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CITY OF WELLAND DOWNSPOUT INSPECTION PROGRAM SUMMER 2006 FINAL PROGRAM REPORT Introduction In the summer of 2006, the Downspout Inspection Program began as a component of the City of Welland’s Water Conservation Program. City staff conducted inspections of building roof downspouts and associated lot drainage on residential and commercial properties in selected areas of the city with a history of basement flooding. Information obtained in these inspections will be incorporated into existing inflow and infiltration studies which are currently underway for these areas. The first of these areas to be inspected were the Broadway and Clare Avenue areas (Appendix A and Appendix B respectively). Inspections took place with the intention of identifying downspouts that discharge rain water from roof surfaces to the sanitary sewer via direct connections or indirectly to building foundation weeping tiles. The program’s objective was to eliminate these direct and indirect connections to the sanitary sewer, in accordance with by-law #3913 (Appendix C) by informing the public of the importance of disconnection as a flood- proofing preventive measure. Improper routing of downspouts and poor lot-grading and drainage can contribute to basement flooding and combined sewer overflow to the environment. Residents were encouraged to reduce their property’s rainfall contribution to the sanitary system through proper lot grading around the home’s foundation, removal of downspouts and yard storm drains directly connected to the sanitary drain, proper extension of downspouts away from the home’s foundation, and proper use of a sump pump. During intense rainfall events, a large volume of rainwater can enter and overload the municipal sanitary sewer system, and/or undergo unnecessary treatment at the sewage treatment plant. Instead of being treated, this storm water should be reused or discharged to the environment, to save the City and its taxpayers money on treatment costs. Program Objectives 1) To reduce the potential of a sanitary sewer overload, associated sewer back-ups and/or basement flooding events. 2) To identify downspouts that discharge rain water from roof surfaces to the sanitary sewer via direct connections or indirectly to building foundation weeping tiles. 3) To eliminate indirect and direct connections to the sanitary sewer, in accordance with by-law #3913. 4) To inform the public of flood-prevention measures to assist property owners in resolving flooding and back-up issues. 5) To obtain information for incorporation into existing inflow and infiltration studies currently underway for the Broadway and Clare Avenue areas. 6) To obtain an inventory of storm water inflows and infiltration sources into the sanitary sewer system. 7) To obtain an inventory of surficial lot drainage characteristics. 8) To assess the need for new by-laws and design standards to regulate storm water runoff. 9) To reduce the costs incurred by the city of Welland for unnecessary treatment of storm water. Methodology The Downspout Inspection Program emphasized the importance of disconnecting downspouts from the sanitary sewer, in addition to proper lot drainage and installation of appropriate downspout extensions. City staff conducted visual inspections of building roof downspouts in selected areas of the city with a history of basement flooding. The first areas to be inspected were the Broadway and Clare Avenue areas (Appendices A and B). An inspector from the City of Welland’s Water Conservation Program visited each property to offer information regarding the downspout program and to perform the visual on-site drainage inspection. An inspection sheet was completed for the purpose of drainage data collection, along with an interview of the homeowner or occupant to acquire relevant information regarding flooding history and existing basement conditions (Appendix D; Inspection Sheet and list of definitions). This inspection sheet was designed for the purpose of this program and facilitated efficient data collection in the field. Good communication between City staff and residents was the focus of our selected inspection approach. Residents of the Broadway and Clare Avenue areas received letters