004.

There are also 43 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

Sewers within this ward are partially separated. The sanitary sewer system operates adequately during dry weather conditions, but during extreme wet weather conditions the additional flow contribution from connected foundation drains and depressed driveways contributes significant quantities of stormwater that can result in basement flooding.

Parkwood Hills and Cityview/Skyline

There are numerous structural and hydraulic constraints in both the sanitary and storm sewer systems. Throughout the entire neighbourhood the sewers are overtaxed by the quantity of sewage generated. The sewers require frequent maintenance to remove grease and debris released into the system. There are also several inflow sourced into the sanitary system, such as foundation drains and eavestroughs outleting at or near the foundation.

Fisher Heights

There are several contributing factors that resulted in basement flooding. The partially separated nature of the sanitary sewer network causes significant rise in sanitary flows during wet weather events. The Fisher Heights sewer outlet into sewers on Fisher Ave and the Fisher Ave sewers are overtaxed and are prone to grease build-up (grease accumulation can reduce the capacity of the sewer to convey flows).

What is the history of basement flooding in these areas?

There are no historical records of flooding available for these neighbourhoods.

What are the solutions to reduce the frequency of basement flooding occurrences?

Parkwood Hills and Cityview/Skyline

Improvements are required to the main line sanitary sewer in order to improve the capacity of the system during wet weather events. This includes reconstructing the sewers on Inverness, Meadowlands, Beaver Ridge and Buffalo Circle.

The local sewers in these neighbourhoods are also showing signs of aging and will need to be replaced as part of the City’s annual renewal program.

Fisher Heights

Improvements are required to improve the sewer outlets in this neighbourhood. This includes renewing the sanitary sewer on Malibu and Fisher. It also includes realigning the sewer from Deer Park to cross Fisher and outlet on Dynes. This will eliminate the need for a sewer easement between Deer Park and Hilliard. This work will be coordinated with sewer improvements planned in Carleton Square (Ward 16).

How much will it cost to implement these solutions and when can these be done?

Parkwood Hills and CityView/Skyline

Starting in 2006 the City will be reconstructing the sewers along Inverness, Meadowlands, Beaver Ridge and Buffalo Circle to improve the level of service. Further improvements to the sanitary network will be phased in future years. The storm sewer network will also be upgraded starting in 2006 and continuing in future years.

The estimated cost for sewer improvements is $2,000,000. These works will be coordinated with watermain replacement and road reconstruction. This has been identified in the 2006 Draft Capital Budget for implementation in 2006. Funding for additional improvements will be made in future years.

Fisher Heights

The estimated cost for sewer improvements is $2,000,000. These works will be coordinated with watermain replacement and road reconstruction. This has been identified in the 2006 Draft Capital Budget for implementation in 2006. Sewer improvements will be coordinated with works planned in Ward 16.

WARD 10 GLOUCESTER-SOUTHGATE

To what extent is this Ward affected by basement flooding from sewer backups?

There are 2 neighbourhoods in this Ward that experienced basement flooding on September 9, 2004, including South Keys (Viking/Fernwood) and Southgate. Approximately 30 homes reported basement flooding in these neighbourhoods on September 9, 2004.

There are also 36 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

South Keys (Viking/Fernwood)

This area is serviced by fully separated storm and sanitary sewer systems. There are several contributing factors that caused flooding in this area:

- There are openings in the basement floor around the backwater valves for the foundation drains. During the rainfall event, the groundwater levels rose dramatically and eventually entered basements through these floor openings. Once in the basement the water exited via the sanitary floor drain thus becoming an extra source of flow in the sanitary sewer system.

- The main storm sewer outleting into Sawmill Creek is partly submerged which makes it susceptible to debris accumulation.

- The swimming pool on Pebble Road is connected to the sanitary sewer and this can increase the flow in the system during rainfall events.

Southgate

Sawmill Creek was running abnormally high during the rainfall event of September 9^th, 2004. The levels in the creek were above the banks and flooded the properties in the townhouse complex on Southgate.

