Rainwater Management Landscape-Based Solutions. The Corporation of Delta Showcasing Innovation Series September 21, 2007

Transcription

1 Rainwater Management Landscape-Based Solutions The Corporation of Delta Showcasing Innovation Series September 21, 2007

2 Municipal Rain Water Management Objectives To increase permeable surfaces throughout the Municipality of Delta To focus rainwater infiltration efforts on sites that ultimately drain into streams, ravines, and other waterways Improve local streetscapes Increase community awareness

3 Overview 1) Storm Water BMP Design Guide 2) Municipal Implementation Considerations 3) Project Implementation

4 1) Stormwater BMP Design Guide 1. Local Area Suitability 1. Review of Soil / Climatic / Receiving Environment Characteristics 2. Design Standards 1. Review of BMPs and suitability for Delta 2. BMP Designs for Local Areas 3. Bylaw Changes 1. Suggested Subdivision Bylaw Improvements

5 1) Stormwater BMP Design Guide

6 2) Municipal Implementation Issues 2.1) Design / Implementation Team 2.2) Identifying BMP Opportunities 2.3) Design Issues / Components

7 2.1) Integrated Design Team Engineers Engineering technicians Landscape designers Planners Operations

8 2.2) Opportunities for BMPs Parking lots pervious paving / rain gardens ROWs pervious paving / swales / rain gardens Parks swales / habitat enhancement

9 2.3) Design Issues / Components Engineering Design Requirements e.g. return period, design flow, structural loading Site Issues / Considerations Local Soil Conditions Infiltration rate of soil; design consideration: depth of topsoil; drain rock; pervious PVC pipe Operation Issues Surface inlet clogging; system redundancy / backup; maintenance of vegetated areas; infiltration system maintenance

10 3.0) Project Implementation Municipal Parking Lots Municipal Rights of Way Community Projects Design Construction Landscaping Operation (photo of design drawings, site under construction, And a finished landscape)

11 3.0) Project Implementation 15 projects have been completed since 2005: North Delta: Kittson Parkway pervious parking lot Delview Park swales Lyon Road swales Sunwood Drive rain garden 86 Avenue rain gardens 92 Avenue at-grade sidewalk Fairlight Crescent ditch daylighting Lyon Road at Lawrie Crescent rain gardens Knight Drive at-grade sidewalk 120 Street at-grade sidewalk and rain gardens Cougar Canyon elementary school rain garden 108 Street rain gardens Ladner: Evergreen Lane rain gardens Holly Park pervious parking lot Tsawwassen: 55B Street rain garden And many more projects on the go

12 Municipal Parking Lots Kittson Parkway Holly Park Evergreen Lane 108 Street

13 Kittson Parkway - Design

14 Kittson Parkway Post construction

15 Kittson Parkway - Operations Issue Maintenance!

16 Holly Park Pervious Pavement overflow pond

17 Holly Park Overflow Pond

18 Evergreen Lane Parking Lot

19 Evergreen Lane Rain Garden 1.5m of absorbent topsoil

20 Evergreen Lane Rain Garden Operation After 25 straight days of rain (no overflow)

21 Late summer flower display Evergreen Lane Rain Garden Operation

22 108 Street Parking Lot

23 108 Street Parking Lot - Design

24 108 Street Parking Lot - Construction

25 108 Street Parking Lot - Construction

26 108 Street Parking Lot - Operation

27 108 Street Parking Lot - Operation

28 108 Street Parking Lot - Maintenance

29 Municipal Rights-of of-way 86 Avenue Rain Garden Lyon Road Swales Knight Drive

30 86 Avenue Rain Garden

31 86 Avenue Rain Garden - Design

32 86 Avenue Rain Garden - Construction

33 86 Avenue Rain Garden - Completion (April-2006)

34 86 Avenue Rain Garden Completion one year later

35 Lyon Road Swales - Design (2005)

36 Lyon Road Swales (2005) - Construction

37 Lyon Road Swales Completion (2005)

38 Lyon Road Swales - Operation (2005)

39 Knight Drive Sidewalk

40 Community education is key to successful BMP implementation

41 Knight Drive boulevard plantings: Discourage parking on sidewalk Increase pedestrian safety

42 Knight Drive plantings (November)

43 Community Projects Delview Park Fairlight Ditch

44 Delview Park Swale Community planting party (October 2005)

45 Wildlife habitat! (May 2007) Delview Park Swale

46 Fairlight Crescent Ditch Daylighting

47 Fairlight Ditch Daylighting Design (2006)

48 Fairlight Crescent Ditch Daylighting - Construction

49 Fairlight Ditch Daylighting - Landscaping (by residents)

50 Fairlight Ditch Daylighting Community Education

51 Estimated Construction Costs: 1. Daylighting a ditch: $750 / linear metre vs. Culverting a ditch: $ / linear metre (300mm Ø pipe) 2. Pervious paving: $60 / m2 vs. Conventional paving: $35 / m2

52 Summary Bylaw / policy / design framework Huge need for educating designers and contractors/builders Integrated team approach (use different strengths) Flexibility and thinking outside the box with respect to design standards Maintenance costs INCREMENTAL SUCCESS