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<br />Hydrologic Analyses
<br />
<br />Hydrologic analyses were carried out to establish the peak discharge. frequency
<br />relationships for each flooding source studied in detail affecting the geographic
<br />area of the Town of Marble, Colorado,
<br />
<br />Discharges along the Crystal River were calculated using the PEAKFQ computer
<br />program (Reference I) which uses a 10g.Pearson Type III frequency analysis,
<br />The analysis is based on USGS gage information, totaling over 45 years of
<br />record, along the Crystal River, just downstream of the Town of Marble, Peak
<br />discharges from the USGS gaging stations were adjusted along the study reach
<br />based on the guidelines provided in the Manual for Estimating Characteristics of
<br />Natural.flow Streams in Colorado. Technical Manual No, 1 (Reference 2),
<br />
<br />Peak discharge.drainage area relationships for the streams studied by detailed
<br />methods are shown in Table I,
<br />
<br />Table 1. Summary of Discharges
<br />
<br />Flooding Source and Location
<br />
<br />Drainage Area Peak Discharge (cfs)
<br />(Square Miles) IO-Year 50.Year 100.Year 500.Year
<br />
<br />Crystal River
<br />Confluence with Rapid Creek
<br />Confluence with Milton Creek
<br />Town of Marble
<br />Upstream Limit of Study
<br />
<br />93,05
<br />83,65
<br />73,59
<br />53.32
<br />
<br />1994
<br />1833
<br />1657
<br />1284
<br />
<br />2445
<br />2248
<br />2031
<br />1575
<br />
<br />2625
<br />2413
<br />2181
<br />1691
<br />
<br />3028
<br />2783
<br />2515
<br />1950
<br />
<br />9.0
<br />
<br />BffiLIOGRAPHY AND REFERENCES
<br />
<br />1. U,S, Geological Survey, Computer Program PEAKfQ Version 4,0, Annual flood
<br />freQuencv Analvsis Using Bulletin I 7B Guidelines, December 2000,
<br />
<br />2, Colorado Water Conservation Board, Colorado Department of Natural Resources,
<br />Manual for Estimating Flood Characteristics of Natural. Flow Streams in Colorado.
<br />Technical Manual No, 1, 1976
<br />
<br />IrB/OS,
<br />
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