What is the history of basement flooding in these areas?

The South Keys (Viking/Fernwood) area experienced flooding in August 1992.

What are the solutions to reduce the frequency of basement flooding occurrences?

South Keys (Viking/Fernwood)

The homes that flooded on Viking and Fernwood require reconfiguration of the storm backwater valves to prevent water from entering the basements and flooding the sanitary system. Letters were recently sent to affected residents with an offer to replace the backwater valves and seal the basement floor around the valves to prevent the water from rising in the basements.

The connection to the sanitary system of the swimming pool on Pebble Road will be reconfigured in such a way to significantly reduce the amount of flow contributing to the sanitary system. This will be completed in 2006.

The storm sewer outlet in Sawmill Creek needs to be reconfigured to improve conveyance.

Southgate

There are existing plans exist to divert the flows in Sawmill Creek upstream of the townhouse complex on Southgate. The diversion is to be completed in 2006 and it will significantly reduce the amount of water flowing through the existing channel thereby reducing the risk of the water overtopping the creek banks and flooding the surrounding properties.

How much will it cost to implement these solutions and when can these be done?

South Keys (Viking/Fernwood)

The modifications to the backwater valves and open pits on Viking/Fernwood are estimated to cost $30,000. Reconfiguring the swimming pool outlet is estimated to cost $10,000. Both are being funded through provisions in the 2005 capital budget related to flow removal.

Reconfiguring the storm outlet into Sawmill Creek is estimated at $500,000. This has been identified in the 2006 Draft Capital Budget for implementation in 2006.

Southgate

Phase 2 of the Sawmill Creek channel improvements are planned for 2006. Funding was identified in the 2005 Capital Budget by the Planning and Growth Management Department.

WARD 11 BEACON HILL-CYRVILLE

To what extent is this Ward affected by basement flooding from sewer backups?

There are 17 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

Repeated flooding has not been experienced in this Ward. Properties in this Ward are largely serviced by fully separated storm and sanitary sewer systems.

What is the history of basement flooding in these areas?

There is no history of areas that are subject to repeated flooding in this Ward.

What are the solutions to reduce the frequency of basement flooding occurrences?

Not applicable.

How much will it cost to implement these solutions and when can these be done?

Not applicable.

WARD 12 RIDEAU-VANIER

To what extent is this Ward affected by basement flooding from sewer backups?

The Sandy Hill neighbourhood experienced basement flooding on September 9, 2004. Over 40 homes reported flooding after this event, however based on feedback from the community it is the number of properties that experienced basement flooding is higher, but were not reported to the City.

What is the cause of repeated basement flooding in these areas?

The Sandy Hill area is serviced by a combined sewer outlet. There are several streets that have separate storm and sanitary sewers, however the pipes outlet into a single combined sewer pipe on Somerset Street. The Somerset Street sewer drains into the Rideau River Collector, which has a history of surcharging during significant rainfall events.

The Rideau River Collector receives flows from a large partially separated sewer system and during large rainfall events the contribution from foundation drains and other stormwater inflow sources causes the sewage levels to rise significantly. High levels of sewage in the Rideau River Collector prevent flows from the Somerset Street sewer from discharging freely thus causing the sewer system in Sandy Hill to backup.

In addition, the topography of the Sandy Hill area can be described as a “bowl” - the elevation of many streets within Sandy Hill are low with no natural outlet for storm sewers or overland flow. Storm sewers discharge to the combined trunk sewer on Somerset Street instead of the Rideau River. This can cause the sewer to surcharge during high intensity rainfall events. The “bowl” effect also causes the surface accumulation of large volumes of stormwater in low-lying areas creating a risk of surface flooding.

What is the history of basement flooding in these areas?

Many homes in Sandy Hill have flooded as a result of significant rainfall events in 1996, 1988, 1986 and on many other occasions.

