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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 />CHAPTER III <br />HYDROLOGIC ANALYSIS <br /> <br />A. General <br />A detailed hydrologic analysis was performed for the Phase A <br />portion of the study to define the existing conditions floodplain and <br />the future development floodplain with existing drainage facilities, <br />These results were used to define alternative solutions for the drainage <br />problems. The Phase B hydrologic analysis consists of defining the <br />magnitude and volume of the storm runoff that will be used for pre- <br />liminary design of the facilities under the selected plan. <br />B. Hydrology <br />The Phase A hydrology was reviewed and found to be of sufficient <br />detail to define the design flows for Phase B. A complete discussion <br />of the hydrology is presented in the Phase A report and only the <br />results will be presented herein. <br />Table 111-1 lists the basin characteristics for the existing <br />development and future development conditions that were used in the <br />determination of the sub-basin hydrographs. The design rainfall <br />increments for the 2, 10 and 100 year storms is presented in Table <br />111-2, with a sample hydrograph output in Table 111-3. <br />During the period from the completion of the Phase A analysis to <br />the present, a new set of criteria for determining the unit hydro- <br />graph parameters was developed and adopted by U.D. & F.C.D. These <br />data are the results of an investigation of the gaged basins in <br />the Denver Metro area and other areas by E.F. Schultz of Colorado <br />