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<br />BASIN MAP <br />. The drainage basin was divided into six sub-basins for the hydrologic analysis for the <br />Sulphur Creek Basin. The sub-basins were determined by their respective drainage <br />characteristics and runoff patterns. USGS quad sheets for the basins were used for making <br />these determinations. The basin drainage and its sub-basins are shown in Exhibit No. 1. <br />The drainage areas for each sub-basin are presented in Table ill. <br />TABLE ill <br />SULPHUR CREEK BASIN <br />SUB-BASIN DRAINAGE AREAS <br /> <br />Sub-Basin No. <br />I <br />II <br />ill <br />IV <br />V <br />VI <br /> <br />Drainage Area <br />6.3 <br />7.1 <br />2.9 <br />1.1 <br />3.4 <br />1.4 <br /> <br />FIELD REVIEWS <br /> <br />. Field inspections were conducted by the CWCB staff in consultation with the USDA <br />Soil Conservation Service, Meeker, Colorado area office. During these field inspections the <br />vegetative cover was studied; drainage patterns noted; grazing habits noted; and channel and <br />valley cross sections obtained. These basin characteristics were essential parameters for the <br />development of a hydrologic rainfall-runoff model. <br /> <br />HYDROLOGIC ANALYSIS <br /> <br />Following a review of rainfall-runoff models and regional methods, the CWCB <br />selected the USDA, SCS computer program TR-20 which was run on an in-house PC for <br />the analysis. The hydrologic analysis was undertaken to determine peak discharges for the <br />10, 25, 50, and 100-year flood frequencies. <br /> <br />. <br /> <br />6 <br />