What are the solutions to reduce the frequency of basement flooding occurrences?

In 2006, the City is proceeding with the construction of the twinning of the Rideau River Collector along North River Road. This will relieve the outlet for the Somerset Street sewer allowing it to drain freely and will result in an increase in level of protection for Sandy Hill (in addition to Overbrook and Rideau Gardens).

In addition, an Environmental Assessment was undertaken in 2005 to identify options to handle storm flows in Sandy Hill. The preferred alternative includes the construction of a large underground reservoir to temporarily store combined sewer flows when the capacity of the Somerset Trunk sewer is exceeded, thus preventing the combined system from surcharging. Sandy Hill Park will also be depressed to act as a stormwater management pond to store excess surface runoff that accumulates in the low-lying areas. The accumulated volumes in the storage facilities will then drain back to the combined system at a controlled rate after the rainfall event.

Since these improvements will take time to implement, residents are encouraged to participate in the Residential Protective Plumbing Program.

How much will it cost to implement these solutions and when can these be done?

The cost of the preferred alternative identified in the EA study is approximately $12,000,000. Design of the preferred alternative will be undertaken in 2006 at a cost of $500,000 and is identified in the 2006 Draft Capital Budget. Funding for construction will be identified in the 2007 budget and scheduling for the construction will be identified at that time.

WARD 13 RIDEAU-ROCKLIFFE

To what extent is this Ward affected by basement flooding from sewer backups?

There are 3 areas in the Overbrook neighbourhood that experienced basement flooding on September 9, 2004, including Eve/Spartan/Fullerton, King George/Queen Mary and Presland/Renouf. Approximately 45 homes reported basement flooding in these areas on September 9, 2004.

There are also 44 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

Sewers within this ward are partially separated. The sanitary sewer system operates adequately during dry weather conditions, but during extreme wet weather conditions the additional flow contribution from connected foundation drains and depressed driveways contributes significant quantities of stormwater that can result in basement flooding.

Eve/Spartan/Fullerton

There is a depression in the sanitary sewer at the corner of Donald Street and Eve Street. During dry weather conditions, this depression is not sufficient to cause flooding problems. However, when foundation drains and depressed driveways contribute significant flows during large rainfall events, the depression creates a flow restriction that can lead to surcharging of the system and resulting basement flooding occurrences.

King George/Queen Mary

This area is under the influence of the Rideau River Collector. During extreme wet weather events, the sewage levels can rise significantly in the Rideau River Collector. This can restrict flows from the King George and Queen Mary areas from discharging properly causing the sanitary sewer system to backup. There are also flow removal opportunities and local sewer improvements that are required to further reduce the risk of basement flooding.

Presland/Renouf

This area is still under investigation. There are several factors that contributed to basement flooding in this area. The are sewer configuration issues that are still being investigated. It is also possible that this area is influenced by the Rideau River Collector. If this is confirmed, then the improvements to the Rideau River Collector will also benefit this area. This will be confirmed by late 2005/early 2006.

What is the history of basement flooding in these areas?

The Overbrook neighbourhood experienced flooding in 1986 and 1996.

What are the solutions to reduce the frequency of basement flooding occurrences?

Eve/Spartan/Fullerton

Basement flooding in this area will be addressed by reconstructing the sewers on Donald and Eve to remove the depression that will improve the capacity of the system.

King George/Queen Mary

Basement flooding in this area will be addressed by the partial twinning of the Rideau River Collector.

When the new collector is in place, construction of the local sewers on Queen Mary and King George will be undertaken to resolve local sewer deficiencies. Flow removal opportunities will also be undertaken at that time to remove flow sources such as wading pools and depressed laneways.

Presland/Renouf

Solutions are still being investigated. The twinning of the Rideau River Collector will likely have a positive influence.

How much will it cost to implement these solutions and when can these be done?

Eve/Spartan/Fullerton

The estimated cost for sewer improvements is $250,000. This has been identified in the 2006 Draft Capital Budget for implementation in 2006.

