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	bibo:abstract "ORIFICES, due to their discharge sensitivity to\nhead, are potentially the most accurate open\nchannel flow measurement device and consequently, the\nbest device for determining furrow infiltration rates by\nthe inflow-outflow method. Laboratory calibration\ndetermined that orifices under submerged flow\nconditions are insensitive to boundaries as close as one-half\ndiameter from an edge, allowing practical field use\nof multi-holed orifice plates in furrows. Submerged flow\ndischarge coefficient for square-edged orifices with the\nplate thickness less than one-third of the diameter is\n0.625. Free flow coefficients vary both with orifice size\nand head."^^xsd:string;
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