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Flood Frequency Relationships for Small Watersheds in Kansas.
| 题名： | Flood Frequency Relationships for Small Watersheds in Kansas. |
| 作者： | mcenroe, b. m. young, c. b. rome, a. c. |
| 关键词： | flood frequency, rain, precipitation, runoff, stream flow, recurrence, drainage areas, peak flow, regression analysis, gaging stations |
| 摘要： | This report presents some new flood-frequency equations for Kansas that combine the best features of the Rational method and traditional regression equations. These equations provide estimates of discharges with recurrence intervals of 2, 5, 10, 25, 50 and 100 years for unregulated rural streams with drainage areas under 30 mi(sup 2). The inputs to these equations are the drainage area, the mean annual precipitation, and rainfall intensity. The rainfall intensity is the average intensity over the drainage area for a duration equal to the watersheds time of concentration and the same recurrence interval as the desired discharge. Two sets of equations are presented. The equations in the first set are termed Extended Rational equations because the discharge is directly proportional to both rainfall intensity and drainage area, as in the Rational formula. The equations in the second set are power-type equations developed by traditional multiple-regression analysis. The two sets of equations are quite similar, with nearly identical standard errors. Both sets of equations were developed from data for 72 USGS stream-flow gaging stations on unregulated rural streams with drainage areas under 30 mi2 and record lengths of 20 years or longer. Two-year through 100-year discharges for each station were computed from the annual peak-flow data by the most recent USGS method for Kansas. / NOTE: Final rept. / Supplementary Notes: Sponsored by Kansas Dept. of Transportation, Topeka. / Availability Note: Product reproduced from digital image. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0809；69p |
| 报告类型： | 科技报告 |
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