Stormwater System Mapping

Our maps show how stormwater moves through the city using a Geographic Information System. It stores data and allows us to do analysis that helps us manage our stormwater programs effectively and efficiently. It informs decision-making, helps us comply with regulations, and enhances community engagement. We maintain and update our existing mapping through site inspections, televising pipes and work done in the field.

What we map:

• City-owned storm drains, pipes, ditches, vaults, ponds, bioswales and more
• Privately owned storm drains, pipes, ditches, vaults, ponds, bioswales and more
• Areas served by our stormwater system that drain to surface waters like our streams, rivers, lakes and Puget Sound
• Outfall points where our stormwater system drains directly to surface waters
• Connections between our system and other municipalities stormwater systems
• Connections from the City’s stormwater system to privately-owned stormwater systems
• Tree canopy
• Overburdened communities

We use mapping information to understand:

• Where stormwater is being collected and where it is going
• Areas that would benefit from increased stormwater management and habitat enhancement
• How and where tree canopy enhancement can help reduce stormwater issues throughout the city
• High priority areas for street sweeping to reduce flooding and remove pollution