FLOOD11471 (2) - Laserfiche WebLink

Home Browse Search

landfills and isolated levees that have been constructed to protect commercial and residential properties fro~ flooding. Large floods are relatively unaffected by these levees. The greatest obstruc- tion is that of houses adjacent to the banks of streams. This usually occurs in the mountainous and hilly basins such as Upper Fountain Creek. 2.4 Flood Protection Measures Two significant water-regulating facilities in the area are Kettle Creek Diversion Dam and Big Johnson Reservoir. The latter is also called Fountain Valley Reservoir Dam No. 2 and is located east of the Security-Widefield community. Big Johnson Reservoir is privately owned by the Fountain Mutual Irrigation Company for the primary purpose of irrigation. The drainage area is approximately 3.1 square miles and the maximum storage is 7,OC.O acre-feet. The dam was modeled as having no effect on the 100- and SOD-year water- surface elevations. Kettle Creek Diversion Dam, owned by the U.S. Air Force, is located or. U.S. Air Force Academy grounds. The earthen dam was constructed for flood control and the reservoir receives water from a drainage area of 16.3 square miles and has a maximum storage of 2,900 acre- feet. The dam was designed to detain flows associated with the Standard Project Flood (SPF) for the Kettle Creek basin and limit the discharge to approximately the 10-year recurrence interval. The Peterson Field Dratnage is controlled by strea~-water dete~tio~ ponds sited at the Peterson Airfield. These ponds substantially reduce the ?eak flows from the upper 3.5 square miles of drainage- way. The Te~pleton Gap Floodway (Reference 8) consists of a 10,590- foot-long trapezoidal channel extending from Te~ple~on Gap in a southwesterly di~ection to Mile 5 on Monument Creek. The floocway has a capacity of 14,000 cfs (approximately a 100-year frequency flood). There are several s~all earthen da~s, stock ponds, canals, and diversion ditches in the study area, but they have no regulatory significance. Generally, the structures divert low =lows for irri- gat:o~ a~d ~ave little or ~o effect on major =lows. Several streams in the Colorado Springs area have been cha~nelized in con~rete drainageways with sufficient capacity to contain lCO- year peak disc~arges. Strea~s affecting the county where t~1~S has occurred are Sand Creek, Spring Creek, Peterson Field Drair~~~! and portions of Dry Creek. 10