Laserfiche WebLink
<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />BAS I N <br /> <br />DES C RIP T ION <br /> <br />The Little Dry Creek drainage basin lies in and extends partially beyond <br /> <br /> <br />the southern Denver metropolitan area as shown on the following location <br /> <br /> <br />map, Chart 1. Little Dry Creek flows into the South Platte River at Engle- <br /> <br /> <br />wood, Colorado and its drainage area is 25.2 square miles. The drainage <br /> <br /> <br />basin is roughly twelve miles long and two and one-half miles wide. <br /> <br />Ground elevations in the basin range from about 6,300 feet above sea level <br /> <br /> <br />at the highest divide in Douglas County to 5,260 feet at the confluence of <br /> <br /> <br />Little Dry Creek with the South Platte River. The basin elevation dif- <br /> <br /> <br />ference of 1,040 feet gives moderate to steep sub-basin slopes of 5 to 43 <br /> <br /> <br />feet per thousand feet in different parts of the basin. The long narrow <br /> <br /> <br />shape of the drainage basin tends to reduce the peak flows at the lower end <br /> <br /> <br />of the basin compared to those that would occur in a wider basin. <br /> <br />The altitude difference in the basin affects the rainfall amounts that may <br /> <br /> <br />be expected in the different parts of the basin. More rainfall is expected <br /> <br /> <br />at the higher elevations than at the lower elevations. The 4.0-inch, 100- <br /> <br /> <br />year, 3-hour storm to be expected at the higher elevations is reduced to a <br /> <br /> <br />3,3-inch storm at the lower elevations. <br /> <br />Major Waterways <br /> <br />The major waterways in the Little Dry Creek drainage basin were studied as <br /> <br /> <br />required by the contract, but not the small tributaries. A number of major <br /> <br /> <br />waterways that were studied are not named on standard reference maps. These <br /> <br /> <br />waterways were named for reference purposes from local landmarks or roads. <br /> <br /> <br />Blackmer Gulch was named after Blackmer Dam, Quincy Gulch after Quincy Ave- <br /> <br /> <br />nue, and Prentice Gulch after Prentice Avenue. The proposed additional <br /> <br /> <br />detention dams are similarly identified. The major waterways studied and <br /> <br /> <br />their sub-basins, together with hydrologic points used are shown on the <br /> <br /> <br />general map, Chart 2, <br /> <br />-8- <br />