King George/Queen Mary

The estimated cost of the twinning of the Rideau River Collector is $8,500,000. This will be undertaken as part of coordinated works (i.e. road, water and sewer renewal). This has been identified in the 2006 Draft Capital Budget for implementation in 2006.

Local sewer improvements on King George and Queen Mary are estimated at $1,000,000. These will be undertaken as part of coordinated works (i.e. road, water and sewer renewal). Design has been identified in the 2006 Draft Capital Budget. Funding for construction will be identified in the 2007 budget.

Presland/Renouf

Estimated costs and timelines will be identified when investigation is complete in early 2006.

WARD 14 SOMERSET

To what extent is this Ward affected by basement flooding from sewer backups?

The area along Preston Street experienced basement flooding on September 9, 2004. Approximately 52 homes reported basement flooding in these neighbourhoods on September 9, 2004.

Although the O’Connor area did not suffer widespread flooding during the September 9th, 2004 event, it is an area that has been subjected to multiple basement flooding occurrences in the past.

There are also 61 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

The Preston Street and O’Connor areas are serviced by a combined sewer system. Previous investigations have found the sewers in these neighbourhoods have limited capacity and experience surcharge on a frequent basis during wet weather events. There is currently no flow restrictions on the amount of water that enters the sewer during wet weather events and this is leading to basement flooding occurrences.

What is the history of basement flooding in these areas?

There are a small number of properties along Preston Street (less than 10) that have experienced basement flooding on a frequent basis (every 5 years or so). More properties were impacted by the 1996 extreme rainfall event. The O’Connor area experienced widespread basement flooding in 1996 and more limited flooding as a result of previous occurrences.

What are the solutions to reduce the frequency of basement flooding occurrences?

Preston Street

This area, including Brown’s Inlet that drains through the Preston Street trunk sewer, was the subject of an Environmental Assessment (EA) in 2003/2004. The EA identified a preferred solution consisting of limiting the amount of storm runoff that enters the combined sewer system by using inlet restrictors in the catch basins and conveying the overland flow to various outlets. The intent is to keep the water on the surface and to convey it to various outlets instead of surcharging the combined sewer and causing basement flooding. This approach would maintain the existing 100-year old brick sewer. It would provide a 25-year level of protection against basement flooding for the properties along Preston Street (with the exception of 10 low lying properties that would require protective plumbing) and up to a 100-year level of protection for properties along the secondary sewer system (i.e. sewers from side streets outleting into the Preston Street sewer.

In 2005, other infrastructure renewal needs were identified along Preston Street that changed the previously identified preferred solution. To improve the reliability of the water system, the existing watermain along Preston Street needs to be replaced and increased in size. This will result in significant impacts to the 100-year old brick sewer. As a result, it is now proposed to replace the old brick sewer and lower the combined sewer on Preston Street. The flow restriction measures will also be implemented.

O’Connor

This neighbourhood is going through an Environmental Assessment (EA). Public consultation is occurring as part of this process. The EA will assist in defining a preferred solution. The EA will be completed in early 2006.

How much will it cost to implement these solutions and when can these be done?

Preston

The sewer system improvements are estimated to cost $9,000,000 and this will be undertaken as part of a coordinated project (i.e. road, water and sewer renewal; streetscaping improvements). Funding for design has been identified as part of the 2006 Draft Capital Budget. Funding for the first phase of construction will be identified as part of the 2007 budget.

O’Connor

Design of the preferred alternative will be undertaken in 2006 at a cost of $500,000 and this is identified in the 2006 Draft Capital Budget. Funding for construction will be identified in future budgets.

WARD 15 KITCHISSIPPI

To what extent is this Ward affected by basement flooding from sewer backups?

There are 2 neighbourhoods in this Ward that experienced basement flooding on September 9, 2004, including Westboro and Champlain Park. Approximately 27 homes reported basement flooding in these neighbourhoods on September 9, 2004.

