WSDOT - Stormwater Flow Restrictor - Field

This is a view of the FlowRestrictor featureclass created with the following query: LifeCycleCurrentStatus= 'Active' AND (WSDOTownership in ('Yes', 'Unknown') OR WSDOTownership IS NULL) AND SWLocationVerified = 'Yes' This feature class contains WSDOT’s stormwater flow restrictors. A flow restrictor is a device such as an orifice or weir that restricts the volume of stormwater flow through or at the outlet of a structure. It may be associated with a “control structure” as part of a “flow restrictor system” (see Standard Plans B-10.40, B-10.60). The majority of the data collected so far are within the Phase I and Phase II 2009 NPDES Municipal Stormwater Permit Areas.

本数据集为通过下述查询语句创建的FlowRestrictor要素类（FlowRestrictor featureclass）：LifeCycleCurrentStatus='Active' 且（WSDOTownership 取值为'Yes'、'Unknown' 或 WSDOTownership 为空）且 SWLocationVerified='Yes'。该要素类包含华盛顿州运输部（Washington State Department of Transportation, WSDOT）的雨水流量限制器。流量限制器是一类可限制构筑物内部或出水口处雨水径流量的装置，例如孔板、堰坝；该装置可作为“流量限制器系统”的组成部分与“控制构筑物”相关联（详见标准图纸B-10.40、B-10.60）。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（National Pollutant Discharge Elimination System, NPDES）市政雨水许可区域的第一、二期范围内。