MS4_RMAs
<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>These are the drainage boundaries which correspond to the MS4 Major Outfall Inventory, 2017-10-02 version for the Upper Santa Margarita River Watershed region within Riverside County and will be used to meet the compliance requirements of Order No. R9-2013-0001 as amended by Order No. R9-2015-0001 and Order No. R9-2015-0100 (San Diego Regional MS4 Permit).</SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN>The drainage boundaries were created using the ArcMap Watershed tool. The end result is an approximation of the MS4 drainage boundaries. Due to situations where an underground facility may convey flow contrary to the topography, discrepancies may occur . The inputs to Watershed were created as follows:</SPAN></P><UL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>The DEM which was used to create the flow direction and flow accumulation rasters as an inputs in the Watershed tool was created by: </SPAN></SPAN></P><OL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Exporting the Inroad DTMs (Q:\SMR Watershed Boundary), provided by the Survey and Mapping Division, corresponding to 220 sections within the Santa Margarita watershed to random point text-files. The focus area of the delineation only included areas downstream of Vail Lake and Lake Skinner. </SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Converting the text-files to point shapfiles, with an attribute representing elevations. </SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Interpolating each of the point-shapefiles to DEMs by section using the ArcMap TopoToRaster tool. Stream feature lines were provided as an input to TopoToRaster based on a combination of reviewing MS4 Facility lines, aerial imagery (District and google earth), and District ortho-maps. </SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>The DEMs were stitched together using the Raster Catalog to Raster Dataset tool with the blend option. Mosaic to New Raster tool with the blend</SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>“Walls” were “burned” onto the DEM to clean up boundaries, and prevent situations were calculated flow paths (from flow accumulation raster) may jump physical barriers such as curbs walls, or collector channels.</SPAN></SPAN></P></LI></OL></LI><LI><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>The pour points were based on the ms4 outfall inventory.</SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>The raster output of the Watershed tool was processed using the Boundary Clean and Nibble tool, to eliminate clusters of isolated drainage areas, by absorbing extremely small areas into adjacent larger ones. </SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>The processed raster is converted to a polygon.</SPAN></SPAN></P></LI></UL><P><SPAN /></P></DIV></DIV></DIV>
[]
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[{'name': 'R577_pk', 'fields': 'OBJECTID', 'isAscending': True, 'isUnique': True, 'description': ''}, {'name': 'S555_idx', 'fields': 'Shape', 'isAscending': True, 'isUnique': True, 'description': ''}]
[]
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