Brigitte A. Berger, Director of Engineering
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1 Brigitte A. Berger, Director of Engineering
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13 Wilmette s Sewer System Overview of Wilmette s Sewer System Green vs. Gray? Stormwater Action Plan Regulatory Compliance Why Homes Flood What can homeowners do to protect their property? Homeowner Resources
14 Wilmette s Sewer System Separate Sewer Area Combined Sewer Area Ridge Road Topographical Divide
15 Wilmette s Sewer System Combined Sewer System East of Ridge Road 1872 Wilmette is incorporated. Sewers discharge into Lake Michigan 1914 Sheridan Road interceptor constructed. Sewers discharge into North Shore Channel 1921 Sewerage is treated at Howard Street treatment plant
16 Wilmette s Sewer System Combined Flows Dry weather MWRD Interceptor MWRD Treatment Deep Tunnel Overflow North Shore Channel Lake Michigan
17 Wilmette s Sewer System Separate Sewer System West of Ridge Road 1930 to 1950 Separate sewers constructed Building sanitary and storm laterals constructed side by side in same trench Sanitary system has two outfalls Harms Road Princeton Place
18 Wilmette s Sewer System Sanitary Outfall Locations Harms Road and Princeton Place Interceptors *
19 Wilmette s Sewer System North Branch Chicago River Stormwater Outfall
20 Green vs Gray Green VS Gray
21 Green vs Gray Rain Barrels Precipitation 1 inch Average Roof Area 40 ft x 50 ft 2000 ft 2 Rain Barrels 23 Barrels Per house
22 Green vs Gray Rain Barrels April 2013 storm event (25-year storm event) 5.5 inches or 125 barrels per house Roof drainage only
23 Sewer System: Past Total invested since 1990: Over $51 million Combined Sewer Area Relief sewers Street berms and inlet restrictors Separate Sewer Area Relief sewers Second stormwater outfall Backup generator at stormwater pump station Village Wide Maintenance Sewer Cleaning/ Televising Lining
24 Berms and inlet restrictors create street detention
25 Stormwater Action Plan 4 Components: 1. Excessive inflow & infiltration (I/I) 2. Sewer capacity / bottlenecks 3. Outflow Restrictions at Harms Road and Princeton Place 4. Manage Stormwater Public Sewer Line
26 Stormwater Action Plan Project Goal Status Hydraulic Study of the Sanitary System Pump Station with inline storage Determine location of bottlenecks and flow meter outlets and basins to determine I/I Improve outlet condition of the sanitary system Completed in The West Park Sanitary Storage Project is on schedule to break ground in October, Collection system improvements Eliminate bottlenecks that restrict flow during wet weather The Local Storage Projects are underway and scheduled to be completed November 30, 2014 MH / sewer lining and repairs Storm sewer improvements Reduce infiltration and improve structural integrity Reduce storm sewer surcharging and street ponding Annual program is on-going System hydraulic and hydrologic data collection complete. Alternatives analysis underway.
27 Drainage Basins Harms Basin Princeton Basin
28 Stormwater Action Plan West Park Sanitary Storage Project Three Project Goals: 1. Control backflow from MWRD 2. Build pump station 3. Build storage reservoir
29 Stormwater Action Plan West Park Sanitary Storage Project Project benefits over 1300 homes west of Romona Road $16.6 million Operational by fall of 2015
30 Stormwater Action Plan Local Storage Projects: Wilmette Avenue
31 Stormwater Action Plan Local Storage Projects: Hibbard Road
32 Drainage Basins Hibbard Road Wilmette Avenue
33 Local Storage Project: Wilmette Avenue
34 Local Storage Project: Wilmette Avenue
35 Manhole Lining and Repairs
36 Stormwater Action Plan West Side Storm Sewer Study 1. Over 1500 structures surveyed 2. Flow monitoring 3. Resident Survey 4. Hydrologic and hydraulic model development 5. Project alternatives to be presented to the community this November
37 Sewer System: Looking Forward Kenilworth Gardens 1. Sanitary flow metering in Evaluation of MWRD outfall connection 3. Smoke Testing 4. Sewer & Manhole lining 5. Storm sewer hydraulic analysis 6. Communication with neighboring Villages and MWRD 7. MWRD flow monitoring
38 Stormwater Action Plan Kenilworth Gardens
39 Stormwater Action Plan Kenilworth Gardens
40 Regulatory Compliance West of Ridge Road, the Village operates a Municipal Separate Storm Sewer System (MS4). In 1999, MS4 communities were required to optain a National Pollutant Discharge Elimination System (NPDES) permit.
41 Regulatory Compliance Annual reporting and monitoring of six minimum control measures: Public Education & Outreach Public Participation/Involvement Illicit Discharge Detection and Elimination Construction Site Runoff Pollution Prevention
42 Why Homes Flood
43 Why Homes Flood In order to solve the problem, we need to understand WHY homes flood. This is not a one-size-fits-all problem. Topography Sewer Surcharging Sump Pump Failure Seepage Window wells / basement doors / depressed driveways Lateral cracks / blockage
44 Why Homes Flood Storm Water Sources
45 What should homeowners do? Disconnect from storm sewer Less impervious area and less sod More rain gardens and bioswales Protect home with overhead sewer or flood control Check grading around foundation Install drain tile and sump pump
46 What can homeowners do? Protect home with overhead sewer or flood control
47 What can homeowners do? Check grading around foundation
48 What can homeowners do? Direct downspouts away from foundation
49 What can homeowners do? Install drain tile and sump pump
50 Most important thing every homeowner should do
51 Maintain your sewer lateral Clean Televise Line An estimated 50%-80% of groundwater infiltration is from private sewer laterals.
52 Resident Resources Wilmette Website: Go to Engineering Department web page for: Resident Assistance Programs Guide to Flood Protection in Northern Illinois Rain garden information Center for Neighborhood Technology (CNT) Residents can contact the Engineering Department if they have additional questions
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