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Design of drip irrigation system using microtubes

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ABSTRACT: To obtain the best emission uniformity in drip irrigation the pressure regulators and pressure compensating emitters are in use since long back. In contrast, clogging has been the major obstacle, particularly in areas with brackish water where problems of precipitation of calciumcarbonate, organic materials and suspended sands are severe. Microtubes as small bore polyetln;lene tubes of appro:ximately 2.0-4.0 mm internal diameters can be used to deliver equal discharges, by varying its length to adjust varying heads along a given lateral. These microtubes can be simpler than inside passages of those traditional drippers and thus will be less susceptible to clogging. The computed set of varying length micro tubes that are emitting equal flows at the end-lateral can be copied to subsequent laterals of the manifold to work them as larger emitters with a characteristic pressure-discharge relationship. As such the variation of flow through these laterals is restricted by limiting their number to have emission uniformitt; EU > 90%. For case studies on flat-ground for a given set of lateral diameters (1 0-16 mm), the exponents in the pressure-discharge relationship varied narrowly: 0.60-0.69 for larger discharges and 0.78-0.84 for smaller discharges. Similarly on sloping terrain at S = 0.25% and 0.5%, the exponents varied relatively widely: 0.62-0.92 and 0.84-0.95 for larger and smaller discharges, and 0.65-0.97 and 0.85-0.99 for larger and smaller discharges, respectively. It can be reasoned that these laterals function as long path emitters. Variation of the corresponding microtube lengths can be around 0-85%, 0-460% and 0-810% longer than the given minimum length (lmi" = 1.25 m), respectively. When the required discharges and diameters ofmicrotube, lateral and manifold and other ground conditions are given, the length of the micro tubes, the pressure heads, emission uniformity and the best subunit dimensions can be obtained using the algorithm developed in this research.

KEYWORDS: Drip irrigation; microtubes; laterals; emission uniformity; pressuredischarge
relationship.

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Ketersediaan

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Informasi Detail

Judul Seri

Australian journal of Civil Engineering

No. Panggil

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Penerbit

Australia : Institution of Engineers Australia,., 2013

Deskripsi Fisik

Australian journal of Civil Engineering, Volll No 1

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

TEKNIK SIPIL

Info Detail Spesifik

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Pernyataan Tanggungjawab

mutia

Versi lain/terkait

Lampiran Berkas

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