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	bibo:abstract "ORIFICES are potentially accurate furrow flow\ndevices. Flow measurement accuracy\ndecreases with head loss. Orifice head loss will increase\nupstream infiltration. Thus, the head loss range must be\nconstrained to maintain measurement accuracy. Design\nequations are developed for 3-hole orifice plates which\ngive a 23:1 flow range with a 5:1 head loss range. A\nportable differential point gauge can measure\nsubmerged flow head loss to the nearest millimeter."^^xsd:string;
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