in advance of the inspections with information regarding upcoming visits from Lot Drainage Inspectors to their neighbourhood (Appendix E). All completed inspections have an interview component and residents were given the chance to participate in the inspection process and/or ask questions at any time during the inspector’s visit. A better understanding of drainage situations and their impacts was expected to increase the public’s compliance with suggested repairs. Following the inspection, the informative “Break the Connection” brochure was left behind (Appendix F). Inside the brochure, residents have access to a simplified version of the completed drainage inspection, in the form of a series of checkboxes. This series of checkboxes allowed the inspectors to identify any observed house-specific drainage issues, and outline the appropriate methods for effecting repairs. The benefits of addressing the suggested repairs were also available in the brochure. In the case that a resident was not available at the time of the inspector’s initial visit, an unmarked brochure was left with comments requesting that the inspection be rescheduled at a more convenient time. Notes were made on the official inspection sheet regarding visible drainage issues only. The “Break the Connection” brochure was designed as a resource to increase public awareness by providing a straightforward explanation of the program’s objectives. It also offered a simplified version of the inspection results to be easily utilized by the residents to effect appropriate repairs. No specific references to City by-law #3913 were made in the brochure. The brochure’s diagrams were intended to help residents visualize discussed drainage situations. Finally, the “Location of defects” feature was added to assist in illustrating location-specific drainage issues. Flood proofing measures were also included. All collected data, including interview information and drainage descriptions, were entered into a Microsoft Access Database. The use of a database and its query functions allows the sorting of information by study area and scenario, and the identification of relationships between individual datasets. The ability to access address- or situation- specific information is also important when editing records and recalling the original filed inspection sheet. This database can be linked to existing databases to supplement inflow and infiltration studies, or be useful in creating maps to identify properties which have experienced basement flooding. The Downspout Inspection Program ran from June 2006 up to and including August 2006, at which point seasonal labour changes took place and there were no longer any staff present to continue inspections. Initial inspections of the 642 houses/properties in the Broadway Avenue area were completed, along with the initial inspections of the 914 houses/properties in the Clare Avenue area. Follow up inspections within both areas continued until the end of August, at which point the Downspout Inspection Program was concluded. In the letter distributed prior to inspecting, residents were encouraged to complete repairs to improve lot drainage. It was requested that all of the required and suggested repairs be carried out voluntarily within a 30 day period following the inspection date as noted on the brochure. Residents were also encouraged to contact the inspectors when repairs were completed, however, no calls of this form were received. No follow up inspections were performed and enforcement of by-law #3913 was not carried out. Recommendations To enhance the effectiveness of the Downspout Inspection Program and expand its breadth of information collection, the following recommendations for further study have been suggested. 1) Data analysis should be done to determine whether or not there is a need for a new by-law to regulate the minimum length of downspout extensions away from the building foundation. It is likely that more repairs would be completed and reported if a by-law were in effect. Assessment of the proposed reduction in storm water flows to the sanitary system with implementation of such a by-law should take place. 