FLOOD10854 (2) - Laserfiche WebLink

Home Browse Search

On Sanderson Gulch, an improved grass-lined channel extends from the South Platte River to South Federal Boulevard (State Highway 88). Culverts were improved at South Lipan Street, West Arkansas Avenue, and South Zuni Street. Only minor improvements were completed from South Federal Boulevard (State Highway 88) to South Sheridan Boulevard (State Highway 95) consisting primarily of small drop structures. Improvements were made to the Bit-a-Sea Reservoir located on Sanderson Gulch ,<, immediately upstream of South Sheridan Boulevard (State Highway 95) within the City of Lakewood. The earth embankment was raised and protected to increase storage, and the spillway was improved to increase capacity for discharge of the 1-percent-annual-chance event. Weir Gulch In the upper part of the Weir Gulch drainage basin, there are three irrigation storage reservoirs that affect the floodflows on Weir Gulch: Main Reservoir, Smith Reservoir, and East Reservoir, located upstream of Denver, in the City of Lakewood. There are also two lakes along Weir Gulch, Kountze Lake (also located in Lakewood) and Barnum Lake, both of which store floodwaters and protect areas downstream from flooding. Channel improvements along Weir Gulch have been constructed from West Alameda Avenue to the confluence with the South Platte River (References 26-30). Improvements include the regrading of Barnum Lake and the construction of an additional outlet culvert under West 6th Avenue (U.S. Highway 6), designed to reduce the extent of 1- and 0.2-percent-annual-chance flooding below Barnum Lake. Channel improvements along Weir Gulch have been co-nstructed from just downstream of West Alameda Avenue to Sheridan Boulevard. Improvements included the construction of an approximately 4,200 foot long channel designed to convey the 1-percent-annual-chance flood, five bridges, and three drop structures, designed to convey the flows beneath the four roadways it crosses (Reference 31). Weir Gulch Dakota Avenue Tributary The Weir Gulch Dakota Avenue Tributary project, which extends from the confluence at Weir Gulch upstream to South Sheridan Boulevard, is comprised of a new culvert system which supplements the capacity of an existing adjacent storm sewer system (Reference 32). The culvert system was designed to convey the I-percent-annual-chance flood. Sand Creek Levees are located along Sand Creek in the vicinity of Havana Street; however, these levees have no effect on the 1- and 0.2-percent-annual-chance floods. 13