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Last modified
11/23/2009 12:58:17 PM
Creation date
10/4/2006 9:59:49 PM
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Template:
Floodplain Documents
County
Elbert
Title
Use of Rainfall-Simulator Data in Precipitation-Runoff Modeling Studies
Date
1/1/1983
Prepared For
Elbert County
Prepared By
USGS
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />A summary of the fitted values of hydraulic conductivity is shown in <br />table 8. Repeated values of 1.2 and 1.3 in/h shown for plots 3 and 4 are <br /> <br />Table 8. --SwnmaJl.Y 06 6..i..tted valueo 06 hydIta.u.Ue <br />eonduc.tiv.uy 60ft ob-6eJl.ved iUUn6a.U-lu.mo66 <br />event-6 du.lUng 1982 <br /> <br /> [Results in inches per hour] <br />Date Plots <br /> 1 2 3 4 <br />June 25 0.7 0.7 1.2 1.3 <br />July 26 .6 1.0 1.2 1.3 <br />August 10 .4 .5 1.2 1.3 <br /> <br />somewhat misleading. They could be refined in the second decimal place to show <br />variability, but the differences between observed and computed volumes of run- <br />off are too small to warrant this refinement. Results of fitting KSAT values <br />to reproduce natural runoff events show a consistent hierarchy or rank of run- <br />off potential. Plot 1 ranks first, followed in order by plots 2, 3, and 4. <br /> <br />Comparison of Results of Plot Calibrations <br /> <br />Results of fitting KSAT values to reproduce runoff from rainfall-simulator <br />runs, and results of fitting KSAT values to reproduce runoff from observed <br />rainfall-runoff events are inconsistent, particularly for plots 1 and 2, the <br />high-runoff producers. Summer runs on these two plots give little indication <br />of the runoff potential from natural rainstorms, whereas those for plots 3 and <br />4 are in line with observed runoff potential. Fitting results for fall rainfall- <br />simulator runs on plots 1 and 2 required large reductions in the magnitude of <br />KSAT; these results were in line with fitted results based on observed rainfall- <br />runoff events. With the exception of the October 29 1982, simulator run on <br />plot 3 (a very extreme antecedent condition), large reductions in KSAT were <br />not required to fit the fall runs on plots 3 and 4. Results of fitting hydraulic <br />conductivity to reproduce both rainfall-simulator data and observed rainfall- <br />runoff events are llummarized in table 9. <br /> <br />WATERSHED MODELING--NORTH FORK WILLOW GULCH <br /> <br />Partitioning the Watershed <br /> <br />The distributed-parameter modeling capability of PRMS (precipitation- <br />runoff modeling system) allows a watershed to be partitioned into homogeneous <br /> <br />40 <br />
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