Difference between revisions of "Underground tank"

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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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Where access to groundwater is limited, rainwater harvesting in underground tanks can be an effective and low-cost solution. Water stored in the rainy season can be used in the dry season and lifted from the tank with a rope pump or with a FlexiEmas pump (see PVC pumps), which can elevate water up to 30 m. The government, with support from organisations such as UNICEF and IRCSA (International Rainwater Catchment Systems Association) started a programme to construct one million rainwatertanks in Brazil. Practica foundation is testing various options for low-cost storage and groundwater recharge like the "Reed cement tank" and the "Tube recharge"
  
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[[Image:Underground_tank.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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[[Image:Underground_tank.PNG|thumb|right|150px|Underground storage of rainwater in Bolivia ]]
  
 
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Easy to train on maintenance.
 
Easy to train on maintenance.
 
| valign="top" | Not all introduction programs have been successful.<br>
 
| valign="top" | Not all introduction programs have been successful.<br>
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== Capacity ==
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40 litres / min from 10 meters depth.
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== Costs ==
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* US$ 20-120 depending on model.
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== Applying conditions ==
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<ul>
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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]

Revision as of 21:55, 29 July 2007

Underground tank icon.png

Where access to groundwater is limited, rainwater harvesting in underground tanks can be an effective and low-cost solution. Water stored in the rainy season can be used in the dry season and lifted from the tank with a rope pump or with a FlexiEmas pump (see PVC pumps), which can elevate water up to 30 m. The government, with support from organisations such as UNICEF and IRCSA (International Rainwater Catchment Systems Association) started a programme to construct one million rainwatertanks in Brazil. Practica foundation is testing various options for low-cost storage and groundwater recharge like the "Reed cement tank" and the "Tube recharge"

Underground storage of rainwater in Bolivia
Advantages Disadvantages
Significantly cheaper than piston pumps.

Easy to maintain.
Easy to train on maintenance.

Not all introduction programs have been successful.


Capacity

40 litres / min from 10 meters depth.

Costs

  • US$ 20-120 depending on model.

Applying conditions

  • Numbers: 50,000 in Nicaragua, 20,000 in Mexico, Honduras, Guatemala, Ghana, Zimbabwe, Tanaznia, Senegal.
  • Range of depth: 1-35 meter (60 m with two cranks).
  • Application Communal wells, houshold, irrigation.
  • Cost of introduction: 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.

Rope pump building manual

PRACTICA foundation and the Technical Training Programme of the ETC Foundation (TTP/ETC) have put together a really excellent manual on how to build rope pumps (PDF, 2.5 Mbyte). It is an 86 page long document with detailed instructions.

External links

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