TY - JOUR
T1 - Return period adjustment for runoff coefficients based on analysis in undeveloped Texas watersheds
AU - Dhakal, Nirajan
AU - Fang, Xing
AU - Asquith, William
AU - Cleveland, Theodore
AU - Thompson, David
PY - 2013/7/5
Y1 - 2013/7/5
N2 - 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, CT, were determined for36 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 CT values and return period adjustments CT=CT 1/4 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 adjustment
AB - 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, CT, were determined for36 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 CT values and return period adjustments CT=CT 1/4 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 adjustment
KW - Peak discharge
KW - Rational method
KW - Return period
KW - Runoff coefficient
UR - http://www.scopus.com/inward/record.url?scp=84879597283&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)IR.1943-4774.0000571
DO - 10.1061/(ASCE)IR.1943-4774.0000571
M3 - Article
VL - 139
SP - 476
EP - 482
JO - Journal of Irrigation and Drainage Engineering
JF - Journal of Irrigation and Drainage Engineering
IS - 6
ER -