Return period adjustment for runoff coefficients based on analysis in undeveloped Texas watersheds
Journal of Irrigation and Drainage Engineering
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Abstract
The rational method for peak discharge (Qp) estimation was introduced in the 1880s. The runoff coefficient (C) is a key parameter for the rational method that has an implicit meaning of rate proportionality, and the C has been declared a function of the annual return period by various researchers. Rate-based runoff coefficients as a function of the return period, C(T), were determined for 36 undeveloped watersheds in Texas using peak discharge frequency from previously published regional regression equations and rainfall intensity frequency for return periods T of 2, 5, 10, 25, 50, and 100 years. The C(T) values and return period adjustments C(T)/C(T=10 year) determined in this study are most applicable to undeveloped watersheds. The return period adjustments determined for the Texas watersheds in this study and those extracted from prior studies of non-Texas data exceed values from well-known literature such as design manuals and textbooks. Most importantly, the return period adjustments exceed values currently recognized in Texas Department of Transportation design guidance when T>10 years.
Suggested Citation
Dhakal, N., Fang, X., Asquith, W.H., Cleveland, T., Thompson, D.B., 2013, Return period adjustment for runoff coefficients based on analysis in undeveloped Texas watersheds: Journal of Irrigation and Drainage Engineering, v. 139, no. 6, p. 476-482, https://doi.org/10.1061/(ASCE)IR.1943-4774.0000571.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Return period adjustment for runoff coefficients based on analysis in undeveloped Texas watersheds |
| Series title | Journal of Irrigation and Drainage Engineering |
| DOI | 10.1061/(ASCE)IR.1943-4774.0000571 |
| Volume | 139 |
| Issue | 6 |
| Year Published | 2013 |
| Language | English |
| Publisher | ASCE |
| Contributing office(s) | Texas Water Science Center |
| Description | 7 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Irrigation and Drainage Engineering |
| First page | 476 |
| Last page | 482 |
| Country | United States |
| State | Texas |