WSDOT - Stormwater Flow Restrictor - Office

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 IS NULL OR SWLocationVerified = 'No') 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.

本数据集为基于下述查询语句生成的FlowRestrictor要素类（FlowRestrictor featureclass）视图：查询条件为LifeCycleCurrentStatus='Active'，且（WSDOTownership取值为'Yes'或'Unknown'，或WSDOTownership为空值），且（SWLocationVerified为空值或SWLocationVerified='No'）。该要素类包含华盛顿州运输部（WSDOT）的雨水流量限制装置。流量限制装置是指诸如孔板或堰一类的设施，用于限制构筑物通流通道或出水口处的雨水径流量。该装置可作为“流量限制系统”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处于2009年NPDES市政雨水许可区域的第一阶段与第二阶段覆盖范围内。