2) To improve residents’ responsiveness in rescheduling inspections, as well as effecting and reporting required and suggested repairs, it is recommended that the existing applicable by-laws (i.e. by-law #3913) be referred to specifically within the associated program literature. Please note that this action may also act to increase the volatility of inspector–resident relations. Compliance with the by- law would be increased by enhanced public awareness and interaction between City staff and residents or property owners. 3) A follow-up program should be implemented to obtain data from the properties which did not respond to the notice left regarding inspection rescheduling (i.e. those with building status other than “Interview/External Inspection”). The residents who were informed to have improper drainage should also be re- inspected to verify whether or not repairs have been completed. 4) The use of smoke and/or dye tests should be implemented to verify drainage routes of buried yard drains without a visible outlet. Results and Reports The following double bar graph illustrates the individual totals for each “Status of Building”, further distinguished by inspection area (i.e. Broadway and Clare Avenue). The graphed data are broken down by headings outlined in detail on the Inspection Sheet and associated definitions page (Appendix D). The following pie charts show the variation of drainage scenarios that existed in both the Broadway and Clare Avenue areas of the study. The charts are distinguishable by inspection area, and are broken down further to relate drainage scenarios with specific types of flooding that occurred on some of the inspected properties. The following reports show the various drainage scenarios existing on properties of both the Broadway and Clare Avenue areas individually. Also taken into consideration was the correlation of these Drainage Scenarios with flooding history as reported through interviews in each inspected area. "Status of Building" Summary for Properties Inspected in the Broadway and Clare Avenue Areas 600 501 500 400 390 385 Number of Inspections Broadway Area 300 Clare Avenue Area 197 200 100 14 19 18 19 8 2 2 1 1 0 0 Interview Interview/External External Inspection No One Home No One Call Back/External Refused Inspection Home/External Inspection Inspection Drainage Scenarios by Situation Number 0.13% 2.27% 0.13% 0.13% 0.40% 10.86% 0.13% 0.20% 4.20% 0.40% 0.27% 47.97% 15.12% 4.73% 0.87% 0.07% 12.13% Number 1 Number 2 Number 4 Number 5 Number 6 Number 7 Number 8 Number 9 Number 10 Number 13 Number 16 Number 19 Number 22 Number 23 Number 25 Number 28 Number 31 Properties with Main Sewer Backups and their Associated Drainage Scenarios - Broadway Area 8.57% 11.43% 42.86% 5.71% 5.71% 17.14% 2.86% 5.71% Backfill Soil Zone - Flower Shrub Beds/Borders Backfill Soil Zone - Well Graded and Drained Around House Basement Entry Wells - Yes Basement Window Wells - Yes Downspout Yard Drain - OK Downspout Yard Drain (To be Traced) - Yes Driveway Drains - Yes Overland - Away From Backfill Soil Zone Properties with Main Sewer Backups and their Associated Drainage Scenarios - Clare Avenue Area 6.52% 6.52% 41.30% 15.22% 15.22% 4.35% 10.87% Backfill Soil Zone - Well Graded and Drained Around House Basement Entry Wells - Yes Basement Window Wells - Yes Downspout Yard Drain - OK Downspout Yard Drain (To be Traced) - Yes Driveway Drains - Yes Overland - Away From Backfill Soil Zone Properties Without Flooding and their Associated Drainage Scenarios - Broadway Area 0.64% 18.53% 0.64% 8.63% 48.88% 1.92% 18.85% 0.32% 0.32% 0.32% 0.96% Backfill Soil Zone - Low/Settled Areas Around House Backfill Soil Zone - Well Graded and Drained Around House Basement Entry Wells - Yes Basement Window Wells - Yes Downspout Yard Drain - Buried Outlet Downspout Yard Drain - OK Downspout Yard Drain - Partly Obstructed Outlet Downspout Yard Drain (To be Traced) - Yes Driveway Drains - Yes Eaves Troughs - None Overland - Away From Backfill Soil Zone Properties Without Flooding and their Associated Drainage Scenarios - Clare Avenue Area 0.58% 0.39% 8.19% 3.12% 10.33% 54.00% 17.35% 0.19% 5.46% 0.39% Backfill Soil Zone - Low/Settled Areas Around House Backfill Soil Zone - Well Graded and Drained Around House Basement Entry Wells - Yes Basement Window Wells - Yes Downspout Yard Drain - OK Downspout Yard Drain - Partly