Difference between revisions of "Bamboo screens"

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{{Language-box|english_link= Bamboo screens | french_link= Coming soon | spanish_link= Coming soon | hindi_link= Coming soon | malayalam_link= Coming soon | tamil_link= Coming soon | korean_link= Coming soon | chinese_link=竹滤网 | indonesian_link= Coming soon | japanese_link= Coming soon }}
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[[Image:Bamboo_screens.PNG|thumb|right|200px|Low-cost bamboo screens that improve pumping efficiency, 4m long. Photo: NWP.]]
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Small-scale irrigation in India usually involves the use of diesel or electric-powered suction pumps, drawing water from water tables down to 7 m deep. The India-North Bengal Terai Development Project carried out pump energy analysis, which showed that tube well screens excessively restricted water flow, resulting in low overall pumping efficiency. Improving these screens resulted in a reduction of fuel consumption of over 40%. Since publication of this innovation, thousands of wells have been fitted with the new screens, with benefits for the profitability of farming and for reducing CO2 emissions.
  
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For wells down to 35 m, rope pumps are often five times cheaper and more sustainable than piston pumps. Evaluations show that rope pumps on communal wells are being maintained by the users, if introduced properly. 90% of rope pumps remain operational, even after many years. Because of its low cost, the pump is also popular for domestic use. A survey among 5,025 rural families in Nicaragua indicates that a rope pump increases income, even if used for domestic purposes only. Families with a pump earn US$ 220 per year more than families without a pump. In Nicaragua the pumps are now being  produced commercially by 20 workshops. Different models of Rope pumps were introduced in Africa. This introduction has not always been successful: in some projects over 80% of the pumps do NOT work! However, with the "right" models and the "right" user training, upto 90% remain in operation in Africa, as the Victory model in Ghana and the Elephant model in Zimbabwe have proved.
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Bamboo screens are mainly used for irrigation purposes.
  
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[[Image:Bamboo_screens.PNG|thumb|right|150px|[[Rope pump | Rope pump ]], (Victory model) on a hand-dug of 20 meters deep well, made in a local workshop in northern Ghana ]]
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===Suitable conditions===
  
 
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! width="50%" style="background:#efefef;" | Advantages
 
! width="50%" style="background:#efefef;" | Advantages
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! style="background:#ffdead;" | Disadvantages
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! style="background:#f0f8ff;" | Disadvantages
 
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| valign="top" | Significantly cheaper than piston pumps.<br>
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| valign="top" | Reduce fuel consumption of irrigation normally used for pumps.<br>
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Easy to maintain.<br>
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| valign="top" | <br>
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Easy to train on maintenance.
 
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| valign="top" | Not all introduction programs have been successful.<br>
 
 
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===Construction, operations and maintenance===
  
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== Capacity ==
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15 litres / sec (3 inch well, length of screen 4 meter).
  
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40 litres / min from 10 meters depth.
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===Costs===
  
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== Costs ==
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New screen costs 20% of a conventional model.
  
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* US$ 20-120 depending on model.
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===Manuals, videos and links===
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* [http://www.practicafoundation.nl www.practicafoundation.nl Practica Foundation]
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* [http://www.teriin.org www.teriin.org TERI] (In 2002, TERI published a book on the subject, entitled Technology innovation and promotion in practice: pumps, channels and wells.)
  
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== Applying conditions ==
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===Acknowledgements===
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<ul>
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* [http://www.arcworld.org/downloads/smart%20water%20solutions.pdf Smart Water Solutions: ''Examples of innovative, low-cost technologies for wells, pumps, storage, irrigation and water treatment.''] Netherlands Water Partnership (NWP). Third edition, 2006.
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<li><b>Numbers:</b> 50,000 in Nicaragua, 20,000 in Mexico, Honduras, Guatemala, Ghana, Zimbabwe, Tanaznia, Senegal.</li>
 
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<li><b>Range of depth:</b> 1-35 meter (60 m with two cranks).</li>
 
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<li><b>Application</b> Communal wells, houshold, irrigation. </li>
 
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<li><b>Cost of introduction:</b> US$ 10,000-20,000 per project, including 20 pumps, engineering and hands-on training. US$ 60,000-100,000 per project, including 1,000 pumps, production workshop and hands-on training.</li>
 
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</ul>
 
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== Rope pump building manual ==
 
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PRACTICA foundation and the Technical Training Programme of the ETC Foundation (TTP/ETC) have put together a really [http://www.greenocean.org/akvo/PRACTICA_180306_Rope_pump_manual_Ethiopia_March_2006_complete.pdf excellent manual on how to build rope pumps] (PDF, 2.5 Mbyte). It is an 86 page long document with detailed instructions.
 
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== External links ==
 
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* Evaluations [http://www.irc.nl www.irc.nl ]
 
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* Africa [http://www.pumpaid.org www.pumpaid.org ]
 
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* General info [http://www.ropepump.com www.ropepump.com]
 
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* How to build [http://www.ropepumps.org www.ropepumps.org]
 

Latest revision as of 01:45, 10 November 2015

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Bamboo screens icon.png
Low-cost bamboo screens that improve pumping efficiency, 4m long. Photo: NWP.

Small-scale irrigation in India usually involves the use of diesel or electric-powered suction pumps, drawing water from water tables down to 7 m deep. The India-North Bengal Terai Development Project carried out pump energy analysis, which showed that tube well screens excessively restricted water flow, resulting in low overall pumping efficiency. Improving these screens resulted in a reduction of fuel consumption of over 40%. Since publication of this innovation, thousands of wells have been fitted with the new screens, with benefits for the profitability of farming and for reducing CO2 emissions.

Bamboo screens are mainly used for irrigation purposes.

Suitable conditions

Advantages Disadvantages
Reduce fuel consumption of irrigation normally used for pumps.

Construction, operations and maintenance

15 litres / sec (3 inch well, length of screen 4 meter).

Costs

New screen costs 20% of a conventional model.

Manuals, videos and links

Acknowledgements

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