@article{nwisrl452,
         journal = {Transaction of the ASAE},
          author = {Thomas J. Trout},
           pages = {103--106},
            year = {1986},
          volume = {29},
           title = {Orifice Plates for Furrow Flow Measurement: Part I - Calibration},
          number = {1},
        abstract = {ORIFICES, due to their discharge sensitivity to
head, are potentially the most accurate open
channel flow measurement device and consequently, the
best device for determining furrow infiltration rates by
the inflow-outflow method. Laboratory calibration
determined that orifices under submerged flow
conditions are insensitive to boundaries as close as one-half
diameter from an edge, allowing practical field use
of multi-holed orifice plates in furrows. Submerged flow
discharge coefficient for square-edged orifices with the
plate thickness less than one-third of the diameter is
0.625. Free flow coefficients vary both with orifice size
and head.},
             url = {https://eprints.nwisrl.ars.usda.gov/id/eprint/452/}
}