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I I I I I I I I I I I I I I I I I I I was prepared by Delta Aerial Surveys, Inc., of Denver, Colorado, as a subconsultant to Gingery Associates, Inc. Ground control for the mapping project was collected and compiled by Gingery Associates under their Flood Insurance Study contract. Harvard Gulch and its tributary, Dry Gulch, are located within the City and County of Denver. West Harvard Gulch, east of the Colorado and Southern Railroad crossing and west of South Zuni Road, is also located in the City and County of Denver. Between South Zuni Road and the C&S Railroad, West Harvard Gulch is in the City of Englewood (Arapahoe County) . The mapping was prepared according to the "Specifications and Guidelines for Photograrnmetric Services" of the Urban Drainage and Flood Control District. The mapping was checked by Geodetic Surveys under separate contract with the District, and was subsequently approved by the District. The Harvard Gulch and West Harvard Gulch basins have essentially reached a full development condition with the exception of a few scattered, vacant lots. The Harvard Gulch basin is primarily urbanized by single family residences. Commercial development is generally located along Colorado Boulevard, Broadway Boulevard and Santa Fe Drive. A small amount of light industrial develop- ment is also located along the east side of Santa Fe Drive. The campus of the University of Denver is located in the northern part of the basin. The final map sheets were reduced in half for printing in this report. The mapping presented in this report is therefore at a scale of 1"=200'. - BASIN DESCRIPTIONS - Harvard Gulch flows west through the southern part of the City of Denver to its confluence with the South Platte River. The basin elevations range from 5,630 feet at the headwaters to 5,250 feet at the mouth. The total area of the drainage basin is approximately 7.7 square miles (4,700 acres). The average basin width is about 2.0 miles. Channel slope in the study area ranges from about 0.6 percent to 1.3 percent. The residential development in the ,basin is very dense. Lots are very small, and impervious areas on these lots average 40 percent. Early development showed very little concern for drainage, and the old channel has been completely obliterated by urbanization from Logan Street to the South Platte River. The West Harvard Gulch basin is also primarily in residential development. Commercial areas are situated along Federal Boule- vard, and a light industrial park is located in the basin's lower reaches. Loretto Heights College sits on the ridge that forms the southern boundary of the basin. Dry Gulch flows into Harvard Gulch from the south at Logan Park in the City of Denver. Basin elevations range from 5,585 feet at the headwaters to 5,305 feet at the mouth. The total area of the drain- age basin is 1.8 square miles (1,150 acres). The average basin width is 2/3 mile, and the channel slope in the study area is approximately 1. 2 percent. Several drainage improvement projects have been constructed in the Harvard and West Harvard Gulch basins over the last 15 years. The most extensive improvements were made on Harvard Gulch as part of the "Harvard Gulch Flood Control Project" which was the result of a $2.3 million bond issue passed by the City of Denver in 1964. This project included an underground box culvert from Logan Street to the South Platte River where the channel had been obliterated by development. A grass lined open channel was designed through Logan Park which also serves as an inlet to a detention pond in the park. -2- West Harvard Gulch flows east through Denver to its confluence with the South Platte River. The basin elevations range from 5,525 feet to 5,250 feet. The total area of the drainage basin is approxi- mately 1.4 square miles (900 acres). The average width of the basin is 2/3 mile, and the channel slopes range from 1.3 to 2.4 percen t .