Description: The Parcels data set is a thematic layer depicting current real property parcel boundaries within Snohomish County, Washington based on the legal descriptions contained in the assessment roll. Parcels in this data set are defined as real property entities that can be valued for the purpose of collecting taxes. Parcels include, but are not limited to land, buildings on leased land, mobile homes and condominium units. Parcels may overlap. Parcels such as condominium units and mobile homes that may occupy a single polygon are represented as non-planar features (regions) of the same geographic extent. The Parcels data set does not depict legal ownership boundaries nor does it represent legal building lots. Snohomish County does not maintain parcels for the complete geographic coverage of the county. There is no parcel fabric in much of the eastern mountainous area.
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Features in this layer represent the end points of linear features such as culverts, ditches and pipes or the center points of features such as access roads, detention ponds, and vaults. They are used to help create these features during the Drainage Inventory process.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Catch basins are storm water features designed to catch and store water, or to aid water in infiltration and filtration. Catch basins are mapped to allow for inspection and maintenance as part of Snohomish County's National Pollutant Discharge Elimination System (NPDES) permit. </SPAN></P></DIV></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Closed detention features are designed to retain storm water and allow outflow over time. </SPAN></P><P><SPAN>They mapped to allow for inspection and maintenance as part of Snohomish County's National Pollutant Discharge Elimination System (NPDES) permit. </SPAN></P></DIV></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Culverts are pipes that allow for the flow of storm or natural water under roads and driveways. Some culverts are designed specifically to mimic natural streambed conditions to allow for passage of migratory fish. They are mapped to allow for inspection and maintenance as part of Snohomish County's National Pollutant Discharge Elimination System (NPDES) permit. </SPAN></P></DIV></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:1 1 1 0;"><SPAN>Storm water pipes transport storm water between storm water structures such as vaults, catch basins, and ponds. The connection to a storm water structure is what distinguishes pipes from culverts. Pipes are mapped to allow for inspection and maintenance as part of Snohomish County's National Pollutant Discharge Elimination System (NPDES) permit.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>An energy dissipator is a storm water feature typically found at the end of a ditch or pipe. It is designed to dissipate the flow of water to prevent scouring and erosion of earth at the end of a drainage system and is typically made from a hard material such as concrete or stone. They are mapped to allow for inspection and maintenance as part of Snohomish County's National Pollutant Discharge Elimination System (NPDES) permit. </SPAN></P></DIV></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>A facility access feature is generally a paved surface that allows for a maintenance vehicle to access other storm water infrastructure such as ponds and vaults.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Fences in this layer are typically located in drainage facilities. Fences are mapped to allow inspectors to know when a key is potentially needed to access a facility for inspection. </SPAN></P></DIV></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN>A media filter structure is a storm water basin or vault that contains filtration media. Its intended purpose is to filter out pollutants from storm water than enters the structure. These are mapped to allow for inspection and maintenance as part of Snohomish County's National Pollutant Discharge Elimination System (NPDES) permit. </SPAN></P></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN>This layer represents non-asset linear storm water features, or features that are represented in the County's asset maintenance system as a different geometry type. Features can include undirected flow (Flow Line), streams, or linear representations of areal features such as bioswales and detention pipes.</SPAN></P></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Open channels include ditches, infiltration ditches, and swales. They convey water from the roadside or from pipe system outlets, and are typically composed of natural materials such as earth, grass, or rock. They are mapped to allow for inspection and maintenance as part of Snohomish County's National Pollutant Discharge Elimination System (NPDES) permit. </SPAN></P></DIV></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN>Overflow control structures are typically found in detention systems and can include pond cell dividers, spillways, and weirs. Their function is to allow for the escape of water from a detention facility that has reach capicity, or for the regulation of water flow from a normally functioning facility. </SPAN></P></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN>Permeable pavement is pavement that allows for rainwater to permeate the surface with minimal runoff. Permeable pavement can be found in parking lots, roads, and sidewalks. It is mapped to allow for inspection and maintenance as part of Snohomish County's National Pollutant Discharge Elimination System (NPDES) permit. </SPAN></P></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
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(2285)
Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN>Poly perimeter points are surveyed in order to construct a polygonal drainage feature or a linear fence feature. This is done when aerial imagery is unsuitable for manual digitization of the polygonal feature.</SPAN></P></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN>Detention and infiltration ponds are intended to store or infiltrate, respectively, storm water that enters them. Ponds are mapped to allow for inspection and maintenance as part of Snohomish County's National Pollutant Discharge Elimination System (NPDES) permit.</SPAN></P></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN>Water quality features are designed to infiltrate and filtrate storm water that enters them, typically through layers of natural material. Examples include bioswales, bioinfiltration cells, filter strips, and constructed wetlands. These are mapped to allow for inspection and maintenance as part of Snohomish County's National Pollutant Discharge Elimination System (NPDES) permit. </SPAN></P></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN>Xsections are surveyed points that are intended to provide a cross-sectional view of a part of a storm water feature such as a ditch. They are also used in a similar way to Auxiliary_pt in aiding with the creation of linear open channel features. </SPAN></P></DIV></DIV>
Copyright Text: Snohomish County Surface Water Management
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