Description: This feature class contains WSDOT’s stormwater ponds as points. There are various types of stormwater treatment ponds which provide treatment and flow control by containing excess runoff for a considerable length of time and then releasing it by evaporation, plant transpiration, or infiltration; or holding surface and stormwater runoff for a short period of time and then releasing it to a surface or stormwater management system. Stormwater pond points are located at the midpoint of the pond edge closest to the highway.The majority of the data collected so far are within the Phase I and Phase II 2009 NPDES Municipal Stormwater Permit Areas.
Description: This feature class contains WSDOT’s stormwater vaults.Stormwater vaults include various best management practices with underground storage facilities that treat stormwater for water quality and quantity control. These processes occur by detaining runoff, allowing pollutants to settle out in underground storage units, and then releasing reduced flows at established rate standards.The majority of the data collected so far are within the Phase I and Phase II 2009 NPDES Municipal Stormwater Permit Areas.
Description: This feature class contains WSDOT’s stormwater drainage inlets. A drainage inlet is a chamber or well allowing for the entry of surface runoff to a closed stormwater conveyance system. Inlet type is chosen based upon its hydraulic and interception capacity as well as depth of flow, grade, super-elevation, and placement.The majority of the data collected so far are within the Phase I and Phase II 2009 NPDES Municipal Stormwater Permit Areas.This feature class has eight subtypes: Catch Basin, Concrete Inlet, Drop Inlet, Dry Well, Grate Inlet, Manhole, Other, amd Unknown.
Description: This feature class contains WSDOT’s stormwater ditches.A stormwater ditch is a long, narrow excavation dug in the earth for drainage, having a top width less than 10 feet at design flow. This can include various linear conveyances constructed of rock, gravel, earth, concrete, asphalt, or other material using forms, machinery, etc. It can also include a convergence in gradients of impervious surfaces (e.g., in a parking lot) designed to concentrate and convey stormwater.The majority of the data collected so far are within the Phase I and Phase II 2009 NPDES Municipal Stormwater Permit Areas.
BackSlope
(
type: esriFieldTypeString, alias: BackSlope, length: 30
, Coded Values:
[Vertical: Vertical]
, [Steeper Than 2 to 1: Steeper Than 2 to 1]
, [In Between 2 to 1 and 4 to 1: In Between 2 to 1 and 4 to 1]
, ...1 more...
)
ForeSlope
(
type: esriFieldTypeString, alias: ForeSlope, length: 30
, Coded Values:
[Vertical: Vertical]
, [Steeper Than 2 to 1: Steeper Than 2 to 1]
, [In Between 2 to 1 and 4 to 1: In Between 2 to 1 and 4 to 1]
, ...1 more...
)
Description: This feature class contains WSDOT’s stormwater roadside slopes as lines. The roadside slopes are that are documented by the Stormwater Features Inventory Group are limited to those that are designed and/or approved for use as a stormwater best management practice (BMP), such as vegetated filter strips. A roadside slope line documents the top portion of the slope as it extends along a state route.The majority of the data collected so far are within the Phase I and Phase II 2009 NPDES Municipal Stormwater Permit Areas.
SlopeDescrip
(
type: esriFieldTypeString, alias: SlopeDescrip, length: 40
, Coded Values:
[Vertical: Vertical]
, [Steeper Than 2 to 1: Steeper Than 2 to 1]
, [In Between 2 to 1 and 4 to 1: In Between 2 to 1 and 4 to 1]
, ...1 more...
)
Height
(
type: esriFieldTypeString, alias: Height, length: 30
, Coded Values:
[0 to 5 Feet: 0 to 5 Feet]
, [5 to 10 Feet: 5 to 10 Feet]
, [10 to 15 Feet: 10 to 15 Feet]
, ...3 more...
)