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I I I I I I I I I I I I I I I I I I I I Dacono, Frederick, and Firestone, Existing conditions with respect to this master planning effort was determined to be the land use assuming the existence of those developments approved for construction as of March 1, 1999. For future development conditions, land use and zoning maps were also provided by the local jurisdictions, The land use information is provided on Sheet 3, 4.3.3 Soils, Infiltration, and Depression Storage Soils information for Godding Hollow and Tri-Town Basins was obtained from the Soil . Survey of Weld County, Southern Part, Colorado (1980), published by the Soil Conservation Service, The soil types specified from the soil survey were classified into the four hydrologic soil groups. These four groups basically classify the soils according to infiltration rates, from A representing well drained soils to D representing poorly drained soils. The soil types represented within Godding Hollow and Iri- Town Basins can be generally classified in the B to C hydrologic soil groups. Soils mapping pertinent to the Godding Hollow and Tri-Town Basins is provided on Sheet 4. The Urban Drainage and Flood Control District (UDFCD) analyzed in-depth rainfall/runoff data for each of the hydrologic soil groups and established recommended values for infiltration rates and decay coefficients for use with CUHP (USDCM, Vol. 1, .1978). The values recommended for each of the soil groups are reproduced in Table 4.2, For subbasins containing more than one soil group classification, the coverage of each soil group was measured and an area- weighted average determined, Table 4.2. Hydrologic Soil Groups Recommended Values (USDCM, Vol. 1, 1978). " St5I-iYdrologic ... ." . '.:S9il Groiip . '. ,., 'Finai . . Infilti~ii&n.(iIJhr);.. . .... 'H()iton' s ])e~ay.' ,'.. ,'. Coefficient A B C D 1.0 0.6 0,5 0.5 0,0007 0,0018 0,0018 0,0018 5,0 4,5 3,0 3,0 T:\OPEMCaweldO/\cQweldOi fnl rpt.wpd 4,6 September 8, 1999