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There are plenty of options. ..eg. sealing the tunnel in the conveyance part outside the source zone; using trickle irrigation in the fields. If crops need watering more than once a week, the order of watering could be changed... as long as the whole community using the system agrees. Talk to the falaj experts there - Mahmood Al Azri, Head of Falaj sectiion in Ministry of Water Resources; Abdullah Al-Ghafri at Nizwa University. I am copying them in on this. Harriet (Nash)