Situation The Naches-Selah Irrigation District’s steep terrain and ageing manually operated canal system made it challenging to operate. The district has steep canals (with slopes of up to 1:500) and a variety of conduits are incorporated into the main canal, including elevated flumes, tunnels and siphons. In addition, with no formal water ordering system and a number of large water users, demand is always unpredictable. It was difficult for c

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