Obstructed Outlet Downspout Yard Drain (To be Traced) - Yes Driveway Drains - Yes OK Overland - Away From Backfill Soil Zone Unsealed Standpipes - Yes Properties with Overland Flow Flooding and their Associated Drainage Scenarios - Broadway Area 7.69% 7.69% 48.72% 25.64% 7.69% 2.56% Backfill Soil Zone - Flower Shrub Beds/Borders Backfill Soil Zone - Well Graded and Drained Around House Basement Window Wells - Yes Downspout Yard Drain - OK Downspout Yard Drain - Partly Obstructed Outlet Overland - Away From Backfill Soil Zone Properties with Overland Flow Flooding and their Associated Drainage Scenarios - Clare Avenue Area 5.41% 1.35% 8.11% 4.05% 8.11% 55.41% 13.51% 4.05% Backfill Soil Zone - Flower Shrub Beds/Borders Backfill Soil Zone - Low/Settled Areas Around House Backfill Soil Zone - Well Graded and Drained Around House Basement Entry Wells - Yes Basement Window Wells - Yes Downspout Yard Drain - OK Downspout Yard Drain (To be Traced) - Yes Overland - Away From Backfill Soil Zone A3Y- 1 AW TO PROHI ‘31T THE CONNECTIK’G OF 30WVSPOUTS TO P4RTS OF THE SEWER SYSTEM A&D TO REPEAI. BY-LAW 3208 tiHF?EAS sectior 379(l) p a r a g r a p h 1 2 5 o f t h e M u n i c i p a l :ict, R. b. 0. 1960 c h a n t e r 749 a l l o w s Courcil t o p a s s b y - l a w s f o r prohibit- Ino ;117d requl at~rtl t h e d i s c h a r g e o f a n y q a s e o u s , l i q u i d o r s o l i d m a t t e r Into ??rd dratnage w o r k s , private branch d r a i n s a n d connectlons t o a n y s e w e r , suer svstem o r seweoe w o r k s f o r t h e carVying a w a y o f d o m e s t i c s e w a q e o r industrial wastr~ 07 Flnth, w h e t h e r corrected t o a t r e a t m e n t w o r k s o r n o t ; AfQ!I W H E R E A S t h e s a n i tary s e w e r s a n d m a n y o f t h e comhir’ed sewers o f th? Corporation w e r e n o t deslqned t o c a r r y o f f w a t e r from dowpspo~Jts cnrrected w i t h eavestroughs Of b u i l d i n g s ; An’!3 W H E P E A S i t IS desl rable t o r e q u i r e o w n e r s o f bulldirlqs lhrhnse PavpstrouChs a n d dowrsDouts c o r r e c t t o s a n i t a r y s e w e r s apd : !r ~0111~ casps com)71n”d selnlers t o dlsconr(ect t h e d o w n s p o u t s f r o m s u c h s e w e r s / . zrd t o nrohi? t ard requlate t h e connectlr’q o f d o w n s p o u t s t o s u c h s e w e r s i i n t h e c a s e 0f huildirlcls h e n c e f o r t h cofistructed, reDaired o r a l t e r e d a n d t o r e p e a l 5v-law 32ciq. P’OW THEREFORE THE MUF’ICIPAL COURCI L OF THE CORPOSATIOK OF T Y E r: ITY O F WELlANl)E’!ACTS A S FOI-LOWS: 1 . Tr t h i s hv-law (a\ “ c o m b i n e d sewer” m e a n s a s e w e r c o n s t r u c t e d t o rpcei v e h o t h sew?qe f mm hu ldinas a n d w a t e r f r o m s t o r m s a n d s u r f a c e r u n o f f throunh c a t c h klas~ r S. 07 ) “ s a n i t a r y s e w e r ” m e a n s a s e w e r const rut t e d t o dirqs through s e w e r c o n n e c t i o n s . fC! “ s e w e r ConrectioV” m e a n s a s y s t e m o f oipes o r i. i!PS, corstri:ctPd t o rp?eive w a t e r zrd sewaqe f r o m a huildir;Q a n d t o c a r r y 1 t to 7 scwpr. !d) “ s t n rm s e w e r ” m e a n s a s e w e r c o n s t r u c t e d t o recel\ n r - v bjij t c r from s t o r m s ard s u r f a c e rut- o f f t h r o u a h c a t c h b a s i n s . 3. (1) W h e r e a s e w e r c o n n e c t i o n o f a buildinq l e a d s ?irectly i-to ;I storp s e w e r , w a t e r f r o m d o w n s p o u t s c o n n e c t e d t o t h e ?aves?rgucjhs o f the hui71iV>q mn?y h e l e d d i r e c t l y i n t o t h e s e w e r c o n n e c t i o n . !?! W h e r e a s e w e r c o n r e c t i o n o f a h u i l d i n q l e a d s I ,, d i r e c t l y into a sarlitary spwer, w a t e r f r o m d o w n s p o u t s corlnscted t o t h e *?VPC~~OIJ~~~S o f t h e hlrildtrlq s h a l l r’ot h e l e d Into t h e s e w e r c o n n e c t i o n . -- ms 2 (3)(i) W h e r e a s e w e r c o n n e c t i o n o f a b u i l d i n g leads directlv i n t o a c o m b i n e d s e w e r , w a t e r f r o m downspouts connected to the eavestroughs of the building shall not be led into the sewer c o n n e c t i o n wr thout t h e w r i t t e n p e r m i s s i o n o f the Engineer of the Corporation of the City o f Welland a n d t h e E n g i n e e r s h a l l n o t q i v e such permi ss~on u n l