Abstract
Changes in crop patterns between design and operation of irrigation systems, often lead to conditions where water supply is no longer sufficient to match demand. Managers of irrigation systems are then induced to modify the delivery schedules. In the case of an Italian pressurized irrigation system, the on-demand delivery was modified into restricted frequency demand delivery during peak periods by introducing a 3-day rotation among the sectors within an irrigation district. This change in delivery schedules has been evaluated for the years 1991 and 1992 by comparing the measured daily discharges withdrawn in two districts when operating on demand and on restricted frequency demand. Results show that this practice does not necessarily achieve water savings and, in certain conditions, it can lead to increased demand and over-irrigation.
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