HYDROLOGY OF IRRIGATION AND THE IMPACT OF IRRIGATION ON THE HYDROLOGIC CYCLE.

Abstract

Modern computer models are powerful techniques for management of water resources in a river basin. To be useful, however, these management models must describe properly the various hydrologic components of the system. Many descriptions of furrow or border irrigation are not adequate to describe truly the physical advance of water in furrows and in the underlying soil. As a result, on-farm efficiency, irrigation efficiency, and other quantities of interest are not described in terms of the parameters susceptible to management. More physically based approaches have been devised to determine these quantities, some of which are reported in this paper.