Abstract
This paper presents a relationship between the runoff curve number (CN) and mean potential evapotranspiration (PET) using long- term daily rainfall-runoff data. To this end, CNs were derived for different durations from rainfall-runoff data of eight different agro-climatic river basins in India, and these were correlated with PET derived for respective watersheds using the standard Penman-Monteith method. The resulting high coefficient of determination (R 2 ) values, viz, 0.99 for Hemawati and Mohegoan; 0.98 for Haridanagar, Kalu, and Seonath; 0.96 for Manot, Ghodahadho, and Ramganga strongly support the versatility of the derived relationship. This relationship also invokes deter- mination of PET from the available published CN values, and therefore may be quite useful in field applications. DOI: 10.1061/(ASCE)HE .1943-5584.0000780. © 2014 American Society of Civil Engineers. Author keywords: Curve number; National Engineering Handbook hydrology (NEH-4); Penman-Monteith; Potential evapotranspiration (PET); Soil conservation service; Water balance.
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