From Storm Drainage to Raindrop Management. By Robert Hicks, Senior Engineer April 29, 2009
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1 From Storm Drainage to Raindrop Management By Robert Hicks, Senior Engineer April 29, 2009
2 130 drainage 130 drainage catchments
3
4 Background 1996 Metro Vancouver developing LWMP approved in 2002 Issues population growth land development drainage impacts on agricultural lands degradation of urban salmon habitat Resources Stormwater Management Task Group (later SILG) University of Washington research GIS 2009 Metro Vancouver updating LWMP
5 1996 Population Density Suburban Density 8-50 cap/ha Urban Density cap/ha Ultra-urban Density cap/ha
6 2021 Scenario Suburban Density 8-50 cap/ha Urban Density cap/ha Ultra-urban Density cap/ha
7 2051 Scenario Suburban Density 8-50 cap/ha Urban Density cap/ha Ultra-urban Density cap/ha
8 Stream Health & Hydrology University of Washington s Findings 100 empirical relations for lowland streams stream health 60 hydrology 50 riparian forest integrity 40 hydrology critical parameter B-IBI index validate for Metro Vancouver Forest Riparian F ntegrity % In 90 Excellent Good Fair 40 Poor % Total Impervious Area
9 Watershed Health 1996 Excellent Health Good Health Fair Health Poor Health
10 Watershed Health 2036 Excellent Health Good Health Fair Health Poor Health Status Quo Scenario
11 Historical Trend Second Creek relocated 3 m below Valley Drive
12 Moving to Integrated Planning Solution requires integrated planning engineering planning ecology LWMP requires integrated stormwater management plans at the watershed scale Template assists municipalities revised and updated in 2005/6
13 Needing a New Business as Usual Need to be able to implement Integrated Stormwater Management Plans Not sure of contents or approach Also addressing conventional drainage at the same time Exploring linkages between land-use use, redevelopment timelines and stormwater management
14 Four Part Inspiration In 2001, building stock was being replaced approximately every 50 years on average Still Creek Flood Reduction German Greenroofs Still Creek Watershed adjacent to SkyTrain
15 A Long Range Plan and Solution What would be the benefits of onsite stormwater phased-in over 50 years? what could be achieved on each lot? do they add-up and work together? A water balance model was created to answer these questions
16 Effect of Rainfall on Infiltration Performance Local Road (8.5 m roadway), Poor Soils (2.5 mm/h) Volum me of Ru noff from Road Right t-of-way (% of tot tal rainfa ll) Feasibility Threshold Affordability Threshold Width of Infiltration Swale/Trench (m) Location and Annual Rainfall (1999) Burnaby Mountain (2675 mm) North Vancouver (2355 mm) Maple Ridge (1811 mm) North Surrey (1733 mm) White Rock (1084 mm) White Rock (2000 rainfall, 709 mm)
17 Fitting the Pieces Together
18 1996 Population Density Quibble Creek Watershed, Surrey Suburban Density 8-50 cap/ha Urban Density cap/ha Ultra-urban Density cap/ha
19 2021 Scenario Suburban Density 8-50 cap/ha Urban Density cap/ha Ultra-urban Density cap/ha
20 2051 Scenario Suburban Density 8-50 cap/ha Urban Density cap/ha Ultra-urban Density cap/ha
21 Quibble Creek Watershed Current Trends 8,000,000 An nnual Runo off Volume (m 3 ) 7,000,000 6,000,000 5,000,000 4,000,000, 3,000,000 2,000,000 1,000, Year
22 Quibble Creek Watershed Current Trends 8,000,000 An nnual Runo off Volume (m 3 ) 7,000,000 6,000,000 5,000,000 4,000,000, 3,000,000 2,000,000 1,000, Year
23 Quibble Creek Watershed ISMP Set Targets 8,000,000 An nnual Runo off Volume (m 3 ) 7,000,000 6,000,000 5,000,000 4,000,000, 3,000,000 2,000,000 1,000,000 0 Target is Specific to each Watershed as determined in each ISMP Year
24 Quibble Creek Watershed Source Control Results 8,000,000 An nnual Runo off Volume (m 3 ) 7,000,000 6,000,000 5,000,000 4,000,000, 3,000,000 2,000,000 1,000, Year
25 Inter-Governmental Partnership
26 Source Control Design Guide Supports the Water Balance Model Award Winning Canada Landscape Architects Referenced in National Infrastructure Guidelines Extensive international review
27 The Revelation Rainwater W Geiger und H. Dreiseitl, 2001
28 Rain Gardens Swales Greenroof Infiltration Shafts Rainwater Source Control Design Guidelines Absorbent Landscaping Pervious Paving
29 Surrey Coquitlam Maple Ridge Vancouver Burnaby West Vancouver
30 Water Balance: the New Way Rainwater is a valuable resource Stormwater is a problem caused by poor rainwater management Effective planning cannot be done in isolation WBM is an important tool integrated rainwater, landscape and land use planning, (Atelier Dreiseitl, Germany)
31 Integration and Alignment Water Balance Model and On-Site Rainwater Management Supports: Federal objectives for urban salmonid streams Provincial policies and directives in Living WaterSmart, through Integrated Resource Recovery rainwater for groundwater recharge rainwater harvesting as an alternative to potable water Municipalities by taking pressure and risk away from convention stormwater management systems
32 Challenges Better integration within municipalities planning and engineering Development of standards and skills construction and operations Improved regulatory clarity and certainty reduced risk to developers Communications and innovation share information and learn from others
33 Supported by Communications
34 The waterbucket.ca ca website Launched in 2005 The website is distinctive Key to our communication strategy Designed to provide the story
35 The Vision Provide a resource rich, highly interactive destination location for information and communication related to water sustainability in British Columbia
36 Communities of Interest Why a community of interest? Platform design Communities of Practice
37 Informing Website provides a forum Content contributors Website b enhancement benefits everyone Capacity building
38 Educating Online tools Promote long-term thinking Promote t design by nature Case studies
39 Our success to date Showcasing and tracking results What we have learned Number b of visits it The power of the website
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