Improved water management affords an alternative to the measures commonly used to offset the effects of a declining water supply. In many situations, where the continued decline in water levels has offset the increase in water supply from new wells, lowered pumps and installation of undergrowund delivery systems, a changed water management program may be the only means of avoiding a return to dryland farming. Because of competition for water during the first 2 weeds of August, the independently developed cotton and grain sorghum irrigation practices that maximize yields cannot be advantageously combined on the same form. Therefore, the management program must be modified to minimize the effects of competing demands for water. Four alternative water management systems may be followed if the operator prepares for them in advance. These alternatives, designated in this report as water management systems 1, 2, 3 and 4, differ only after August 1. With system 1, which uses the smallest amount of water, only cotton is irrigated after August 1. With system 2. which uses a little more water than system 1, a full-season hybrid sorghum is the only crop irrigated after August 1. System 3 combines the cotton irrigation program of system 1 with irrigation of sorghum hybrids planted about July 1. In system 4, the first water application on the full-season sorghum hybrids is made as in system 2, after which the water is shifted to the late-planted sorghum hybrids. Since systems 3 and 4 are heavy water users, they should not be used regularly. (...).