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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 />previous fall (0.5 inth for 1981; 0.65 inth for 1982). The fitted value <br />of KSAT for plot 3 had to be reduced from the 1981 value of 1.0 inth to <br />match observed runoff. <br /> <br />The range (where available) in fitted values of hydraulic conductivity <br />for summer and fall runs is shown in table 6. Data from summer runs show <br />little in the way of significant differences in the runoff potential between <br />plots 1-4. Data from fall runs indicate some resemblance to an ordering or <br />ranking of runoff potential, in the same ordering as the plot-sequence number. <br /> <br />Table 6.--Ra.nge in 6.u:ted va..f.ue6 06 hydlr.a.uli.c. <br />c.ondu.c.t.i.vUy 60lt -6u.mmeJt and 6a.U. ltun-6 <br />[Results in inches per hour. Values <br />in parentheses indicate ranges <br />not available.] <br /> <br />Plots <br /> <br />Runs <br /> <br />I:' <br /> <br />1 <br /> <br />2 <br /> <br />3 <br /> <br />4 <br /> <br />5 <br /> <br />", <br /> <br />Summer <br />Fall <br /> <br />1.1-1. 5 <br />0.5-0.65 <br /> <br />1. 0-1. 2 <br />(0.75) <br /> <br />1. 0-1. 3 <br />0.65-1.0 <br /> <br />1. 0-1. 5 <br />(1. 30) <br /> <br />1. 5-1. 6 <br />(1.4) <br /> <br />Calibration Using Observed Rainfall-Runoff Data <br /> <br />i, <br />:1 <br /> <br />Three rainfall-runoff events are available for analysis: June 25, <br />July 26, and August 10, 1982. Stage-recorder malfunction and plot failures <br />hamper the usefulness of these data; but, overall, these available data give <br />valuable insight into natural runoff characteristics. The largest runoff- <br />producing event occurred the evening of June 25, when rainfall intensities <br />in the range of 5 and 6 inth were recorded by tipping-bucket rain gages, <br />located near plot 2 in the upland ponderosa area, and near plot 4 in the <br />lowland prairie area. During this event, plots 1, 3, 4, and 5 overflowed <br />their downslope diversion dikes. Perimeter edging around the plots also <br />failed to divert surface runoff from upslope; only plot 2 withstood the <br />excessive runoff during this event. Unfortunately, the pressure transducer <br />malfunctioned, and observed stage data are poor. No record of stage is <br />available for this event, or the event of July 26 for plot 5; both the <br />digital punch and pressure transducer were inoperative. A summary of <br />available data is shown in table 7. <br /> <br />I; i <br /> <br />Ii. i <br />II':: <br />il!: <br />I~ i <br /> <br />Iii, <br /> <br />> <br /> <br />. <br />, <br />I <br />I <br />I <br /> <br />33 <br />
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