City of Langford Rainwater Management

Transcription

1 City of Langford Rainwater Management Managing Risk... Learning by Doing Adapting By John Manson, P.Eng City Engineer

2 Today s Presentation Langford s Corporate Culture Our current (evolving) approach to Rainwater Management Future Rainwater BMP Initiatives

3 Langford s Corporate Culture Only Incorporated 15 years ago! Few Policies in place; Politicians were new; Langford was ready for a new look ; Political Mandate was there; Council has remained largely the same

4 Langford s Corporate Culture The Result.. A risk taking environment.. The 90/10 rule.. The lack of policies, fresh staff, lack of history: = learn by doing!

5 Langford s Corporate Culture Creative Problem Solving Problem Identification Review Traditional Approaches Look for Innovative Alternatives Give it a try! How has it worked? Adjust Adopt policy

6 Langford s Corporate Culture Examples Rainwater Management: Infiltration At incorporation, mostly open ditches Rock Pits were already being used Current BMP s were encouraging zero impact discharges Result was a policy of Zero Rainwater Discharge

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8 The Policy Rainwater Management All Development is required to manage stormwater onsite; All development is required to maintain their onsite infiltration systems Restrictive Covenants required; Annual maintenance inspections required by Bylaw; Developments generally have not been required to extend storm drainage systems..

9 Langford: Stormwater Management Has it Worked?? Generally.. Yes! The downtown area is predominately unsaturated gravel, functions well.

10 Langford: Rainwater Management The 2006 Winter Storms (The Good). Generally good performance in downtown in 2006; System provides effective feedback to owner or City if maintenance required; Most portions of the downtown could accommodate peak flows, some short duration backups..

11 Langford: Rainwater Management The 2006 Winter Storms (The not so Good). Some areas were marginally suitable for infiltration; Some areas of high groundwater tables; Owner feedback why doesn t the municipality provide a connection?; The need to know where that water is going

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16 Rainwater Management

17 Rainwater Management We re Adjusting! Considering combination infiltrator/horizontal pipe systems to provide an overflow route; More comprehensive onsite drainage investigations required; Not all areas will required to infiltrate. But we still support the principle of on-site infiltration

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19 Westhills Green Community Taking LEED to the Community Level

20 Westhills Green Community: Large undeveloped site adjoining town centre: just under 500 acres in size Approximately 6,000 Res Units, Town Centre

21 LEED-ND Smart Location & Linkages Proximity to Water and Wastewater Infrastructure Wetland and Water body conservation Restoration of Habitat or Wetlands Green Construction & Technology Certified Green Buildings Reduced Water Use Minimize Site Disturbance Stormwater Management Wastewater Management Indirectly Related Reduced Parking Footprint Walkable Streets Energy Efficiency and Recycled Content

22 Elements of Master Dev t Plan Mixed use commercial, residential & learning commons in village centre and two other neighbourhood commercial centres Rail link to other population centres 40% green space retained based on Wildlife corridors and sensitive ecosystems Live/work/walk community: green streets Increased density (around 6,000 units plus 1M sq ft comm Affordable Housing (mandatory rental, mandatory secondary suites, small lots) Site wide sustainable initiatives: Rainwater Management and Reuse, Energy (District Heating, Heat harvesting), San Sewage Reuse (advanced secondary/tertiary proposed) All commercial and multifamily units will be LEED certified, SFD Buld green certified free internal bus service

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24 Westhills Water Strategies Certified Green Buidings: 100% On-site tertiary sewage treatment Recycled water used for irrigation, toilet flushing, and wetland enhancement Preservation & enhancement of wetlands & water bodies Reduced water use Sediment and Erosion Control, Topsoil Man. Comprehensive Rainwater Management

25 How do we get there?? The Integrated Utility Concept One utility provider managing water supply, liquid waste management; District Heating, local transit, and possibly others...

26 Questions????