Description: 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.
This layer displays all the sandboxes and junction boxes within the City of Seattle (and the former service area north of the City limits) regardless of ownership. Selected Maximo data are included. The data source is DWW.catch_basin_pt_pv with the following definition query, CB_LIFECYCLE_CODE IN( 'C' , 'UNK' , 'T' ,'TBC', 'U', 'PC') AND CB_FEATYPE_CODE IN ( 'SB' , 'JB', 'JBS'). The features are symbolized on the attribute CB_FEATYPE_CODE. Labels are based on the attribute CB_ROLE_TYPE. This layerfile does not display when zoomed out beyond 1:899. Refreshed weekly. Maintained by SPU GIS DWW Data Maintenance staff.
Description: 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.
Description: 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.
Description: 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. Permitted use is the allowed use or connection classification for mainline pipes is 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.
Name: Drainage and Wastewater Mainlines (Permitted Use)
Display Field: MNL_OWNER_NAME
Type: Feature Layer
Geometry Type: esriGeometryPolyline
Description: 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. Permitted use is the allowed use or connection classification for mainline pipes is 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.
Description: A presentation feature class displaying the footprint of various structures as described within the descriptive text column of the feature class.
Description: Capacity-constrained is defined by the Stormwater Code, SMC 22.801.040 as “a drainage system that the Director of SPU has determined to have inadequate capacity to carry drainage water". There are three distinct areas that compromise what is currently mapped as capacity-constrained, 1) the entire network comprising the informal drainage system consisting of the intermittent ditch and culvert network – as these were never engineered, they are inherently capacity constrained. 2) The infrastructure contained in the Densmore Basin which discharges to a King County storm drain which was not designed with capacity to convey runoff from the increased density from additional development. 3) a portion of the public storm drain system on Capitol Hill upstream from the maintenance hole at the intersection of Pike St & Melrose Ave, there is a hydraulic restriction in this maintenance hole which leads to an extremely elevated hydraulic grade line and associated localized surface flooding. For more information on this Code please see, http://water.epa.gov/polwaste/nps/upload/nps-ordinanceuments-seattle-code.pdf