e s s h e i s s a t i s f i e d t h a t the combined sewer IS o f s u f f i c i e n t capacitv t o receive a n d c a r r y a w a y s u r f a c e w a t e r f r o m s e w e r connectlons w i t h o u t causinq f l o o d i n g . (ii) T h e p e r m i s s i o n o f t h e Enqlneer m a y h e wrth- drawr h y h i m a t a n y t i m e b y 3 0 d a y s n o t i c e in w r i t i n g p r o v i d e d h e b e c o m e s o f t h e opinron that the combined sewer is no longer of s u f f i c i e n t c a p a c i t y t o recerve a n d c a r r y a w a y s u r f a c e w a t e r f r o m s e w e r connectlons w i t h o u t c a u s i n g flooding. ‘2 i . W h e r e , by t h i s b y - l a w , w a t e r f r o m d o w n s p o u t s c o n n e c t e d t o t h e eavestr0uaP.s o f a huildirq i s prohrhlted f r o m b e i n g l e d i n t o a sewer connection, i t s h a l l h e a l l o w e d t o d i s p e r s e u p o n t h e o w n e r ’ s l a n d . buhject t o s u b s e c t i o n 3 o f s e c t i o n 2 , w h e r e d o w n s p o u t s convec ter! t o t h e e a v e s t r o u q h s o f a b u i l d i n g l e a d drrectly i n t o a s e w e r connectior learftrq Into -7 c o m b i n e d o r s a n i t a r y s e w e r , t h e d o w n s p o u t s s h a l l t7e discornected f r o m t h e s e w e r c o n n e c t i o n b y t h e o w n e r o f t h e buildinq w i t h i r h@ d a y s f r o m t h e d a t e t h i s h y - l a w IS passed. 5. It shall he the responsibility of the Plumbinq Insoector t o imure that t h e w a t e r t r o m d o w n s p o u t s c o n n e c t e d t o e a v e s t r o u g h s is disposed of ir the manner provided for in paragraphs 2 and 3 hereof and a n v p r o p e r t i e s , buildinqs, d r a i n s , pipes, e a v e s t r o u g h s , d o w n s p o u t s a n d s e w e r connections mav b e I n s p e c t e d hy h i m a t a l l r e a s o n a b l e times f o r t h e p u r p o s e o f satrstyirq h i m s e l f t h a t s u c h w a t e r IS being d i s p o s e d o f , o r t h a t p r o v i s i o n i s beinq m a d e f o r t h e d i s p o s a l o f s u c h w a t e r i n t h e m a n n e r p r o v i d e d f o r i n s e c t i o n s 2 a n d 3. -- 3 -- Ir! t h e e v e n t o f a v i o l a t i o n o f t h i s by-law, the Plumhinq I n s p e c t o r shall give to the violator notice of such violation in wrltlnq a n d t h e v i o l a t o r s h a l l w i t h i n 3 0 d a y s a f t e r t h e d a t e ot m a i l i n g o f sucn rotice carrY o u t t h e p r o v i s i o n s o f t h i s b y - l a w ; a n d n o action shall he commer!cad agairst ary s u c h p e r s o n f o r v i o l a t i n g a n y o f t h e p r o v i s i o n s o f this !JV-law exceot a f t e r t h e e x p i r a t i o n o f 30 d a y s f r o m t h e d a t e o f m a i l i n g nf SIICM rotice a n d t h e n o n l y If t h e v i o l a t i o n h a s n o t b e e n c o r r e c t e d . 7. A n y p e r s o n who v i o l a t e s a n y o f t h e provisions o f t h i s hv-law s h a l l , u p o n c o n v i c t i o n , p a y a p e n a l tY o f n o t m o r e t h a n $100 exclusive of costs and all such peral tl es shall be recoverable underthe SUmmarY !, C o n v i c t i o n s A c t , ii. S . 0 . 1 9 6 0 a n d amerdmerts t h e r e t o . e. T h i s hY-law d o e s n o t apply to a n y huildlng t h e o w n e r nf w h i c h w a s fever express permission 9~ C o u n c i l p r i o r t o t h e 1 9 t h d a y o f FP~ rua rv A . D . 1963 t o l e a d d o w n s p o u t s c o n n e c t e d w i t h t h e e a v e s t r o u g h s of t h e buildino ir?to a s e w e r c o n n e c t i o n l e a d i n g drreCtlY i n t o a n y s e w e r he lonainr! to t h e Carporation o f t h e Cl tY o f Welland. 9. Bv-law 3?OH h e ana t h e s a m e IS hereby repealed. RST, SECOND AND THIRD TIME AND PAshED IN I COl!YCI I. THI S A. D. 1966. 