There are 85 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

The West Nepean Collector serves as a major sanitary sewer outlet in this Ward. The majority of sewers within this area are partially separated. The sanitary sewer system operates adequately during dry weather conditions, but during extreme wet weather conditions the additional flow from connected foundation drains and depressed driveways contributes significant quantities of stormwater.

The homes that experienced flooding within both neighbourhoods have basement elevations that are at a lower elevation relative to other homes in the area. The elevation of the West Nepean Collector is close to these homes. During extreme wet weather events, sewage levels can rise dramatically in the West Nepean Collector and can lead to incidents of basement flooding.

What is the history of basement flooding in these areas?

Homes in these neighbourhoods have experienced basement flooding in 1986, 1988 and 1996.

What are the solutions to reduce the frequency of basement flooding occurrences?

To protect homes that are at risk of basement flooding from the level of sewage in the West Nepean Collector during extreme wet weather events, it is recommended that protective plumbing be installed.

In terms of modifications to the sewer system, a sewer alarm will be installed in both neighbourhoods to warn operations staff when the water level in the sanitary system rises to a critical level. If the alarm is activated, staff could be deployed to initiate emergency by-pass pumping that could reduce the extent of basement flooding.

How much will it cost to implement these solutions and when can these be done?

The estimated cost for providing protective plumbing for affected properties in these neighbourhoods is $30,000. Funds are available in the 2005 Residential Protective Plumbing Program.

Implementing the sewer alarms is estimated at $100,000. This has been identified in the 2006 Draft Capital Budget for implementation in 2006.

WARD 16 RIVER

To what extent is this Ward affected by basement flooding from sewer backups?

There are 3 neighbourhoods in this Ward that experienced basement flooding on September 9, 2004, including Carlington (Chatelaine/Raven), Carleton Heights (Val Marie) and Carleton Square (Dynes/Eiffel). Approximately 53 homes reported basement flooding in these neighbourhoods on September 9, 2004.

There are also 61 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

The majority of sewers within this ward are partially separated. The sanitary sewer system operates adequately during dry weather conditions, but during extreme wet weather conditions the additional flow contribution from connected foundation drains and depressed driveways contributes significant quantities of stormwater that can result in basement flooding.

Carlington (Chatelaine/Raven)

The partially separated nature of the sanitary sewer network causes significant rise in flows during wet weather events. The sewers in the neighbourhood are also showing signs of aging. The combination of higher stormwater flows and aging pipes contributed to basement flooding.

Carleton Heights (Val Marie)

The partially separated nature of the sanitary sewer network causes significant rise in flows during wet weather events. This was the main cause of basement flooding in this neighbourhood. Very few homes experienced basement flooding on September 9, 2004.

Carleton Square (Dynes/Eiffel)

The partially separated nature of the sanitary sewer network causes significant rise in flows during wet weather events. The sewers on Dynes accumulate grease and debris and require frequent cleaning. There is also a swimming pool on Eiffel that is connected to the sanitary sewer and contributes significant quantities of stormwater during wet weather events. These conditions led to exceeding the capacity of the sanitary sewer.

What is the history of basement flooding in these areas?

These neighbourhoods have not experienced significant flooding in the past.

What are the solutions to reduce the frequency of basement flooding occurrences?

Carlington (Chatelaine/Raven)

Sanitary sewer improvements are required along Cavan and Chatelaine to improve the outlet conditions. Flow removal from depressed driveways and wading pools is also required in order to reduce stormwater inflow into the system.

Carleton Heights (Val Marie)

The sewer on Val Marie is aging and will be replaced in the long term as part of coordinated infrastructure needs (i.e. road, water and sewer). Due to the low number of affected properties, letters will be sent to the homeowners offering them to install protective plumbing.

Carleton Square (Dynes/Eiffel)

Sewer improvements are required on Claymore and Dynes. Flow removal from depressed driveways and wading pools is also required in order to reduce stormwater inflow into the system.

