OPTIMAL LARGE-SCALE CONJUNCTIVE WATER-USE PLANNING - CASE-STUDY

Optimal sustained ground-water yield and conjunctive water-use strateg ies are presented for northeastern Arkansas, based on water demands pr ojected for the five decades of 1990-2039. Each strategy consists of s patially and temporally distributed values of ground-water and surface -water use. The 33,700 km(2) region has much irrigation and is very de pendent upon ground water. Ground-water flow simulation/optimization ( S/O) models are used to attempt to satisfy temporally increasing water needs for alternative future management scenarios. The S/O models emp loy a sequential steady-state embedding approach, and contain over 1,6 00 embedded ground-water and river-volume balance constraints per deca de (stage).