Estimation of volumetric runoff coefficients for texas watersheds using land-use and rainfall-runoff data

Nirajan Dhakal, Xing Fang, Theodore Cleveland, David Thompson, William Asquith, Luke J. Marzen

Research output: Contribution to journalArticle

Abstract

The rational method for peak discharge (Q p ) estimation was introduced in the 1880s. Although the rational method is considered simplistic, it remains an effective method for estimating peak discharge for small watersheds. The runoff coefficient (C) is a key parameter for the rational method and can be estimated in various ways. Literature-based C values (C lit ) are listed for different land-use/land cover (two words, no hyphen) (LULC) conditions in various design manuals and textbooks; however, these C lit values were developed with little basis on observed rainfall and runoff data. In this paper, C lit values were derived for 90 watersheds in Texas by using LULC data for 1992 and 2001; the C lit values derived from the two data sets were essentially the same. Also for this study, volumetric runoff coefficients (C ν ) were estimated by using observed rainfall and runoff depths from more than 1,600 events observed in the watersheds. Watershed-median and watershedaverage C
Original languageEnglish
Pages (from-to)43-54
JournalJournal of Irrigation and Drainage Engineering
StatePublished - Apr 30 2011

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