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I I I I I I I I I I I I I I I I I I I 3 II. STUDY AREA DESCRIPTION A. Basin Descriptions The study area consists of the drainage basins of Hayesmount Gulch and Tributary, and a portion of the Box Elder Drainage Basin (see Figure 1). The study area is within the proposed New Denver Airport (Airport) boundary which is bounded by 112th Avenue to the north, Watkins Road to the east, 56th Avenue to the south, and Powhaton Road to the west. Ironda1e Road traverses through the central portion of the study area in an east-westerly direction. Existing development within the study area is mainly agricultural with dry1and farming and pasture. Future development includes airport-related facilities within the Airport boundary and annexed land use adjacent to the outside of the Air- port boundary. A description of each drainage basin follows. Hayesmount Gulch and Tributary Hayesmount Gulch drains approximately nine square miles of area at the north Airport boundary and eventually enters the Hudson Canal which is located approximately seven miles north of the New Airport boundary. The basin is about seven miles long and 1.7 miles wide (at it's widest). The drainage basin ranges in elevation from 5,640 feet at the top of the basin to 5,250 feet at the Airport boundary. The average stream slope is 55 feet per mile. Existing development within the basin consists of agricultural lands. Hayesmount Gulch Tributary drains approximately three square miles of area to the Hayesmount Gulch. The basin is about two miles long and 1.5 miles wide (at it's widest). The drainage basin ranges in elevation from 5,420 feet at the top of the basin to 5,280 feet at the Airport boundary. The average slope is 70 feet per mile. Existing land use is mainly agricultural. Future deve 1 opment for both Hayesmount Bas i n and the Tri buta ry i nc 1 udes a i rport- related facilities such as the terminal building, airline office and cargo, roadway, and tax i-way. A sma 11 port i on of the Hayesmount Bas i n outs i de the south Airport boundary is zoned as business and commercial use according to the City of Aurora's land use map. Box El der Creek Box Elder Creek originates from E1 Paso County. is approximately 220 square miles at the south side The total drainage basin of the Airport boundary.