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south of the Town of Parker. The entire area through which Sulphur Gulch flows is planned for residential development. Tallman Gulch, draining an area of approximately 6.1 square miles, flows northwesterly through Douglas County. The detailed-study area is fram the confluence with Sulphur Gulch 3.0 miles upstream through residen- tially zoned land. Bayou Gulch, draining an area of approximately 22.5 square miles, flows northwesterly through Douglas County. The study reach extends from the confluence with Cherry Creek to a point 4.0 miles upstream. The Bayou Gulch drainaqe area is predominantly agricultural land. South platte River and Horse Creek, both at Deckers, are located in Pike National Forest. The South Platte River drains an area of approximately 2,018 square miles, and Horse Creek drains roughly 211 square miles. The detailed-study areas include 1.4 square miles of the South Platte River and 0.7 mile of Horse Creek. Horse Creek perennially flows northwesterly before it joins the South Platte River at the Douglas-Jefferson County line. West Creek, draining an area of approximately 61.3 square miles, flows northerly and discharges into West Creek Lake. The study area includes 1.5 miles of perennial stream located in Pike National Forest, approximately 3.5 miles upstream from its con- fluence with Horse Creek. The detailed-study area is planned for residential development and recreation. The climate of the plains area of the county is high, inland continental, modified by the Rocky Mountains immediately to the west and Palmer Lake Divide to the south. preCipitation is light, with an annual average of 15 to 18 inches. Totals vary substantially for individual years because a large part of the yearly total is from sUDlller thunderstorms. Temperatures in the area range from a high of sliqhtly more than 100*F to a low of approximately -35*F. The mean annual air temperature is 47*F, and the mean SUDlller air temperature is 66*F. The northern one-half of the plains area of the county consists of three basic soil types. Loamy and sandy soils exist on the flood plains and terraces. Terrain in these areas is nearly level to gently slopinq to moderately steep, with sandy and gravelly soils on the uplands. Vegetation is mainly grass, with SOllIe Gambel oak, mountain mahogany, and ponderosa pine trees (Reference 3). Most of the remaining area is qently slopinq to moderately steep, with loamy soils on the uplands. The southern portion of the plains area is qently sloping to steep, with sandy soils on the uplands and loamy soils on the tablelands. Vegetation on the uplands is mainly mid-size and tall 8