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DWW WQ_SPILLS presents point data from the SPU Source Control Team’s database.
There are two main types of inlets: side inlets and grated inlets. Side inlets are located adjacent to the curb and rely on the ability of the opening under the curb to capture flow. Grated inlets have gratings or metal grids to prevent large objects and debris from falling into the combined sewer or drainage system. They collect surface runoff for conveyance in a pipe system.
Sandboxes have wooden lids and are filled with sand or gravel and drain directly into the ground or to a culvert as part of the informal drainage system. Sandboxes are no longer being installed. Junction boxes are cement structure with a grated metal lid, shallow in depth, generally connect culverts and are inline as part of the informal ditch and culvert system.
A catch basin is a connector to the storm drain system that typically includes an inlet where stormwater enters the catch basin and a sump to capture sediment, debris, and associated pollutants prior to the surface water flowing into a storm or sewer pipe.
Curbs are made from concrete and have a small gutter or depression to direct surface water. A gutter is a depression running parallel to a road designed to collect rainwater flowing along the street and divert it into a storm drain or other drainage structure. Generally curb and gutter is found with formalized drainage where surface water flows to mainlines via catch basins and inlets.
Ditches are small to moderate depressions that are created to channel water. Culverts are pipes that are open on both ends that conduct water under a road or railway.
Active secondary sewer and storm pipes that are not part of the mainline system (i.e. side sewers, service drains, etc.). Side Sewers are wastewater pipes from buildings and establishments that connect to mainline pipes. Service drains are stormwater pipes from buildings that connect to mainline pipes. Probable flow is the derived use classification based on what is the best estimation of usage broken out by drainage and sanitary.
This layer displays all connected or to be connected drainage, sanitary, and combined mainline pipes within the City of Seattle (and the former service area north of the City limits) regardless of ownership and not including detention systems. Probable flow is the derived use classification based on what is the best estimation of usage broken out by combined sewer, drainage, and sanitary. A combined sewer is a type of sewer system that collects sanitary sewage and stormwater runoff into a single pipe system. A sanitary sewer is a type of underground system for transporting sewage . A drainage system transports waste water from buildings and water run-off from streets.
Perennial and intermittent natural surface water flow identified and recognized as a watercourse by the Seattle Public Utilities.
Smaller areas within creek watersheds or drainage basins that more granularly delineate flow areas over impervious surfaces, ditch/culvert systems or small private drainage systems.
Basin areas such as Puget Sound that receive drainage from a public storm drain outfall (drainage basin), creek mouth (creek watershed) or flow over impermeable surfaces (direct drainage).