Open Watercourses

(Storm water Open Watercourses (OWC): rivers identification information) The status of the official Open Watercourse layer is representative of natural and built river systems, which integrates surface storm water runoff into underground urban drainage reticulation, from upstream mountain intakes to coastal outfalls. Rain-water is routed along natural flow paths, via environmental wetland eco-systems and artificial storm detention/retention depressions, through existing streams and tributaries of the bulk open natural and built-infrastructure river systems. The Open Watercourses are intercepted by Inlet-Outlet infrastructure, which deposits storm water urban runoff into underground storm water drainage reticulation networks, then converges with the road drainage runoff taken into catch pits from road surface channels into the underground reticulation, by means of the above open/closed systems, towards coastal outfalls. (OWC: spatial vector / non-spatial (attribute or tabular) / spatial extents)Open Watercourse river reaches are comprised of feature types such as Natural Rivers, Streams, Channels, Canals, Overland Flow Paths/Gap Connectors and Stream Extensions. The spatial coverage of Open Watercourses of the greater Cape Town Drainage Catchment area includes all rivers within the catchments, which drain into but also extend outside the Cape Town metro area. All spatial layers are served live from internal systems, an item's "Last Updated" or "Publish Date" refers to the Metadata only.（雨水开放水道（Open Watercourses，缩写OWC）：河流识别信息）官方开放水道图层的现状表征了自然与人工河网系统，该系统将地表雨水径流整合纳入城市地下排水管网，覆盖范围从上游山地取水口延伸至沿海排放口。雨水沿自然流动路径输送，途经湿地生态系统与人工雨水滞留/调蓄洼地，流经现有河道以及大型开放型自然与人工基础设施河网的支流。开放水道通过进出口基础设施截流，将城市雨水径流汇入地下雨水排水管网；随后与路面排水径流汇合——路面径流经由路面渠道汇入雨水篦子，进而进入地下管网。通过上述开放/封闭系统，水流最终流向沿海排放口。（OWC：空间矢量数据/非空间（属性或表格）数据/空间范围）开放水道河段包含自然河流、溪流、渠槽、人工运河、坡面流路径/间隙连接器以及河道延伸段等要素类型。大开普敦流域汇水区的开放水道空间覆盖范围涵盖该汇水区内所有河流，这些河流既向开普敦都会区排水，也延伸至都会区之外。所有空间图层均由内部系统实时提供服务，要素的“最后更新时间”与“发布日期”仅指元数据的更新与发布时间。