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. PURPOSE FOR THE STUDY The Sulphur Creek Hydrology Study was performed by the Colorado Water Conservation Board (CWCB) to address a number of concerns which have been expressed by officials for the Town of Meeker, Colorado. These concerns resulted from findings in the preliminary design phase for the "Sulphur Creek Flood Control Project" at Meeker, Colorado. At the request of the officials in Meeker and Rio Blanco County, Colorado, the CWCB initiated the evaluation of the Sulphur Creek Basin hydrology on January 2, 1992. SCOPE OF INVESTIGATION . An investigation was proposed that would review existing, related basin studies; evaluate the hydrologic parameters for the basin; and select an applicable hydrologic analysis procedure/method. No stream gage records exist for Sulphur Creek. Therefore, the investigation should be performed under a regional analysis or a synthetic rainfall-runoff model procedure/method. In addition, the basin is a rural, agricultural one; therefore, the USDA Soil Conservation Service TR-20 Computer Program for Project Formulation was determined to be an applicable model for use given the basin conditions in Rio Blanco County, Colorado. DESCRIPTION OF STUDY BASIN The Sulphur Creek drainage basin extends about 10 miles north of Meeker; averages about 3 miles in width; and is 22.2 square miles in area. It rises from 6800 feet at the town's north boundary to elevations above 8000 feet at the upper end of the watershed. The ground cover is primarily sage and oak brush with some aspen, juniper and pinon at higher elevations. There is also some crop and grazing land in the valleys. Cover conditions range from good in the upper reaches of the watershed to fair-poor in the lower reaches. Sulphur Creek has one major tributary, Four Mile Gulch, which drains about one- . fourth of the basin.