0 P ;;t 0 .. c c P ‘b - - TJJ 4 --I D FloodProofing Readiness Inspections Inspection Reference No Address Identifier Parcel Identifier Date Time Inspected By Inspection Class (Initial, Follow-up,..) Status of Building: Flooding History: Building Type: Interview √ None √ Residential Single Interview/Call Back Main Sewer Backup Residential Duplex Interview/Internal-External Inspection Side Sewer Blockage Residential Multiplex √ Interview/External Inspection Overland Flow Apartment External Inspection Commercial No One Home Institutional Call Back Industrial Make Appointment Other, specify Vacant Refused Foundation Type: Basement Type: Foundation Construction: Slab Raised √ Poured Crawl √ Full depth Block Partial Basement Rock √ Full Basement Other Crawl Space Drain: Side Sewer Private: Sanitary Sump Pump: √ No None (septic system) √ None Yes √ Original Discharge Sanitary Unknown Replaced Discharge Outside Backflow valve Discharge Unknown Unknown Roof Type: Flat Roof Drains: √ Flat roof √ Unknown Sloped roof Yes Yes OK Yes Sanitary Sewer Building Perimeter Drainage Category Drainage Description Roof Downpouts Rain Barrels Problem Comment and Extensions and Extensions Location Count Count Reference I Eave Troughs √ None II Overland √ Away From Backfill Soil Zone 0 1 1 III Backfill Soil Zone : (most predominant for downspouts & rain barrels) x Well-Graded & Drained Around House 0 0 √ Flat Areas Around House 0 0 √ Low/Settled Areas Around House 0 1 No downspout extension √ Garden Shrub Beds/Borders 0 0 IV Downspout Yard Drains (Traced) x Drain OK 0 0 x Partly Obstructed Outlet 0 0 x Buried Outlet 0 0 √ Pop Up Emitter 1 0 x Perforated 0 0 V Downspout Drains (To be traced) x Yes 0 0 x Yes OK 0 0 x Yes Sanitary 0 0 VI Unsealed Standpipes (Count) 1 Yes 0 0 No cap 0 Yes OK 0 0 No cap 0 Yes Sanitary 0 0 VII Temporary Sealed Standpipes (Count) 1 Yes 0 0 Plastic cover 0 Yes OK 0 0 0 Yes Sanitary 0 0 VIII Driveway Drains (Count) 1 Yes 0 0 Grate 0 Yes OK 0 0 0 Yes Sanitary 0 0 IX Other Yard Drains (Count) 1 Yes 0 0 Patio drain 0 Yes OK 0 0 0 Yes Sanitary 0 0 X Basement Window Wells (Count) 3 Yes 0 1 Yes OK 0 0 Yes Sanitary 0 0 XI Basement Entry Wells (Count) 1 Yes 1 0 Floor drain Yes OK 0 0 Yes Sanitary 0 0 1 Must be completed in all cases Drainage Inspection E Inspection of your property identified aspects of your drainage methods that need to be addressed. Please acknowledge any checked boxes listed below and implement the necessary preventive measures to minimize future drainage and basement flooding problems Install roof eavestrough, downspout and extension, as necessary, Standpipe is not permanently capped. It may be permanently to direct roof water at least 2 metres from the foundation to a capped by tightly stuffing rags into the pipe and filling the void surface sloped away from the foundation. above the rags with concrete. Downspout should extend at least 2 metres from the foundation Settled and flat areas around the foundation should be filled in to a surface sloped away from the foundation. Downspout with clay and sod to slope away from the foundation. should never extend into backfill soil zone flower/shrub bedding, settled area, window well, basement entry well or below-grade For difficult grading situations consider using a rain barrel to driveway well. hold roof water and/or installation of a yard drain to direct roof water away from the backfill soil zone. Downspout may be connected to a yard drain that could not be located due to a possible buried outlet. Please expose the yard Congratulations, your building’s drainage methods are fully drain outlet and/or advise us of its location. compliant. Thank you for your cooperation in the inspection process. Ensure downspout yard drains are clear of debris, that their outlets are not obstructed and that they are functioning during rainfall events. Downspout yard drains should be inspected regu- larly. Downspout may be connected to the building’s foundation weeping tile and sanitary drain. Disconnect the downspout from the below ground standpipe and permanently cap the standpipe by tightly stuffing rags into the pipe and filling the void above the rags with concrete. Extend the downspout at least 2 metres from the foundation to a surface sloped away from the foundation. Drainage Problem Proper Downspout Routing Optional Downspout Yard Drain F BREAK During intense rainfall events, overloading of the municipal sanitary sewer system may result in and Foundation Drainage flooding of basements. Reducing the inflow of rainfall into your home’s sanitary drain is an Roof Roof important flood-proofing preventive measure that you should be aware of. Reducing the inflow of rainfall into your sanitary drain is achieved through proper lot grading rainfal w rainfa Eavestrough Eavestrough the around