Using Flexible Pipe (poly-pipe) with Surface Irrigation

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Aimed at farmers and irrigators who want to ir-rigate their crops using flexible plastic pipes (com-monly called “poly-pipe”), this publication high-lights (1) advantages of using poly-pipe, (2) factors to consider in selecting such pipe, and (3) consider-ations for installing it.

Advantages of Using Pipes to Deliver Irrigation Water

Using pipe systems (rather than earthen ditches) to convey and distribute water to fields has several advantages:

Increases in on-farm irrigation efficiency, by avoiding water loss due to deep percolation from earthen conveyance ditches.

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Better irrigation control. Fluctuations in ir-rigation-canal water levels are common. Using earthen ditches and siphon tubes requires in-tensive labor to avoid water spillage as a result of such fluctuations (for example, siphon tubes may lose their vacuums and stop working). In contrast, a pipe-irrigation system needs only to have an outlet opened to deliver water through the pipe to furrows; irrigation can be left unat-tended, even when fluctuations in water levels occur.

Assistant Professor and Extension Agricultural Engineering Specialist (Irrigation and Water Management); Extension Associate – Biological and Agricultural Engineering Department; Texas Cooperative Extension, The Texas A&M University System

Labor savings. In the Rio Grande Valley, water is distributed through canals coming from the river and is delivered at different outlets (called turnouts). Systems are designed to deliver one “head” of water at each turnout (one head equals approximately 3 cfs or 1,346 gpm). One turnout is installed for each 40-acre field. Farm-ers may have field-blocks larger than 40 acres, and sometimes farmers may irrigate several fields at the same time. With pipe-irrigation sys-tems, one irrigator can control six to eight irriga-tion fronts.