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The Western Washington Stormwater Mangement Manual allows local governments to adopt a flow control standard that requires land development projects to match high flow durations that are produced by the existing land cover condition. As pre-requisite to allowing that standard, the manual recommends that the drainage area of the immediate stream and all subsequent downstream basins must have had at least 40% total impervious area since 1985. To help implement this option, the Department of Ecology has produced a map that displays the basins in western Washington within which development projects potentially qualify for this lower flow control standard. |
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The Western Washington Stormwater Mangement Manual allows local governments to adopt a flow control standard that requires land development projects to match high flow durations that are produced by the existing land cover condition. As pre-requisite to allowing that standard, the manual recommends that the drainage area of the immediate stream and all subsequent downstream basins must have had at least 40% total impervious area since 1985. To help implement this option, the Department of Ecology has produced a map that displays the basins in western Washington within which development projects potentially qualify for this lower flow control standard. |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The shapefile displays those basins within which development projects potentially qualify for using the existing land cover condition as the stormwater flow control default target. This is a lower flow control default target than the target used for most of western Washington, which is based upon use of the historic land cover condition.</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>No use constraints exist at this time.</SPAN></P></DIV></DIV></DIV> |
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Western Washington Land Cover Change Analysis Project - Basins 1991 |
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["Washington State Department of Ecology","ECY","Water Quality Program","IBM","imageryBaseMapsEarthCover","control","basin","Washington","stormwater","northwest","landcover","flow"] |
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150000000 |
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