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PERMFILE40498
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PERMFILE40498
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Entry Properties
Last modified
8/24/2016 10:43:25 PM
Creation date
11/20/2007 10:21:47 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981071
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
Exhibit 13 4th Part
Media Type
D
Archive
No
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•. <br /> <br />reaches 6936.1 feet The change in storage volume between this elevation and the elevation of the first row <br />of perforations in the riser pipe is 160.2 - 131.E = 28.4 AF. Table 2 shows the adjustments to the computed <br />stage-discharge relationship. <br />Results of the hydrologic routings of the 10-year and 100-year 24-hour duration runoff hydrographs <br />are included in the Appendix. The 100-year peak outflow equals 717 cfs with a corresponding peak water <br />surface elevation in the pond of 6940.6 feet. For the 10-year event, the maximum discharge is 12'cfs with <br />a computed water surface elevation of 6938.1 feet. <br />Pond D <br />The drainage area for Pond D appears to have changed significantly since the original pond <br />certifications and designs were developed. The drainage area delineated on the enclosed map equals 916 <br />acres. The runoff volume and peak runoff corresponding to this acreage were obtained from the charts <br />contained in Peak Flows in Colorado. For an average curve number of 79, the runoff volume and peak <br />discharges are as follows: <br />Event 8 Duration Runoff Volume (AF) Peak Inflow (cfs) <br />10-year, 24•hour 30 163 / <br />100-year, 24-hour 74 448 / <br />Rating curves for the riser pipe and spillway were developed using the same procedure as described <br />for Pond A. Tables 3 and 4 show the results of these computations. <br />Hydrologic routing of the inflow hydrographs indicates a 100-year peak outflow from Pond D of 285 <br />cfs with a maximum water surface elevation in the pond of 6851.9 feet, Similarly, the 10-year outflow is 11 <br />cfs, with a maximum stage of 6850.3 feet. <br />Portd G <br />Hydrologic analysis of the Pond G watershed yielded the following runoff volume and peak <br />n <br />discharge data corresponding to an average curve number of 79: <br />5 <br />Water Engineering 8 Technology, Inc. <br /> <br />
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