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FLOOD05867
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Last modified
1/29/2010 10:15:23 AM
Creation date
10/5/2006 1:50:45 AM
Metadata
Fields
Template:
Floodplain Documents
County
San Juan
La Plata
Archuleta
Stream Name
San Juan, Animas Rivers
Basin
San Juan/Dolores
Title
Technical Addendum FIS San Juan, La Plata, Archuleta Counties
Date
12/1/1977
Prepared For
CWCB
Prepared By
Camp Dresser & McKee
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 />in appendix A. A copy of the flood flow frequency analysis com- <br /> <br /> <br />puter printout, which includes all data and computations for <br /> <br /> <br />each stream gauging station, is included in Appendix B. The re- <br /> <br /> <br />sults of regression analysis for regional curves of selected re- <br /> <br /> <br />currence intervals are shown in Figures 9 and 10 for the Animas <br /> <br /> <br />and Upper San Juan River Basins, respectively. <br /> <br />'. <br /> <br />Peak discharges used for hydraulic computations in the study areas <br />were generally determined according to: (1) previous studies; (2) <br />regional curves; and (3) weighted discharges between regional curve <br />and station statistics. Peak discharges from previous studies were" <br />used if they are close to the values determined from the regional <br />curves established in this study. Sacramento District Corps of <br />Engineers has completed a flood hazard information report for Ani- <br />mas River, Junction Creek and Dry Gluch Creek in the vicinity of <br />Durango (Reference 3) and a flood hazard information report for <br />Vallecito Creek (Reference 4). Soil Conservation Service has com- <br />pleted a flood hazard study for San Juan River and McCabe Creek in <br />the vicinity of pagosa Springs (Reference 11). Peak discharges <br />in these three reports were used in this flood insurance study. <br /> <br />Peak discharges from regional curves were used in reaches where <br /> <br />no gauging station exists. weighted discharges were used in <br />reaches where gauging station exists. <br /> <br />In the areas of Bayfield and Ignacio where the flow discharges <br /> <br />were affected by the regulation of the Vallecito Reservoir, the <br /> <br />streamflow record at Ignacio after reservoir construction and <br /> <br />reservoir operation record (Reference 2) were analyzed to obtain <br /> <br />-19- <br />
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