NON-LINEAR ANALYSIS OF SEEPAGE INTO DRAINS
NON-LINEAR ANALYSIS OF SEEPAGE INTO DRAINS
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Date
1986-12
Authors
RAFINDADI, NURUDDEEN ABDULRAHMAN
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Abstract
The sustenance of viable agriculture depends
strategically upon the provision of adequate subsurface
drainage.
The goals of providing adequate aeration and
salinity control in irrigated lands have been translated
into a number of criteria upon which drainage systems
are designed. A brief review of these shows that most
criteria for design can be reduced to that of an
equivalent steady state condition.
Many theories have been developed for the design
of subsurface drainage systems. Some of these theories
derive exact mathematical solutions while others use
simplifying assumptions to derive approximate results
that can be applied to field conditions.
Most commonly used drainage theories are based on
the extensive use of the experimental law of Darcy which
postulates a linear relation between macroscopic velocity
and hydraulic gradient despite the acknowledged fact that
the law fails in flow situations of high Reynold's number.
In this study, approximate analytical solutions are
proposed for the water table profile between parallel
drains, along with drain spacing formulae which generalize
those conventionally used and based on the Darcy's linear
law. The validity of these proposed equations is investigated
experimentally using a sand tank seepage flow m
under high velocity flow regimes. They are found to
close agreements with experimental results as well as
with similar studies reported in the literature, and
provide for greater economy in drainage systems design.
Description
A Thesis Submitted in Partial Fulfillment
of the Requirements for the Degree of M.Sc. (Water
Resources Engineering) to the Postgraduate School,
Ahmadu Bello University, Zaria.
Keywords
NON-LINEAR,, SEEPAGE,, DRAINS.