Rainwater Management

1
Rainwater Management
Single Family Properties
New Direction for Watershed Health

• March 3, 2006
• Richard Boase, P.Geo., CCEP
• North Vancouver District

2
Single Family Rainwater Mgt.

• Why is this an issue?
• How do we implement effective change?
• How do we monitor results of decisions
  made?

3
What's the BIG deal?
4
Single Family Rainwater Mgt.

• DNV encompasses 16,237 Ha. (63 mi.2)
• 64.5 Wilderness Area
• 19.5 Residential
• 8.3 Urban Parks
• 3.3 Conservation
• 2.1 Industrial

5
Single Family Rainwater Mgt.

• Population approximately 80,000
• 27,319 dwelling units (incl. M/F)
• 70 detached single family
• 11 increase in dwelling units 1986-1991

6
Single Family Rainwater Mgt.
Science tells us that watershed health begins to
deteriorate as a watershed moves beyond 10 total
impervious surface area.
7
Single Family Rainwater Mgt.
Reduced cover
Reduced complexity
High sediment loads
Increased bank erosion
Poor sediment water quality
8
Single Family Rainwater Mgt.
What are the issues? (REALLY!)
9
Total lot area 1901 sq. m.
Aging SFD stock gt50 years Lower land
value Different appreciation for space
15 Landscaping
10
Total lot area 1972 sq. m.
28 Landscaping
New SFD stock lt 10 years Higher land
value Different appreciation for space
11
59 increase
88 increase
12
Single Family Rainwater Mgt.

• Why is this an issue?

13
Single Family Rainwater Mgt.
How do we implement change?
14
(No Transcript)
15
Single Family Rainwater Mgt.
Site
Building size Hard surface Landscaping
Watershed Health
16
Single Family Rainwater Mgt.

• Yes we can make a difference if we have
• Policies
• Bylaws
• Standards

17
Single Family Rainwater Mgt.
City of Courtenay
18
Infiltration Facilities
New residential standards
19
Rain Garden
20
Adsorptive Landscaping
21
Pervious Paving
22
Single Family Rainwater Mgt.
Can we make a difference?
23
(No Transcript)
24
Single Family Rainwater Mgt.

• Water Balance Model
• Example
• Benefits of Source Control

25
Benefits of Source Control
26
Single Family Rainwater Mgt.

• Why is this an issue?

27
Single Family Rainwater Mgt.
Yes