your home’s foundation, remova of downspouts and yard storm drains directly me’s foundation, remov connected to your sanitary drain, proper extension of downspouts away from your home’s our sanitar dra proper e nd p foundation removal datio anitary ain, o on, a foundation, and prop use of a sump pump. extension of do xtensioon spo ow o Downspout Downspout Connection g o to the of Rain falling onto the roof of your home is collected in eavestroughs and channeled into o th y cted c collec d eavest eavestr eavestro estro tro Pipe extension at least 2 meters Sloped surface at least 2 downspouts and extension pipes that are intended to d outs nd ext out nd exte uts n e tension pipes intended e direct rainfall runoff away from the ainfall rainfall away from house meters away from house foundation of your hom tio ion on tion ou home. om o our ome. Outlet to ground surface Basement Sloped surface at least 2 meters away from house Basement When the ground slopes toward your home and/o when downspout exten enn nd d es owa und slope to arda and/or when down o or /o wh extension pipes are xtension pi tension p xten of insufficient length, surface runoff from rainfall events saturates the bac nsufficient length, sur ce urface e all rainfa events fa ev a eve al backfill soil zone e baca so oil Backfill soil zone Yard drain sloped toward outlet surrounding your home’s foundation and collects into the foundation weep g t and san ounding y ur o nding yo nding you g d fou dation ound oundation s int t into weeping tile eping ti ping sanitary san a Foundation weeping tile drain. n. Sanitary drain Municipal Sanitary Sewer Additional Drainage Downspouts and yard st m drains that d nspouts and ard st po spouts spo s spo spou rd storm drains h t direct conn r sanitary rain result n directly connect o our sa itary drain r sult in rapid nspouts an ard sto dra ns that dir t c nect to your sanit tly nec sani it n ain ult t and Flood Proofing Measures w f rainfall o the sanitary dra n du inflow of rainfall into the s itary drain durin storm events. infal nf nf rainfal r drai during stor th sani ary d ai duri s rm events a durin r n nts Illegal Sanitary Drain Connections Rain barrels will hold roof water runoff that may otherwise accumulate around the building The municipal sanitary sewer system is not designed to convey these excess rainfall inflows and mun sanitary sew r sy tem is not d i ed o co a tary se ary se ary ry y m sys em ot desi e ign o the excess ainfa inf w the ex ess ainfa infl ess s ss fa inflow nf n f inf foundation, in the weeping tile and sanitary t, basem nt floo bas ment flo asem nt flood asement flooding and men oo n as a result, basement floo g and sewage s s to the environment are pos ble d rin intense ge sp e spills o the environmen are poss environme possible during in o os r pos Roof drain. This runoff can be used to water gardens rainfall events. ents n nts ents. and lawns to conserve potable water. Barrels need to be drained after rainfall events to be Saturation of the backfill soil zone surrounding your home may also result in a damp, clammy i ckfill ding g nding y m a re lt result Eavestrough ready for use during the next rainfall. basement and cause damage to the basement foundation over timr time. er tim Sump Pump and Backflow Prevention: Rainfall- Rainfall that inflows in sanitary drains is also conveyed to the Welland Sewage Treatment Plant Downspout induced ground water which infiltrates into the for costly and unnecessary treatment. foundation weeping tile is collected in a sump pit and discharged via a pump to an exterior surface sloped away from the backfill soil zone. Benefits of Proper Drainage Basement The ground water will not collect in the sanitary Standpipe drain. Reduces the risk basement flooding Lowers sewage treatment costs and Stormdrain improves the efficiency of sewage A backflow prevention valve, installed in the Foundation sanitary drain, where the drain exits the building, Reduces untreated sewage treatment processes weeping tile prevents basement flooding when the overflows to the natural environment Sanitary drain municipal sanitary sewer system becomes durin extreme rainfall events overloaded during intense rainfall events.
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