Use of localized loops for the rehabilitation of on-demand pressurized irrigation distribution systems

AbstractIrrigation distribution systems are generally branched. They can be designed using optimization models that minimize the cost of the pipes under a number of constraints. Urban water distribution systems are generally designed as a series of interconnected closed loops which provide these systems with sufficient capability to overcome local physical failures . However, they enormously increase both the computational effort and the network cost. This research proposes an innovative approach where localized loops are used as a cost-effective solution to improve the performance of branched on-demand pressurized irrigation systems. The position of a localized loop is identified based on the overall performance improvement that can be achieved. This strategy, when necessary, also involves the increase in significantly smaller pipe diameters, where performance improvement cannot occur solely by introducing localized loops. The new approach was applied to an irrigation district in Southern Italy operating on demand. It demonstrated its effectiveness by improving the system’s overall hydraulic performance, while achieving more than 80 % cost savings, as compared to the classical rehabilitation approach. A dedicated software package that may serve, with further improvements, as a DSS platform, was developed and used to perform an accurate hydraulic performance analysis of the irrigation system.

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