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| Estimating Georgia flood-frequency discharges using multiple-region calculator |
Methods for estimating flood discharges for specific recurrence intervals for sites on large streams that drain more than one flood-frequency region differ from methods used for sites on smaller streams that fall within one region. The Ocmulgee, Altamaha, Flint, Ogeechee, and Withlacoochee Rivers are the only streams that drain more than one region.
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Multiple-Region Flood-frequency calculator For each region,select the region number and the drainage area of the portion of the basin in that region, and click "Submit"
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| Flood discharge,Qn, for n-year recurrence interval |
Flood-frequency relations for indicated regions in the form Qn = aAb, where A is the drainage area, in square miles, and a and b are as presented below | |||
| Region 1 | Region 2 | Region 3 | Region 4 | |
|---|---|---|---|---|
| Q2 | 207A.654 | 182A.622 | 76A.620 | 142A.591 |
| Q5 | 357A.632 | 311A.616 | 133A.620 | 288A.589 |
| Q10 | 482A.619 | 411A.613 | 176A.621 | 410A.591 |
| Q25 | 666A.605 | 552A.610 | 237A.623 | 591A.595 |
| Q50 | 827A.595 | 669A.607 | 287A.625 | 748A.599 |
| Q100 | 1,010A.584 | 794A.605 | 340A.627 | 926A.602 |
| Q200 | 1,220A.575 | 931A.603 | 396A.629 | 1,120A.606 |
| Q500 | 1,530A.563 | 1,130A.601 | 474A.632 | 1,420A.611 |
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Home | USGS Water Resources of Georgia Select site by: Site number | Site name | County | Area | Region Ungaged site information | Ungaged calculator | Two-region calculator | Limitations This URL: http://nts4dgaatl.er.usgs.gov:80/floodfrequency/calcmultiregion.cfm Last updated: 11/28/2001 10:12:17 AM Note: Information and data on this Web site come from "Techniques for Estimating Magnitude and Frequency of Floods in Rural Basins of Georgia," USGS Water-Resources Investigations Report 93-4016, by Stamey, T.C., and Hess, G.W., 1993 USGS Privacy Statement || Disclaimer |