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<br />feet (2,300 meters). To illustrate the use of regression techniques, a <br />relatively homogeneous basin in one part of the foothill region, the South <br />Platte River basin, was selected. Streamflow and basin characteristics are <br /> <br />shown in Table 1 for 27 sites in the study area. <br /> <br />Conceptually in the foothill region, although there can be intense <br /> <br /> <br />rainstorms above 7,500 feet (2,300 meters), rainfall intensities are <br /> <br /> <br />relatively low and of very limited areal extent so rainfall runoff <br /> <br /> <br />generally is less than snowmelt runoff. Analysis of flood records indi- <br /> <br /> <br />cated that for two basins located in the foothill region, a large basin <br /> <br /> <br />that has its headwaters at the Continental Divide and a small basin in <br /> <br /> <br />which all drainage is below 8,000 feet (2,438 meters), as hypothetically <br /> <br /> <br />shown in Figure 7, the rainfall runoff would be approximately the same if <br /> <br /> <br />the large basin has the same amount of drainage area below 8,000 feet <br /> <br /> <br />(2,438 meters) as the lower elevation basin. Only that part of the large <br /> <br /> <br />basin below 8,000 feet (2,438 meters) would contribute significantly to <br /> <br /> <br />rainfall runoff. In most cases, the rainfall flood characteristics are the <br /> <br />same as the composite flood characteristics (eq. 1) and therefore can be <br /> <br />used to develop regional flood characteristics. <br /> <br />Yt <br />