SPU DWW Mainlines is a Group Layer containing all Lifecycles, Ownerships, and other variations of Drainage and Wastewater Mainlines. The Connected Mainlines are symbolized differently in two different layers, one displaying the Permitted Use of the pipe and another displaying the Probable Flow.Permitted Use describes the intended use of the pipe, including Sanitary, Combined, or Drainage flows. Probable Flow takes into account upstream pipes and makes an assumption on the type of flow within the pipes.Proposed Mainlines are planned but not yet installed or as-built.SPU DWW Aba Rem Mainlines refers to Abandoned and Removed Mainlines.Force Mainlines are Mainlines under pressure. Detention Lines and Polygons refer to Mainline Detention Infrastructure.The data is refreshed weekly and is maintained by the SPU GIS Data Maintenance Team.

The polygons are intended for use by the City of Seattle as planning-level tool for a preliminary understanding of the drainage patterns in particular areas of the City. The layer is not complete and does not reflect any City determination about how specific locations should be characterized. Drainage Basins areas were delineated using topography, roads and utility infrastructure based on current GIS data, 200-foot scale maps, side sewer cards and engineering design documents. Data source is DWW.drainage_basin_plgn_pv. Labels are based on the attribute NAME.Refreshed weekly.

The DWW (Drainage and Waste Water) GSI (Green Stormwater Infrastructure) layer consists of line and polygon representations of the following features: Swales (biofiltration, bioretention, biofiltration/bioretention, and conveyance) are generally shallow depressions with a designed mix of soil and plants which break down pollutants through natural processes while reducing runoff. Permeable pavement is a paving system which allows rainfall to percolate into an underlying soil or aggregate storage reservoir. Underdrain piping systems are provided to prevent prolonged ponding of stormwater or to collect and convey water to another facility. Rain gardens are less engineered systems that are designed to mitigate water from the sidewalk only and have two inches or less of ponded depth. The drainage structures represented in the GSI points are not all unique to GSI, however, they are specifically part of SPU GSI projects.The data is being refreshed weekly.

Active, proposed, abandoned and removed 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.Refreshed weekly.

Incorporated in February 1990, the City of SeaTac is located in the Pacific Northwest, approximately midway between the cities of Seattle and Tacoma in the State of Washington. SeaTac is a vibrant community, economically strong, environmentally sensitive, and people-oriented. The City boundaries surround the Seattle-Tacoma International Airport, (approximately 3 square miles in area) which is owned and operated by the Port of Seattle. For additional information regarding the City of SeaTac, its people, or services, please visit https://www.seatacwa.gov. For additional information regarding City GIS data or maps, please visit https://www.seatacwa.gov/our-city/maps-and-gis.

AbstractRats are abundant and ubiquitous in urban environments. There has been increasing attention to the need for evidence-based, integrated rat management and surveillance approaches because rats can compromise public health and impose economic costs. Yet there are few studies that characterize rat distributions in sewers and there are no studies that incorporate the complexity of sewer networks that encompass multiple sewer lines, all comprised of their own unique characteristics. To address this knowledge gap, this study identifies sewer characteristics that are associated with rat presence in the city of Seattle’s urban sewer system. We obtained sewer baiting data from 1752 geotagged manholes to monitor rat presence and constructed generalized additive models to account for spatial autocorrelation. Sewer rats were unevenly distributed across sampled manholes with clusters of higher rat presence at upper elevations, within sanitary pipes, narrower pipes, pipes at a shallower depth, and older pipes. These findings are important because identifying features of urban sewers that promote rat presence may allow municipalities to target areas for rat control activities and sewer maintenance. These findings suggest the need to evaluate additional characteristics of the surface environment and identify the factors driving rat movement within sewers, across the surface, and between the surface and the sewers. , MethodsData was collected in the port city of Seattle, Washington USA (47.6°N, 122.3°W) between February 2016 and September 2019 as a part of Seattle’s ongoing rat sewer baiting program. In the baiting program, manholes across the city were geotagged in map grids, where all grids in one zone were baited before moving to the next zone. The method for monitoring a manhole includes an initial assessment with four non-toxic Talon Weather BlocTM bait blocks. Blocks were suspended from the manhole so that they hung just above the sewer surface. Bait consumption was measured 10 days after the initial visit to monitor rat presence. Rats were considered present in manholes if some bait was consumed and/or signs of rodents (e.g., rodent gnaw marks, rat droppings) were observed. Data regarding the consumption of non-toxic bait (rats were considered either present or absent in each manhole) were joined with three publicly accessible municipal datasets. These datasets included 10 manhole characteristics (point features), 21 sewer line characteristics (line features), and 2 surface characteristics. Two weather characteristics, temperature (average monthly temperature) and precipitation (cumulative monthly precipitation), were obtained from the Western Regional Climate Center and Seattle Weather Blog., Usage notesWe used RSudio (version 1.3) for statistical analyses and ArcGIS Pro (version 2.6.0) for spatial analyses.

Active, proposed, abandoned and removed 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.Refreshed weekly.

