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What structure is surrounded around the tile drains when used in less pervious strata?

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+1 vote
in Irrigation Engineering by (75.2k points)
What structure is surrounded around the tile drains when used in less pervious strata?

(a) Envelope Filters

(b) French Drains

(c) Beehive Grate

(d) Surface Inlet

This question was addressed to me in exam.

I'd like to ask this question from Water Logged Reclamation in portion Water Logged Reclamation and Saline Soils for Agricultural Purposes of Irrigation Engineering

1 Answer

0 votes
by (106k points)
The correct choice is (a) Envelope Filters

The best I can explain: Envelope filters surround the tile drains when used in less pervious strata. These filters help in increasing the effective tile diameter and in turn help increasing the inflow rate, and also help in preventing the inflow of soil into the drains.

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