WSDOT - Stormwater Ditch - Field

This is a view of the Ditch featureclass created with the following query: (BMPTypeID IS NULL OR BMPTypeID= '24') AND LifeCycleCurrentStatus= 'Active' AND (WSDOTownership in ('Yes', 'Unknown') OR WSDOTownership IS NULL) AND SWLocationVerified = 'Yes' 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.本数据集为依据以下查询语句创建的沟渠要素类视图：(BMPTypeID 为空 或 BMPTypeID = '24') 且 LifeCycleCurrentStatus = 'Active' 且 (WSDOTownership 包含于 ('Yes', 'Unknown') 或 WSDOTownership 为空) 且 SWLocationVerified = 'Yes'。该要素类包含华盛顿州运输部（WSDOT）所辖的雨水沟渠（stormwater ditch）。雨水沟渠指为实现排水功能而在地表开挖的狭长沟槽，其设计流量下的顶部宽度小于10英尺。此类设施涵盖各类通过模板、机械等工艺修筑的线性输水结构，材质包括岩石、砾石、土体、混凝土、沥青或其他材料；同时也包括不透水面（如停车场）上经设计用于汇集并输送雨水的坡度汇流段。截至目前，所采集的绝大多数数据均位于2009年国家污染物排放消除系统（NPDES）市政雨水许可区域的第一阶段与第二阶段范围内。