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County, and residential development is occurring at a rapid pace. Significant portions of this part, of the county are zoned residen- , tial, and planned developments are numerous. The study area is in the South Pl~tte River watershed. The study areas of the South platte River, ~orse Creek at Deckers, and West Creek are within the Pike National Forest. All of the other study areas are portions of two subbasi~s, plum Creek and Cherry Creek. East Plum Creek originates in pike National Forest and joins West plum Creek near Sedalia. Plum Creek flows northerly and joins the South Platte River at Chatfield L~ke. Cherry Creek, located in the eastern part of the county, flows northerly through Arapahoe County; to its confluence with the South platte River in Denver. ' Plum Creek, with a drainage area of approximately 319.0 square miles, perennially discharges into Chatfield Lake. The detailed- study area includes 10 miles of stream that flow northwesterly through Sedalia and Louviers. La~d use plans (Reference 2) indi- cate that the Plum Creek watershed primarily covers farmland, with I residential development planned fpr Sedalia and Louviers. Indian Creek, draining an area of: approximately 16.7 square miles, perennially flows northeasterly through Douglas County. The detailed-study area includes 1.5 ~les of channel at the Indian Creek Subdivision, approximately 3.5 miles upstream from its con- fluence with Plum Creek south of Louviers. West Plum Creek flows northerly fFom Perry Park to its confluence with Plum Creek at Sedalia. Westiplum Creek, which is a perennial stream, drains approximately 27.7: square miles of farmland. The main developed area along the 3.0~mile length of detailed study is Perry park. East Plum Creek, near the Town of, Larkspur, drains an area of approximately 63.2 square miles. 'It meanders to the north through Douglas County, passing through t~e Town of Castle Rock, before joining West Plum Creek at Sedali~. The detailed-study area in- cludes 21.5 miles of perennial st~eam that drain residential areas as well as farmland. Hangmans Gulch, with a drainage a~ea of approximately 1.3 square miles, flows northwesterly througp a residentially zoned area of Castle Rock. The detailed-study area includes 2.0 miles of ephem- eral stream. Approximately 0.4 mile north of town, Hangmans Gulch joins East plum Creek. i Sellers Gulch, draining 15.5 squa~e miles of sparsely developed residential land southeast of Cas~le Rock, flows northwesterly and joins East Plum Creek upstream ofi the Interstate Highway 25 bridge 6