Date: 03 Aug 2012

Evaporation and Evapotranspiration Estimation Methods

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Abstract

Estimation in spite of measurement is the common approach to acquire ET data for most applications. Selection of a method for a specific application requires evaluation of methods with respect to the accuracy needed, available input data, and cost of data generation. Methods vary by complexity and input data requirement. In cases where simple methods provide reasonable estimates, adaptation of such methods could be a cost-effective way of acquiring ET data. In this chapter, several open water evaporation and ET estimation methods are provided with application to a region. Methods are organized from the simplest to the most complex with evaluation of input data requirements. Measured, derived, and estimated input parameters for the application of the Penman–Monteith method are presented in detail with experimental measurements of resistance terms.