Cablegation IV: The Bypass Method and Cutoff Outlets to Improve Water Distribution

Kincaid, Dennis C. and Kemper, W.D. (1984) Cablegation IV: The Bypass Method and Cutoff Outlets to Improve Water Distribution. Transaction of the ASAE. 27(3):762-768.

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Abstract

TWO techniques of improving the water distribution
characteristics of cablegation systems are proposed
and evaluated. The bypass method, which largely
eliminates the problem of end effects, involves starting
the plug at the first outlet and initially bypassing most of
the flow to the downstream end of the pipeline, which is
plugged. As the plug moves down the pipe, the bypass
flow gradually decreases to zero. This method nearly
equalizes the inflow distribution to all furrows and allows
the use of a constant outlet opening size. The bypass can
be accomplished by using a parallel bypass pipe and
weir, or with a flow-through bypass plug. The bypass
plug appears to be the lower cost method and is as
effective as the weir in controlling the bypass.
The second technique deals with the low outlet flows
during the final stages of a "set" which are insufficient to
reach the end of the furrows such that excess water is
applied to the upper ends of the furrows. Two types of
cutoff outlets, a gravity valve and a siphon type outlet
were designed to abruptly cut off the flow at about the
same time that runoff ceases, thus maximizing the
uniformity of infiltration. The cutoff outlets are
recommended for soils having relatively high sustained
intake rates.

Item Type:	Article
NWISRL Publication Number:	0527
Subjects:	Practical farm efficiency Mass Import - autoclassified (may be erroneous)
Depositing User:	Dan Stieneke
Date Deposited:	20 Nov 2010 21:52
Last Modified:	13 Jan 2017 23:17
Item ID:	418
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/418