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| − | [[Image:Stone_hammer_well_drilling_icon.png|right]]
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| − | __NOTOC__
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| − | The previous drilling methods are not suitable for hard soil formations, so ongoing development led to the Stone-hammer. This method consists of a heavy hammer hitting directly on a hollow drill-head. Although it does not penetrate very hard stone such as basalt, it is a tougher option than the Rota-sludge method. This technology is being refined further in India and Nicaragua.
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| − | The Stone-hammer method has won a competition for innovative irrigation technologies organized by the World Bank, Winrock and IDE (International Development Enterprises).
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| − | [[Image:Stone_hammer_well_drilling.PNG|thumb|right|150px|The Stone-hammer in India, drilling a 20 m deep well in a stony layer ]]
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| − | {| border="1" cellpadding="5" cellspacing="0" align="center"
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| − | ! width="50%" style="background:#efefef;" | Advantages
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| − | ! style="background:#ffdead;" | Disadvantages
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| − | | valign="top" | Cheaper and easier to maintain than motorized drilling rigs.<br>
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| − | Drill in very hard soil<br>
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| − | | valign="top" | Slower than motorized drilling rigs.<br>
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| − | == Capacity ==
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| − | 2-5 inch wells to 40 meter.
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| − | == Costs ==
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| − | 20-60% less then hand dug wells.
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| − | == Applying conditions ==
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| − | <b>Cost of introduction:</b> Variable US$ 15,000 - 30,000 per project, including: production drill set, drawings, hands-on training, first wells.
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| − | {{Joinus}}
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| − | ==Stone Hammer Drilling Manual==
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| − | PRACTICA foundation and ETC Energy have put together a manual on the Rota Sludge & Stone Hammer drilling: [http://www.connectinternational.nl/files/Rota%20sludge%20and%20stonehammer%20drilling.pdf Volume I Drilling Manual], [http://www.practicafoundation.nl/wp-content/uploads/PDF/practica-production-rs-versie-1th-september-051.pdf Volume II Production Manual]
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| − | == External links ==
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| − | * [http://www.worldbank.org www.worldbank.org ]
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| − | * [http://www.practicafoundation.nl www.practicafoundation.nl ]
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