Storm Drainage Program

The Storm Drainage Program is based primarily on the Storm Drain Master Plan, completed in 1994. The master plan identifies and prioritizes improvements that are needed to convey or detain a 25–year storm, and provides an estimated cost for each improvement in 1996 dollars.

Storm drain improvements fall into three categories:

• Increased-capacity projects to upsize pipes that are not large enough to carry a design storm.
• Maintenance and replacement projects to replace deteriorated or failing pipes in the system.
• System expansion as new streets are constructed or upgraded.

Two major storm water construction programs dominate the FY 99/00 CIP. Council approved the programs in 1997 and 1999 to address potential flooding in two tributary drainage basins of the Erickson Creek basin - the Westside Interceptor and Central Interceptor Storm Drainage Improvements. Each interceptor drains storm water run-off from separate sub-basins of Erickson Creek. Neighborhood flooding occurred in 1996 and 1997 in the area served by the Central Interceptor and Westside Interceptor storm drain systems due to both unusually high amounts of rainfall and a drainage system capacity deficiency.

Funding

Storm drainage improvements are funded by the Storm Drain Fund (513). "Increased-capacity" improvements are financed through SDCs, "maintenance and replacement" projects are financed by the monthly storm drain service charge, and "system expansion" improvements are funded and constructed as part of street improvements.

Storm Drainage Tips and FAQs

For more information see Storm Drains—Frequently Asked Questions.

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