An Analytical Model For Predicting Transient
Flow Into Equally Spaced Ditch Drains Receiving
Water From A Uniformly Ponded Field
Author(s)
G. Barua & W. Alam
Abstract
An analytical solution is worked out for predicting transient seepage into a
network of parallely spaced ditch drains in a homogeneous and anisotropic soil
overlying an impervious barrier and receiving water from a uniformly ponded
field. The distance between the adjacent drains is assumed to be the same and the
level of water in all the ditches are all considered as equal in the analysis. In
order that only two-dimensional flow prevails in the flow spaces in between the
drains, it is further assumed in the mathematical procedure that the field is of
infinite extent. The correctness of the develop model is established by
performing a MODFLOW check on it for a considered ditch drainage situation.
The study shows that the rate of water entry at the surface of a soil from a
uniformly ponded field to the ditch drains is of a relatively better uniformity at
early times of a simulation and that this uniformity gets progressively reduced
with the passage of time, particularly for situations where the anisotropy ratio (it
is a quotient between the horizontal and vertical saturated hydraulic
conductivities of a soil) of the soil is low. Further, the transient state duration of
a ponded ditch drainage scenario may be considerable if the drains are being laid
in a soil having low directional conductivity values and a high anisotropy ratio,
more so if the drains are being installed relatively deeper into the ground. The
solution provided here is important as it can be successfully employed for
designing a network of ditch drains for cleaning a salt affected soil and also in
reclaiming a water-stagnated area.
Keywords: analytical solution, ponded field, equally spaced ditch drains,
saturated directional conductivity, specific storage, anisotropy ratio, uniform
depth of ponding.
Keywords
Keywords: analytical solution, ponded field, equally spaced ditch drains,
saturated directional conductivity, specific storage, anisotropy ratio, uniform
depth of ponding.
Related Book
Other papers in this volume
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