Rainwater Management March 3, 2006 Richard Boase, P.Geo., CCEP North Vancouver District Single Family Properties New Direction for Watershed Health

Single Family Rainwater Mgt. Why is this an issue? How do we implement effective change? How do we monitor results of decisions made?

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

Single Family Rainwater Mgt. Population approximately 80,000 27,319 dwelling units (incl. M/F) 70% detached single family 11% increase in dwelling units

Single Family Rainwater Mgt. Science tells us that watershed health begins to deteriorate as a watershed moves beyond 10% total impervious surface area.

Single Family Rainwater Mgt. Poor sediment & water quality High sediment loads Reduced cover Reduced complexity Increased bank erosion

Single Family Rainwater Mgt. What are the issues? (REALLY!)

Aging SFD stock >50 years Lower land value Different appreciation for space Total lot area = 1901 sq. m. 19% Hard Surface 53% Tree Canopy 15% Landscaping 13% Building Footprint

New SFD stock < 10 years Higher land value Different appreciation for space Total lot area = 1972 sq. m. 24% Building Footprint 25% Hard Surface 23% Tree Canopy By Covenant 28% Landscaping

59% increase88% increase

Single Family Rainwater Mgt. Why is this an issue?

Single Family Rainwater Mgt. How do we implement change?

Single Family Rainwater Mgt. Site Watershed Health WBM Building size Hard surface Landscaping

Single Family Rainwater Mgt. Yes we can make a difference if we have; Policies Bylaws Standards

Single Family Rainwater Mgt. City of Courtenay

Infiltration Facilities New residential standards

Rain Garden

Adsorptive Landscaping

Pervious Paving

Single Family Rainwater Mgt. Can we make a difference?

Single Family Rainwater Mgt. Water Balance Model Example Benefits of Source Control

Single Family Rainwater Mgt. Why is this an issue?

Single Family Rainwater Mgt. Yes