Investigation of Hydraulical and Chemical Behavior of Dual Drain Envelopes (Organic and Synthetic) in Paddy Conditions with Two Different Water Qualities

Document Type : Research Paper


1 MSC Student, Water Engineering Department, Agricultural Sciences Faculty, University of Guilan

2 Assistant Professor, Water Engineering Department, Agricultural Sciences Faculty, University of Guilan


Drain envelopes play significant roles in the performance of drainage systems due to their
reduction in letting sediments into the drainpipes and also because of an increase in the
hydraulic conductivity of soil around the drainpipes. Throughout the present research, the
effect of a one 1000 hour flow on dual envelopes consisting of geotextile as a means of
improving the hydraulic gradient and rice husk as bio-sorbent, on the hydraulic and
chemical trends under paddy field conditions, with no rice crop, was considered. Towards
this end, a drainpipe covered with two different thicknesses of geotextile at a depth of 40
cm was installed on a physical model. Then the drain pipe was filled, using a 5 cm
thickness of rice husk. A thousand hour flow test, under two different water qualities of
0.7 and 1.9 dS/m was carried out, and while flow of drainage, EC, sodium absorption
ratio and pH of drained water being assessed. Results showed that the reduction of flow
rate of treatments of rice husk & thin geotextile with saline water (RNs), rice husk & thin
geotextile with water of ordinary quality (RN), rice husk & thick geotextile with ordinary
water quality (RV), as well as rice husk & thick geotextile with saline water (RVs) were
44, 94, 21 and 75 percent, respectively. But, in total, RN and RNs treatments presented
the maximum and minimum cloggings, respectively. Thickness of geotextiles affected the
flow rate and chemical trends, while the performance of rice husk, for all treatments, and
in saline conditions wasn’t appreciable.


Main Subjects

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