Evaporation, evapotranspiration, and irrigation water requirements [electronic resource] / prepared by the Task Committee on Revision of Manual 70 ; edited by Marvin E. Jensen, Ph.D., NAE, Richard G. Allen, Ph.D., P.E. ; sponsored by the Committee on Evapotranspiration in Irrigation and Hydrology of the Irrigation and Drainage Council of the Environmental and Water Resources Institute of the American Society of Civil Engineers