SPU DWW Mainline Points is a Group Layer containing all Lifecycles, Ownerships, and other variations of Drainage and Wastewater Mainlines Points.Proposed Mainline End Points are planned but not yet installed or as-built.SPU DWW Aba Rem Mainline End Points refers to Abandoned and Removed Mainline End Points.Force Mainline End Points are Mainline End Points under pressure. Detention Lines and Polygons refer to Mainline End Points for Detention Infrastructure.DWW Mainline Connection Points Wyes refer to side sewer and lateral connection points on mainlines.The data is refreshed weekly and is maintained by the SPU GIS Data Maintenance Team.

This layer displays all the catch basins, catch basin grated tops, sandboxes, junction boxes, inlets and trash racks within the City of Seattle (and the former service area north of the City limits) regardless of ownership.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. 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. Trash racks are grated structures that collect debris. Trash racks may be on maintenance holes, catch basins, other structures, or streams.Data source is DWW.catch_basin_pt_pv, and DWW.APPURTENANCE_PT_PV. Maintained by SPU GIS DWW Data Maintenance staff. This layer does not display when zoomed out beyond 1:899.Refreshed daily.

Ballard was a city separate from Seattle until 1907, and had its own street names. Most well known is Broadway, the old name for Market Street, but every street had a different name.This table includes all of the street names platted in Ballard as denoted in teh 1905 Sanborn fire insurance map and 1903 sewer line map 1588 at the city of seattle. In keeping with the 1895 street rename table, the "From" column indicates the one end of the street in the old street grid, and "To" is another old street name or location that the street ended.

Surface drainage points are structures that help direct rainwater in the City’s sub-surface pipe drainage system. The informal drainage system makes up nearly one-third of the City of Seattle footprint. This layer displays connected surface drainage points, regardless of ownership, that cannot be found in other layers. For example, Catch Basins, Junction Boxes, Sandboxes, and Inlets are not included. The data source is DWW.surface_drainline_pt_pv with the following data query: SDP_LIFECYCLE_TEXT IN ( 'Connected' , 'Unknown' , 'Temporary' ,'To Be Connected', 'Under Construction', 'Provisionally Connected', 'Proposed', 'Abandoned', 'Abandoned Temporary', 'Removed') AND SDP_FEA_TYPE_TEXT IN ( 'Area Drain;Area Way;Driveway Drain' ,'Cleanout', 'Flow Control MH' , 'Infall' , 'Maintenance Hole' , 'Overflow MH' , 'Other' , 'Rubber Coupler' , 'Reducer' , 'Surface Cleanout' , 'Sedimentation Chamber;Sand Catcher;Sand Trap' , 'Stand Pipe' , 'Weephole', 'Catch Basin MH', 'Vault', 'Underground Injection Cell; Drilled Drain')This layer does not display when zoomed out beyond 1:2,000. Labels are based on the attribute SDP_ASSET_ID and only display when zoomed in to 1:1,000 or closer. Only SPU owned assets will have a label.Refreshed weekly.

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

Displays the data from DWW.ditch_culvert_ln_pv with the following query, DCH_LIFECYCLE_CODE IN ( 'C' , 'UNK' , 'T', 'TBC', 'U', 'PC' ) And DCH_FEATYPE_CODE IN ( 'CDC' , 'CRB' , 'SDR' , 'UNK' ). The layer is symbolized on the attribute SYMBOL. Labels are based on the attribute DCH_OWNER_NAME. This layer will not display when zoomed out beyond 1:7,000. Maintained by SPU GIS DWW Data Maintenance staff.Refreshed weekly.

Easements on Seattle Parks and Recreation owned properties or Easements relating to Seattle Parks and Recreation. Easement Types includes: Conservation, Access, Utility, Drainage and Wastewater, Driveway, Retaining Wall, Seawall.The SPR Easements Layer information is not complete or current. Use with caution.

Proposed drainage, sanitary, and combined mainlines. 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

For use in SPU CIP App, as well as DotMaps.Data refreshed daily.

Non-active secondary sewer and storm pipes that are not part of the mainline system (i.e. side sewers, service drains, etc.) or locations where these pipes were formerly present. 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. Probable flow is the derived use classification based on what is the best estimation of usage broken out by Drainage and Sanitary

Designed 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, sanitary, and combined.

This layer indicates which areas contribute sanitary and storm water flow to a CSO overflow point. Areas are broken down by NPDES Outfall Number. The data source is DWW.cso_basin_plgn_pv. The layer continues to be updated as new information about the CSO system becomes available and as modifications to the system are completed. The boundaries in this layer were created and updated for purposes of developing a hydrologic and hydraulic computer model. The model was used to estimate CSO control volumes and develop CSO control alternatives. Estimation of control volume and alternative analysis did not require a parcel level of detail, so it is expected that the boundary is not always correct at the parcel level. In addition, the CSO basin boundary shapefile reflects both the sewer basin AND the drainage basin tributary to the overflow point, and these two basins do not always line up cleanly. This layer reflects the best compromise between the two boundaries.Updates as needed.