How much will it cost to implement these solutions and when can these be done?

Carlington (Chatelaine/Raven)

The estimated cost for sewer improvements is $400,000. These works will be coordinated with watermain replacement and road reconstruction. This has been identified in the 2006 Draft Capital Budget for implementation in 2006.

Carleton Heights (Val Marie)

The estimated cost for providing protective plumbing for affected properties in this neighbourhood is less than $5,000. Funds are available in the 2005 Residential Protective Plumbing Program.

Sewer improvements will be undertaken in the long term as part of coordinated road, water and sewer infrastructure needs.

Carleton Square (Dynes/Eiffel)

The estimated cost for sewer improvements is included in the $2,000,000 identified for the Fisher Heights area (Ward 9). These works will be coordinated with watermain replacement and road reconstruction. This has been identified in the 2006 Draft Capital Budget for implementation in 2006.

WARD 17 CAPITAL

To what extent is this Ward affected by basement flooding from sewer backups?

There are 4 neighbourhoods in this Ward that experienced basement flooding on September 9, 2004, including Rideau Gardens, Brown’s Inlet and Riverview Park (San Remo). Approximately 80 homes reported basement flooding in these neighbourhoods on September 9, 2004.

Although the O’Connor area did not suffer widespread flooding during the September 9th, 2004 event, it is an area that has been subjected to multiple basement floodings in the past. O’Connor is discussed in Ward 14.

There are also 33 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

With the exception of Brown’s Inlet that is serviced by combined sewers, sewers in this ward are partially separated. The sanitary sewer system operates adequately during dry weather conditions, but during extreme wet weather conditions the additional flow contribution from connected foundation drains, flat roofs and depressed driveways contributes significant quantities of stormwater that can result in basement flooding.

Rideau Gardens

The main outlet sewer for this neighbourhood is the Rideau River Interceptor sewer. The Rideau River Interceptor drains into the Rideau River Collector. The majority of the areas that drain into the Rideau River Collector are partially separated. As a result, during extreme wet weather events the sewage levels can rise significantly in the Rideau River Collector. High levels in the Rideau River Collector prevent flows from the Rideau River Interceptor sewer from discharging freely causing the sewer system in Rideau Gardens to backup. The local sewers in Rideau Gardens are starting show signs of aging and require frequent cleaning.

Brown’s Inlet

This area is serviced by combined sewers and is part of the Preston Street Drainage area (combined with Ward 14). All storm and sanitary connections are connected to the same sewer network. The flooding in the Brown’s Inlet area is attributed to capacity constraints along the trunk combined sewer. A 2003 study found that this sewer currently has limited capacity and experiences surcharge on a regular basis.

Riverview Park (San Remo)

The sanitary sewer for this area drains to the Rideau River Collector. During extreme wet weather events, the sewage levels rise significantly in the Rideau River Collector. High levels in the Rideau River Collector prevent the flows from San Remo from discharging properly causing the sanitary sewer system to backup.

What is the history of basement flooding in these areas?

Rideau Gardens

Homes in this area experienced flooding in 1993, 1995 and 1996.

Brown’s Inlet

This area experienced widespread flooding in 1996 and a small number of properties on a frequent basis.

Riverview Park (San Remo)

This area experienced widespread flooding in 1996 and on previous occasions.

What are the solutions to reduce the frequency of basement flooding occurrences?

Rideau Gardens

In 2006, the City is proceeding with the twinning of the Rideau River Collector along North River Road. The proposed improvements will relieve the outlet for the Rideau River Interceptor sewer and the local sewers reducing the risk of basement flooding. Improvements in Sandy Hill will also benefit this area by further improving the sewer outlet conditions. The local sewers will be rehabilitated as part of the City’s ongoing infrastructure renewal program.

Browns Inlet

The solution for Browns Inlet was identified in a 2003 study as part of the Preston Street drainage basin (combined with Ward 14). The solution consists of restricting stormwater from entering the system and constructing a new storm sewer outelting into Brown’s Inlet.

