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I I I I I I I I I I I I I I I I I I I 2.0 2.1 2.2 QTUDY AREA DESCRIPTION Location This rePort addresses the drainage basins of Rangeview Gulch, Jackass Gulch, LDwer Dad Clark Gulch (downstream of McLellan Reservoir), and the direct flow areas to the South Platte River located between the gulches. 1. Santa Fe Drive, the Denver & Rio Grande Western Railroad (D&RGW), and the Atchison, Topeka and Santa Fe Railroad (AT&SF): These features are located adjacent to each other and run north and south through the study area. These features greatly influence the natural westerly drainage patterns. E~~~water FAl( IN The study area is located almost entirely within the limits of the City of Littleton. It lies just north of County Line Road and is bounded on the west by the South Platte River and on the east by South Broadway. The drainage basins include approximately 2.6 square miles. The project location is shown on the vicinity map in Figure 2-1. AL.....lO.. " 26 c_, ~ ~ ~SI~PI " C . ~ c . . . . r--.... , c" , '-> C~ Drainaae Basin Characteristics Some important physical features of the overall study area are discussed below and are labeled on the Location Sheets (Sheets 2 and 3): 2. City Ditch: The ditch (owned by Englewood) flows to the north and is located in the lower portion of the basin, mostly on the west side of Santa Fe Drive. In the future, the ditch is planned to be enclosed in a 60-inch pipe. " . " " " . u A'UPA"OE ltD 3. Highline Canal: This feature is owned and operated by the Denver Water Department and crosses the upper basins of Rangeview and Jackass Gulches. Drainage from the Rangeview basin upstream of the Highline Canal would normally flow across the canal into Rangeview Gulch. However, development in the area directs the 1 DO-year flow through a storm sewer system to the Jackass Gulch basin. Flows from the Upper Jackass basin cross the canal in a storm sewer system. Storm runoff from the South Park commercial area just south of the Upper Jackass basin is discharged into the Highline Canal through several onsite detention facilities. During the 100-year event, the total discharge from these facilities is approximately 550 cfs. ARAPAHOE DOUGLAS COUNTY PRo.a.CT LOCATIOII Routine Highline Canal releases during rainfall events have caused local flooding in the Lee Gulch drainageway. From the Highline Canal Master Plan study done in 1975, the capacity of the canal between Lee Gulch FIGURE 2-1 LOWER DAD CLARK GULCH & DFA 0068 VICINITY MAP I