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Underground tank

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[[Image:Underground_tank_icon.png|right]]

For wells down Where access to 35 mgroundwater is limited, rope pumps are often five times cheaper rainwater harvesting in underground tanks can be an effective 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, solution. Water stored in the pump is also popular for domestic use. A survey among 5,025 rural families rainy season can be used in Nicaragua indicates that the dry season and lifted from the tank with a rope pump increases income, even if used for domestic purposes only. Families or with a FlexiEmas pump earn US$ 220 per year more than families without a pump. In Nicaragua the (see PVC pumps are now being produced commercially by 20 workshops), which can elevate water up to 30 m. Different models of Rope pumps were introduced 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 AfricaBrazil. This introduction has not always been successful: in some projects over 80% of the pumps do NOT work! However, with Practica foundation is testing various options for low-cost storage and groundwater recharge like the "rightReed cement tank" models and the "rightTube recharge" user training, upto 90% remain in operation in Africa, as the Victory model in Ghana and the Elephant model in Zimbabwe have proved.

[[Image:Underground_tank.PNG|thumb|right|150px|[[Rope pump | Rope pump ]], (Victory model) on a hand-dug Underground storage of 20 meters deep well, made rainwater in a local workshop in northern Ghana Bolivia ]]

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Easy to train on maintenance.

| valign="top" | Not all introduction programs have been successful.<br>

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== Capacity ==

 

40 litres / min from 10 meters depth.

 

== Costs ==

 

* US$ 20-120 depending on model.

 

== Applying conditions ==

<ul>

<li><b>Numbers:</b> 50,000 in Nicaragua, 20,000 in Mexico, Honduras, Guatemala, Ghana, Zimbabwe, Tanaznia, Senegal.</li>

<li><b>Range of depth:</b> 1-35 meter (60 m with two cranks).</li>

<li><b>Application</b> Communal wells, houshold, irrigation. </li>

<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>

</ul>

 

== Rope pump building manual ==

 

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.

 

== External links ==

* Evaluations [http://www.irc.nl www.irc.nl ]

* Africa [http://www.pumpaid.org www.pumpaid.org ]

* General info [http://www.ropepump.com www.ropepump.com]

* How to build [http://www.ropepumps.org www.ropepumps.org]

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