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Peak Rates of Runoff from Small Watersheds.
| 题名： | Peak Rates of Runoff from Small Watersheds. |
| 关键词： | watershed；small；peak；rate；from；variations；characteristics；graphic；relation；measurement |
| 摘要： | An obviously basic problem in the design of bridges and culverts is that of estimating the volume of streamflow to be expected at peak periods. It has long been realized, among hydrologists, that differences in watershed area alone are insufficient to explain the wide variations in peak rates of runoff found to exist among watersheds. This is true even when these variations are limited to those within the boundaries of an area where the principal physiographic characteristics of watersheds are similar. The research investigation reported here successfully determined the identity of these additional variables, and from it there has been developed a procedure for predicting runoff peaks from small watersheds in most of the United States east of the 105th meridian roughly, east of Denver, Colo. The evidence presented in this report might seem to provide a logical basis for the extrapolation of the relations and procedures developed to unsampled physiographic areas. It is realized, however, that only time and the measurements from hundreds of additional small watersheds could prove whether or not such extrapolation was justifiable. Unfortunately, the highway engineer cannot wait for such proof but must continue to design drainage structures for highway system improvements needed for our ever-expanding traffic. Although the objective of this investigation was to furnish assistance to the highway engineer, he should keep in mind that estimates obtained for watersheds in unsampled physiographic areas through the use of these relations and procedures should be considered as aids to engineering judgment rather than as proven figures. |
| 报告类型： | 科技报告 |
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