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2.4 Flood Protection Measures The Templeton Gap Floodway long trapezoidal channel southwesterly direction to has a capacity of 14,000 flood) . (Reference 4) consists of a 10,590-foot- extending from Templeton Gap in a Mile 5 on Monument Creek. The floodway cfs (approximately a 100-year frequency The Peterson Field Drainage is controlled by streamwater detention ponds sited at the Peterson Airfield. These ponds substantially reduce the peak flows from the upper 3.5 square miles of drainageway. . Beginning in late 1939, as an aftermath of the destructive May 1935 flood, the city sponsored flood-control work that eventually provided 2.6 miles of continuous improved channel on Monument Creek and guide levees at the Templeton Gap outlet. The improved channel's original design capacity of 50,000 cfs has been reduced because of changes in the stream's regimen. Local interests have constructed a 0.5-mile long concrete retalnlng wall to stabilize the Fountain Creek south bank as it. extends upstream from the Nevada Avenue bridge. Downstream from this bridge, several small levees provide minimal protection to privately owned properties. The city has purchased the land along Monument Creek to prevent development and has established the Monument Valley Park. Located between Filmore Street and Colorado Avenue, the park occupies a considerable portion of the flood plain in this area. Existing zoning and subdivision ordinances enacted by the city contain provisions which can be the foundation of an effective flood plain management program. Colorado Springs has adopted the necessary flood plain management standards to qualify for the emergency phase of the NFIP. The National Weather Service, in cooperation with Colorado Springs and other communities in El Paso County, has established a Flash Flood Warning System consisting of observers and automatic alarm systems (Reference 5). Portions of several streams in the Colorado Springs area have been channelized in concrete drainageways with sufficient capacity to contain 100-year peak discharges. Streams where this has occurred are Bear Creek, Camp Creek, Douglas Creek (North and South), Sand Creek, Spring Creek, Peterson Field Drainage, Rockrimmon Basin, and South Shooks Run, Templeton Gap Lower Tributary, and portions of Dry Creek. The middle and upper portions of Cottonwood Creek in Colorado Springs have undergone channel improvements consisting of channel widening, riprap channel banks, and levee systems. 11