| http://www.w3.org/ns/prov#value | - Such problems can be caused by a number of things: ??? Sprinklers can blow out of their hole, creating a geyser on the pivot pipeline. ??? Sprinklers can wear out and stop rotating or rotate out of control. ??? Pumping water level declines so that the system flow rate and pressure no longer match the original design. ??? Boots, gaskets and other seals begin to leak. ??? Sprinkler spacing is too wi
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