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In~tructions <br />1. Delineate the watershed boundaries on an appropriate watershed base map. <br />2. Trace the paths of the major watercourses in the watershed on the base map. <br />3. If the watershed has more than one physiographic type, define the areas of the <br />different types: <br />Rocky Mountain <br />Great Plains <br />Colorado Plateau <br />Agricultural <br />Urban <br />4. Determine whether the watershed can be treated as a single, hydrologically <br />homogeneous watershed, or if it must be divided into modeling subbasins. This <br />decision should consider the following factors: <br />• topography (and watercaurse) <br />• land-use, <br />• diversity of soil texture, <br />• occurrence of rock outcrop, <br />• existence of drainage and flow control structures within the watershed <br />(detention/retention basins, elevated highway cross-drainage structures, <br />channelized and improved watercourses, etc.), and <br />• shape of watershed. <br />5. If the watershed is to be divided into modeling subbasins, use the information from <br />Steps 2, 3, and 4 to delineate the subbasin boundaries. <br />6. For the watershed or each modeling subbasin, determine the following: <br />A - area, in square miles <br />L - length of the flow path to the hydraulically most distant point, <br />in miles <br />L.~ - length along L to a point opposite the centroid, in miles <br />S - average slope of L, in ft/mile <br />19 Marh 2007 25 <br />