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Stormwater Resources for Contractors and Consultants
Development
- City of Gig Harbor Stormwater Management and Site Development Manual
- Stormwater Maintenance Agreement Template
- Flow Charts for Determining Applicability of Minimum Requirements
- Infeasibility Criteria for Minimum Requirement 5
- Municipal Code Title 14
- Emerging Stormwater Treatment Technologies (Ecology)
- Stormwater Site Plan for Small Projects Form (coming soon!)
Underground Injection Control (UIC)
If your project includes sub-surface infiltration (UIC, wells), you may need to register the facility with the Department of Ecology (excluding wells at single-family homes or duplexes receiving only residential roof runoff or used to control basement flooding). See Ecology's website for the definition of UIC's and registration application: Underground Injection Control Registration
❗ DIRECT DISCHARGE
In the City of Gig Harbor, flow control exemption is only granted to projects on parcels that immediately abut a saltwater body or tidally influenced waters which do not discharge stormwater runoff through a municipal stormwater system.
Stormwater Minimum Requirements
- Stormwater Site Plans
- Construction Stormwater Pollution Prevention
- Source Control of Pollution
- Preservation of Natural Drainage Systems and Outfalls
- Onsite Stormwater Management
- Runoff Treatment
- Flow Control
- Wetlands Protection
- Operations and Maintenance
- Financial Liability
Construction
Construction activities disturb soil, increasing the risk of erosion and polluted runoff. Without controls, sediment and debris can enter storm drains and harm local waters.
Stormwater BMPs like silt fences, inlet protection, and stabilized entrances are required to keep pollutants on-site and protect water quality.
- Construction Best Management Practices (Stormwater Manual Volume II)
- Source Control: Concrete Washout
- Source Control: Demolition
- Source Control: Building Repair, Remodeling, Painting, and Construction
Many construction projects require a Construction Stormwater General Permit from the Department of Ecology. Click the links below to see if your project needs coverage, apply for a permit, and get assistance for permit compliance.
Low Impact Development (LID)
Low Impact Development (LID) is a stormwater management approach that mimics natural hydrology by managing runoff close to its source. LID strategies reduce impervious surfaces, promote infiltration, and use engineered systems like bioretention, permeable pavement, green roofs, and rainwater harvesting to minimize impacts to downstream receiving waters.
Implementing LID helps meet NPDES permit requirements, improves water quality, reduces flooding, and can lower infrastructure costs.
Photo credit Marcela Gara, Resource Media. Washington Environmental Council WEC