Riverview Park (San Remo)

The solution includes a combination of sanitary sewer improvements near the outlet and a new pumping station. The pumping station will allow this area to be disconnected from the Rideau River Collector. Flows from the San Remo area will outlet into the pumping station. The pumping station will pump into the Rideau River Collector. As a result, if the level rises in the Rideau River Collector, it will not backup into the sewer on San Remo and cause basement flooding. Flow removal initiatives will also be undertaken to reduce the amount of stormwater entering the sanitary sewer system.

How much will it cost to implement these solutions and when can these be done?

Rideau Garden

The costs for improvements that will benefit this neighbourhood have been identified in Ward 13 (twinning of the Rideau River Collector) and Ward 12 (Sandy Hill drainage improvements).

Brown Inlet

The City is awaiting a decision from the Minister of Environment on a Part 2 Order request before proceeding. If the request is denied, then construction of the new storm sewer would be initiated in 2006. Funding for construction has been allocated in previous budgets.

Riverview Park (San Remo)

The estimated cost for the sewer improvements and new pumping station is $1,000,000. This has been identified in the 2006 Draft Capital Budget for design and construction in 2006.

WARD 18 ALTA VISTA

To what extent is this Ward affected by basement flooding from sewer backups?

There are 6 neighbourhoods in this Ward that experienced basement flooding on September 9, 2004, including Alta Vista (Chalmers), Alta Vista (Blossom/Utah), Faircrest Heights, Elmvale Acres/Urbandale Acres, Riverview Park (Drake) and Ridgemont. Approximately 140 homes reported basement flooding in these neighbourhoods on September 9, 2004.

There are also 120 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

Alta Vista (Chalmers)

The sewers in this neighbourhood are separated. The largest contributing factor to the flooding of the Chalmers area is the level of sewage in the Rideau River Collector. The Chalmers sewer drains directly into the Rideau River Collector. During extreme wet weather events, the sewage levels can rise significantly in the Rideau River Collector. The elevation of the basements that flooded on Chalmers is lower than the level of sewage in the Rideau River Collector during extreme wet weather events.

Alta Vista (Blossom/Utah), Faircrest Heights, Elmvale Acres/Urbandale Acres, Riverview Park (Drake) and Ridgemont

The sewers in these neighbourhoods are partially separated and are aging. The sanitary sewer system operates adequately during dry weather conditions, but during extreme wet weather conditions the additional flow contribution from connected foundation drains, flat roofs and depressed driveways contribute significant quantities of stormwater that can result in basement flooding. The groundwater level in these neighbourhoods is very high increasing the problems associated with stormwater inflow into the sanitary sewer system.

What is the history of basement flooding in these areas?

These neighbourhoods have experienced repeated flooding in 1986, 1988 and 1996.

What are the solutions to reduce the frequency of basement flooding occurrences?

Alta Vista (Chalmers)

There are few properties that experienced basement flooding on September 9, 2004. The homeowners in this neighbourhood whose homes were influenced by the level in the Rideau River Collector received letters from the City on the Residential Protective Plumbing Grant Program. The City offered to cover the protective plumbing costs in recognition of the work and timing required to reduce levels in the Rideau River Collector.

Alta Vista (Blossom/Utah)

The solution includes constructing a new sanitary sewer outlet to the Rideau River Collector along parts of Kilborn. Sewers along parts of Blossom, Begonia and Dahlia will also be reconstructed to reduce stormwater inflow into the sanitary sewer and to increase the capacity of the sewer system. These improvements will increase the level of protection against basement flooding from sewer backups.

Faircrest Heights

The solution includes constructing a new sanitary sewer outlet to the Rideau River Collector along parts of Billings. This will intercept part of the catchment area that is draining through Balmoral. This improvement will increase the level of protection against basement flooding from sewer backups.

Elmvale Acres/Urbandale Acres

These neighbourhoods are still under review and will be finalized in early 2006.

