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Monument Creek originates northwest of Colorado Springs and travels 35.7 miles to join Fountain Creek in southwestern Colorado Springs. From its source, the perennial stream flows easterly for approximately 8 miles, descending ,from a 9,350-foot elevation through precipitous canyons and transitional foothills to emerge near Palmer Lake at the 7,100-foot elevation. It then turns south and parallels the mountains for the remaining distance to its confluence with Fountain Creek. Monument Creek is generally entrenched, with an average slope of approximately 30 feet per mile. It has been channelized between Woodman Road and approximately 7,000 feet downstream of Woodman Road. West of the main stem of the creek, the rough and broken mountain terr~in vegetation ranges from mixed coniferous trees to hardy shrubs and typical mountain grasses. East of the main stem, the high plateau descends gradually to generally rolling land covered by grass with some shrubs and brushes. Both coniferous and deciduous trees grow along the creek banks. The Peterson Field Drainage is a left bank tributary of Sand Creek, entering approximately 0.25 mile from Sand Creek's confluence with Fountain Creek. The upper one-third of the basin is characterized by shallow swales that convey overland flow across Peterson Airfield. Detention ponds under development within the airfield boundaries substantially limit peak flows from this area and -have been considered in this study. The lower portions of the drainage are characterized by light industrial and residential development; the channel is concrete lined from Monica Drive to its confluence with Sand Creek. Pine Creek, a narrow, deep stream, which JOlns Monument Creek in northern Colorado Springs, is 7 miles long, and has a drainage area of approximately 10 square miles. The upper reach of Pine Creek is an area of recent annexation and potential development. The lower reach borders U. S. Air Force Aca\lemy. Heavy commercial development has taken place in the lower portions of the Pine Creek basin. North Pine Creek is a right-bank tributary of Pine Creek entering in the upper eastern reaches of Pine Creek. The Rockrimmon Basin lies in northwestern Colorado Springs. The basin is oriented in a southeasterly direction to the outfall points along Monument Creek near the Woodman Road Interchange on Interstate Highway 25. The basin is draine~ by one major defined channel with many minor contributing branches and,' except after a storm, all channels are dry. Lower portions of the drainageway flow are confined in a concrete channel. Sand Creek originates northeast of the city and flows southwesterly through eastern Colorado Springs and joins Fountain Creek approximately 0.5 mile south of t,he southern corporate limits. Sand Creek is typical of many ephe~era1 streams in that there is a tendency for the channel to meander over a period of years. Historical evidence of meandering is predominant in the lower reaches where there is relatively less topographic relief and the channel broadens into and becomes part of the flood plain. Two tributaties 6