Journal
JOURNAL OF IRRIGATION AND DRAINAGE ENGINEERING
Volume 139, Issue 6, Pages 476-482Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)IR.1943-4774.0000571
Keywords
Peak discharge; Rational method; Return period; Runoff coefficient
Funding
- TxDOT [0-6070, 0-4696, 0-4193, 0-4194]
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The rational method for peak discharge (Q(p)) 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. (C) 2013 American Society of Civil Engineers.
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