Orifice Plates for Furrow Flow Measurement: Part I - Calibration

Trout, Thomas J. (1986) Orifice Plates for Furrow Flow Measurement: Part I - Calibration. Transaction of the ASAE. 29(1):103-106.

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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.

Item Type:	Article
NWISRL Publication Number:	0570
Subjects:	Research methodology Mass Import - autoclassified (may be erroneous)
Depositing User:	Dan Stieneke
Date Deposited:	20 Nov 2010 21:52
Last Modified:	13 Jan 2017 20:36
Item ID:	452
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/452