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Last modified
1/25/2010 6:44:42 PM
Creation date
10/5/2006 12:11:38 AM
Metadata
Fields
Template:
Floodplain Documents
County
Larimer
Community
Denver International Airport
Stream Name
Boxelder Creek
Basin
South Platte
Title
Hydrology Studies on New Airport in the Boxelder Creek Watershed
Date
11/1/1988
Prepared For
Denver Airport Planning Office
Prepared By
Kiowa Engineering Corporation
Floodplain - Doc Type
Floodplain Report/Masterplan
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<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 />4 <br /> <br />The drainage area within the Airport boundary itself is about eight square <br />miles. The basin within the airport boundary is seven miles long, two miles <br />wide (at it's widest) and the average stream slope is 24 feet per mile. <br />Existing development is mostly agricultural land and future development inclu- <br />des only small portions of runways and taxi-ways to be located near the north <br />side of the Airport. The future land use for a small part of the basin adja- <br />cent to the outside of the east and south Airport boundary is assumed to be <br />commercial and business use for the hydrologic modelling purpose. <br /> <br />Unnamed Basins <br />Some of the individual drainage basins within the study area either have <br />no direct connection to the Box Elder Basin or Hayesmount Basin. These basins <br />are defined as direct flow areas and their locations are shown on Figures 4 <br />and 5. Existing land use for these areas are agriculture. Future development <br />includes airport-related facilities, such as offices, runway, and taxiway. <br /> <br />Soils Descriptions <br />Soils information was obtained from the Soil Conservation Service, Soil <br />Survey for Adams County. The significance of soil type for hydrologic analy- <br />sis is in the infiltration rate. Soils are classified into four hydrologic <br />classifications; namely, A, B, C, and D. Initial infiltration rates range <br />from 5.0 inches per hour for Type A soils to 3.0 inches per hour for Type C <br />and D soils. <br />Soils in the study area <br />found in both the lower and <br />map is given in Figure 2. <br /> <br />B. <br /> <br />are mainly Types Band C. Some Type A soils are <br />upper portions of the basins. A hydrologic soil <br /> <br />C. Previous Studies <br />The only previous report of significance is the Flood Insurance Study <br />(FrS) for the Box Elder Creek. This report contains floodplain information <br />for the unincorporated areas in Adams County. According to the report, the <br />peak discharges for the 10-, 50-, 100-, and 500-year storms at Interstate 70 <br />(1-70) are 10,000 cfs, 12,100 cfs, 13,900 cfs, and 18,000 cfs, respectively. <br />Since the total drainage basin at 1-70 is 200 square miles, which is almost 25 <br />times the size of Box Elder Basin within the New Airport site, the impact of <br />
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