Proposed Gravel Filters for Pipe-drain to Improve the Efficacy of the Drainage System under Drip Irrigation
QIN Wenbao
LI Mingsi
LI Yufang
LIU Hongguang
Abstract：We developed two gravel filters to resolve the difficulties associated with pipe-drain used to drain farm-land under drip irrigation when soil is under unsaturated condition. Soil tank experiment was conducted to test their efficacy in comparison with conventional filter in which fine sands were laid around the drain pipe. In the proposed filters, fine sands were either laid on the top of the drain pipe (T2), or obliquely connected tothe pipe. The results showed that in contrast to the control in which there was a significant delay or failure in drainage and-water and salt accumulated on the bottom of the pipe, the proposed two filters produced a local saturated zone above the pipe, facilitating water movement and drainage. The T3 filter took less time to drain the water than T2 and was hence more efficient to drain water and salt out of the soil.
Keywords：drip irrigationburied pipe drainagesalt leachinggravel envelope structure
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 80-85 )