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Broadview Sewer and Drainage Improvement ProjectBroadview CommunityMeetingSeptember 25, 2012
Broadview Basin Historyo Broadview sewer systeminstalled in 1950sDuring Significant Storms:o Stormwater andgroundwater getting intosewer pipes Causes sewer backupsin some locationso Stormwater flooding inareas of BroadviewBroadview Neighborhood Map
Project Goalso Reduce sewerbackups into homes,right of way andPiper’s Creeko Reduce stormwaterflooding that is publichealth and safety risko Help protect Piper’sCreek WatershedResidents meet contractors for earlyaction work
Surcharged Sewer Pipes in Dec 2010 Storm
Work Completed Completed sewer andstormwater flowmonitoring last winter and spring Developed computer modelof sewer and stormwaterflows Completed basin pipecondition assessment Implemented early actions Identified set of potentialsolutionsWorker conducting CCTV work
Work CompletedModeling and Monitoring Completed Monitored flows in sewer pipes,stormwater ditches and in streetsduring storms Completed site visits in Broadview Developed computer model which:o Predicts flows for sewer andstormwater systemo Helped identify areas for service improvementso Will predict how system would function withpotential future improvements
Work CompletedEarly Actions Sewer backflow valvesinstalled Sealed sewer pipes onportion of 12th Ave andadjacent side sewers Localized drainageimprovements underwayFlood grouting activities
Work CompletedEarly Actions - Sewer backflow valves installed Valves reduce risk of a sewerbacking up into homes 19 valves installed onproperties most at risk ofsewer backups 4 valves are in process ofbeing installedBackflow valve
Work CompletedEarly Actions - Sealed sewer pipes on portion of 12thAvenue Flood grouting/sealing of sewerpipes to reduce water infiltrationinto pipes 87 homes participated in thepilot project to seal their sidesewers 50 additional maintenance holessealed Results: Early data showssealing was successful
Work UnderwayEarly Actions - Local drainage improvementsDrainage improvement planned in fall 2012o 3rd Ave NW between NW 104th and NW 105thEvaluating Solutions for following locations:o NW 125th St at 9th Ave NWo NW 120th St west of 9th Ave NWo NW 120th between 6th & 7th Ave NWo N 125th St and Phinney Ave N.
Broadview Sewer ServiceTools for Improving Sewer Serviceo Reduce amount of stormwater getting into sewers from: Roof drains Sump pumps and foundations drains- And re-route to stormwater systemo Reduce infiltration (groundwater entering sewer) Seal sections of sewer system Replace sections of sewer systemo Increase system capacity By building new/larger pipesand/or adding storage Downstream implications mustbe considered
Broadview Drainage SystemTools for Improving Stormwater Serviceo Reduce stormwater volume through: Shallow infiltration into ground– in vegetated areas Deep infiltration into ground –with vegetated area prior toinfiltration for water qualitytreatmento Add stormwater storage in above-ground plantedtemporary holding area, or in pipeo Increase capacity by: Improved/expanded ditches and/or pipes
Project Focus AreasIdentifying solutions thatmeet project goals:o Dayton Avenue basin,includes 1st Ave and105th includes most ofthe east half ofBroadview basino 12th Avenue basinincludes about half ofwest side of Broadviewbasin
Storm Season Preparation – How You Can HelpHelp prevent stormwater flooding into homes or ontoproperties Please help keep stormwater system (e.g., ditchesand stormwater grates) near your home clear ofdebris and leavesIf you experience sewer backups or stormwaterflooding Call (206) 386-1800 to reach someone 24 hours aday, 7 days a weekPat O’Brien - Storm Observers Program
We Want to Hear from YouSimultaneous discussion sessions:o Dayton basin – focus on potential sewer systemimprovementso 12th Ave basin – focus on potential sewer systemimprovementso Backflow Pilot Projecto Early Action/Local Drainage Improvementso Floodgrouting Pilot Project – sealed sections of sewerin upper 12th Ave NWo Restore Our Waters – tableo New GIS tool showing in 3-D the existing stormwaterand sewer system in Broadview
Next Stepso Next community meetingin first quarter 2013(approx), bringing latestinformation on alternativesfor sewer systemimprovementso Contact us: Phone: 206-409-3651 Email: info@broadviewprojects.com web page in process of being updated)
Broadview Sewer and Drainage Improvement ProjectQuestions?
Broadview Sewer Service Tools for Improving Sewer Service o Reduce amount of stormwater getting into sewers from: Roof drains Sump pumps and foundations drains - And re-route to stormwater system o Reduce infiltration (groundwater entering sewer) Seal sections of sewer system Replace sections of sewer system
