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<br />~ <br /> <br />I <br />I <br />II <br />'I <br />,I <br />II <br />:1 <br />I <br />'I <br />'I <br />I <br /> <br />~I <br /> <br />HYDROLOGIC PROCEDURE <br /> <br />SWM~I Model <br /> <br />The Sl'iMM model, a very detailed hydrologic computer program, <br /> <br />was selected for use in this study because of the nature of <br /> <br />the project (a project that may lead to the expenditure of <br /> <br />capital funds) and because of the complexity of the basin. <br /> <br />The procedures for use of this model are discussed in the <br /> <br />following paragraphs. <br /> <br />Model Setup <br /> <br />I <br /> <br />II <br />:1 <br />!I <br />I <br />I <br />, <br />II <br />I <br />jl <br />III <br /> <br />! <br /> <br />The Dry Creek drainage basin was delineated on the U. S. <br /> <br />Geological Survey 7.5-Minute Quadrangle maps at a scale of <br />I" = 2,000' (Reference 10) (Figure 2). The Park Creek Reservoir <br /> <br />was added to the maps from aerial photography. The basin was <br /> <br />then divided into 190 sub-basins draining into 139 channel <br /> <br />sections. Basins were selected so that hydrographs would be <br /> <br />available at critical design points, particularly at irrigation <br /> <br />canal crossings and at on-stream reservoirs. A time increment <br /> <br />of five minutes was selected for computation of the hydrographs <br /> <br />and basin sizes were determined accordingly so that travel times <br /> <br />, , ,: . < ~ . <br />..;,.:I\;j~~ '. <br />