REGIONAL DRAINWATER MANAGEMENT - SOURCE CONTROL, AGROFORESTRY, AND EVAPORATION PONDS

Source control is one way to address salinity and drainage problems in irrigated agriculture, and reuse of drainage flows on salt-tolerant c rops or trees in agroforestry production is another. A regional model of agricultural production with drainwater reuse and disposal is devel oped. Deep percolation flows are controlled through choice of crop are as, irrigation systems, and applied-water quantities. Crop drainwater may be reused in agroforestry production, and residual emissions are d isposed of in an evaporation pond. A significant role for both source control and reuse is found. Sensitivity to various cost and revenue pa rameters is also analyzed.