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Sloans Lake Basin was studied by the study contractor using approximate methods. An approximate analysis of Marston Lake North Drainage Basin "'85 included in this study by Dames & Moore at the request of FEMA. Marston Lake North has been revised to reflect channel improvements, the addition of culverts and a sedimentation basin. Approximate analyses were used to development potential or minimal methods of study were proposed to, City and County of Denver. study those areas having a flood hazards. The scope and agreed upon by, .EMA and 10," and the 2.2 Community Description The coextensive City and County of Denver is situated on gently rolling land 40 miles east of the Continental Divide in north- central Colorado. The al titude is 5,260 feet on the steps of the State Capitol Building and is the reason Eor the titLe "Mile High City." Panoramic views of the towering ranges of the Rocky Mountains Can be enjoyed from innumerable vantage points in Denver, and the vista sweeps from Pikes Peak, 75 miles southward, to Longs Peak, 65 miles northwest of the city. The population in the city is 490,000 according to the 19a0 census; however, planners project a population of 614,000 by the year 2000. Denver derived its name from James W. Denver, the Territorial Governor of Kansas at the time of the cityl s origin. In November 1858, a party of land claim "jWllpers" appropriated the town site of St. Charles, located on the east bank of Cherry Creek, and established a new settlement named by them "Denver City." In April 1861, Denver City and its rival town, Auraria, consolidated under the name "Denver." When Congress authorized Colorado' s entry into the Union on August I, 1876, Denver was made the State Capital (Reference 1). Denver is bordered by the incorporated Cities of Lakewood, Aurora, Wheatridge, Sheridan, Englewood, Cherry Hills Village, Littleton, Edgewater, Commerce City, Glendale, and Greenwood Village, and the incorporated Towns of Bow Mar, Lakeside, and Mountain View. Denver is also bordered by unincorporated areas of Adams, Jefferson, and Arapahoe Counties. Denver has elevations ranging from nearly 5,200 feet to approximately 5,500 feet. With its location in the mid-latitudes in the interior of the North American continent, Denver experiences large temperature changes from summer to winter and rapid changes in weather due to storms traveling from west to east through the region. The mountains to the west effectively block atmospheric lllOisture originating in the Pacific Ocean and leave the area dependent on moisture from the Gulf of Mexico, which is not consistently brought to the region. Consequently, the region is dry with low amounts of precipitation that are quite variable through the year. Small amounts of water in the air are 7