Demand Irrigation Schedules

by John L. Merriam, California Polytechnic State Univ, San Luis Obispo, CA, USA,

Abstract: This class of schedules consists of Demand and Limited Rate Demand. They need no communication system and can satisfy the on-farm needs with negligible constraint. The Demand schedule with negligible restrictions on the flexibility of frequency, rate, or duration is seldom economically practical because a large capacity would theoretically be required to meet an improbable demand. The Limited Rate Demand schedule provides a practical answer. The degree of restraint on the maximum rate becomes a balance between the restriction put on the farming operation and the acceptable economics of the probability of allocating it. With only this one restraint, the Limited Rate Demand schedule provides the greatest freedom of operation. Since the maximum rate at the desired probability is controlled by the limit on the system capacity to supply and/or by the limited farm turnout capacity to use, consideration of both must enter into the design considerations.

Subject Headings: Scheduling | Irrigation | Economic factors | Agriculture | Probability | Water demand | Communication systems

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