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at Castle Rock. The detailed-study area includes 2.7 miles of stream channel. Sellers Gulch and Unnamed Tributary to Sellers Gulch are ephemeral streams. A small, unnamed tributary flows westerly for approximately 1 mile, where it joins Sellers Gulch, approximat~ly 400 feet west of Lake Gulch Road. This tributary drains roughly 1.5 square miles of industrial and residential land. Carpenter Creek drains approximately 22.8 square miles of farm- land. The creek perennially flows northeasterly through Greenland and joins East Plum Creek south of Larkspur. The area encompassed by the detailed study includes 1.5 miles of Carpenter Creek at Greenland. Greenland is zoned for residential development. Cherry Creek, which drains an area of approximately 385 square miles, flows northerly to Cherry Creek Lake in Arapahoe County. The main developed areas along the l6-mile study length of Cherry Creek are Franktown and Parker. The development in this area is predominantly agricultural. Cherry Creek and its tributaries are ephemeral streams. Happy Canyon Creek, which drains an area of 17.2 square miles, originates in the Daniels Park area and flows northeasterly through Douglas County into Arapahoe County, joining Cherry Creek approximately 1.5 miles north of the Douglas-Arapahoe County line. The detailed-study area includes the length of the stream from Grandview Estates to Cherry Creek, approximately 3.5 miles. The area south of Grandview Estates is zoned residential and is rela- tively undeveloped. From north of Grandview Estates to the Douglas-Arapahoe County line. the area is zoned for commercial development. From the Douglas-Arapahoe County line to the con- fluence with Cherry Creek, little or no development exists in what is an agricultural area. Newlin Gulch flows northeasterly to Cherry Creek through Douglas County. Five miles of Newlin Gulch upstream from the confluence with Cherry Creek were studied. It drains an area of approxi- mately 15.0 square miles. The watershed is zoned for residential development, but has few existing buildings. Baldwin Gulch, draining an area of approximately 3.7 square miles, flows westerly to Cherry Creek, passing between the Ponderosa Hills and Homestead Hills developments. A detention dam and reservoir east of Pine Drive control flood flows downstream to Cherry Creek. Approximately 3.6 miles of Baldwin Gulch were studied by detailed methods. Sulphur Gulch, draining an area of 17.1 square miles, is immedi- ately south of the Baldwin Gulch drainage area. Similarly, it flows westerly for approximately 5.0 miles. passing immediately 7