Difference between revisions of "Irrigation - Lay flat hose"
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| − | A. Phocaides. TECHNICAL HANDBOOK ON PRESSURIZED IRRIGATION TECHNIQUES. FAO. ROME, 2000. | + | A. Phocaides. [ftp://ftp.fao.org/agl/aglw/docs/pressirrig.pdf TECHNICAL HANDBOOK ON PRESSURIZED IRRIGATION TECHNIQUES.] FAO. ROME, 2000. |
Revision as of 01:34, 28 April 2012
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Irrigation sometimes involves transporting water over a long distance. Cement or clay canals are relatively costly, inflexible and cannot elevate water. PVC tubing or polypropylene (PP) hose is relatively expensive. In India, farmers started to use locally made plastic hose, called the lay-flat hose because the hose is flat when not in use. This hose is so cheap that even very low-income farmers can buy or rent it and irrigate their crops. It is often used for supplementary irrigation in unexpected dry periods in the rainy season. An additional advantage of lay-flat hose is that rolls are easy to transport and do not occupy valuable cropland as is the case with field channels.
Suitable conditions
| Advantages | Disadvantages/limitations |
|---|---|
| - Cheap to buy or rent. - Easy to transport. |
Construction, operations and maintenance
Layflat hose is made of soft PVC reinforced with interwoven polyester yarn. Layflat hoses are flexible, lightweight, and available in various sizes (millimetres or inches) from 1-6 in and for working pressures (PN) of 4.0-5.5 bars. They are manufactured with plain ends and supplied in coils in standard lengths of 25, 50 and 100 m.
There are no special connector fittings for layflat hoses. The hoses are connected by inserting small pieces of PE piping into the ends of the hoses, or by metallic quick couplings attached to both pipe ends. Small diameter PE tubes are used to connect laterals to the layflat manifolds. In these cases, wire ties are needed to secure the connections. However, several micro-irrigation industries have designed and manufactured special connector fittings for jointing their drip lines with layflat hoses.
Costs
Cost/100 m: (Yemen prices) US$ 20 - 30 (40 mm diameter). US$ 40 - 60 (80 mm diameter).
Field experiences
Reference manuals, videos, and links
(Lay-flat hoses are also mentioned in the book in technology innovation and promotion in practice: pumps, channels and wells.)
- TECHNICAL HANDBOOK ON PRESSURIZED IRRIGATION TECHNIQUES. A. Phocaides, FAO.
Acknowledgements
A. Phocaides. TECHNICAL HANDBOOK ON PRESSURIZED IRRIGATION TECHNIQUES. FAO. ROME, 2000.