Riverview Park (Drake)

The solution includes reconstructing the main sewer outlet for this neighbourhood. Work has already been undertaken along parts of Cluny and Lennox. The sanitary sewer improvements need to be continued along Cluny, Knox and Drake. These improvements will increase the level of protection against basement flooding from sewer backups. Ongoing work will also be required to address infrastructure renewal needs through the annual capital program.

Ridgemont

The solution includes reconstructing the outlet sewer along Bank Street. This improvement will increase the level of protection against basement flooding from sewer backups.

How much will it cost to implement these solutions and when can these be done?

Alta Vista (Chalmers)

The estimated cost for providing protective plumbing for affected properties in this neighbourhood is $30,000. Funds are available in the 2005 Residential Protective Plumbing Program.

Alta Vista (Blossom/Utah)

The estimated cost for sewer improvements is $1,200,000. These works will be coordinated with watermain replacement and road reconstruction. This has been identified in the 2006 Draft Capital Budget for implementation in 2006.

Faircrest Heights

The estimated cost for sewer improvements is $1,000,000. These works will be coordinated with watermain replacement and road reconstruction. This has been identified in the 2006 Draft Capital Budget for implementation in 2006.

Elmvale Acres/Urbandale Acres

The preferred solution will be defined in early 2006. Design of the preferred solution will be initiated in 2006. Funding for construction will be identified in a future capital budget.

Riverview Park (Drake)

The estimated cost for sewer improvements is $1,600,000. These works will be coordinated with watermain replacement and road reconstruction. This has been identified in the 2006 Draft Capital Budget for implementation in 2006.

Ridgemont

The sewer improvements will be coordinated with the Bank Street reconstruction. Design will be initiated in 2006. Funding for construction will be identified in a future capital budget.

WARD 19 CUMBERLAND

To what extent is this Ward affected by basement flooding from sewer backups?

There are 17 isolated locations that reported basement flooding on September 9, 2004. Due to the randomness of the locations, it is considered that these flooding occurrences are related to service connection problems, internal plumbing deficiencies or local grading deficiencies, and not as a result of a backup of the City’s sewer system. The Department has sent letters to residents that experienced “isolated” basement flooding on September 9, 2004 with an offer to investigate and confirm the condition of the sewer connection.

What is the cause of repeated basement flooding in these areas?

Repeated flooding has not been experienced in this Ward. Properties in this Ward that are on municipal services are serviced by fully separated storm and sanitary sewer systems.

What is the history of basement flooding in these areas?

There is no history of areas that are subject to repeated flooding in this Ward.

What are the solutions to reduce the frequency of basement flooding occurrences?

Not applicable.

How much will it cost to implement these solutions and when can these be done?

Not applicable.

WARD 20 OSGOODE

To what extent is this Ward affected by basement flooding from sewer backups?

There are no properties in this Ward serviced by municipal sewers.

What is the cause of repeated basement flooding in these areas?

Repeated flooding has not been experienced in this Ward.

What is the history of basement flooding in these areas?

There is no history of areas that are subject to repeated flooding in this Ward.

What are the solutions to reduce the frequency of basement flooding occurrences?

Not applicable.

How much will it cost to implement these solutions and when can these be done?

Not applicable.

WARD 21 RIDEAU

To what extent is this Ward affected by basement flooding from sewer backups?

There are no properties in this Ward serviced by municipal sewers.

What is the cause of repeated basement flooding in these areas?

Repeated flooding has not been experienced in this Ward.

What is the history of basement flooding in these areas?

There is no history of areas that are subject to repeated flooding in this Ward.

What are the solutions to reduce the frequency of basement flooding occurrences?

Not applicable.

How much will it cost to implement these solutions and when can these be done?

Not applicable.

Annex 3

Help Yourself – Help Your Neighbour – Flow Removal Checklist

Annex 4

Residential Protective Plumbing – Grant Assistance Program