Difference between revisions of "Groundwater - Stone hammer well drilling"
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== External links == | == External links == | ||
| − | * | + | * [http://www.worldbank.org www.worldbank.org ] |
| − | * | + | * [http://www.practicafoundation.nl www.practicafoundation.nl ] |
Revision as of 13:49, 28 July 2007
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.
The Stone-hammer method has won a competition for innovative irrigation technologies organized by the World Bank, Winrock and IDE (International Development Enterprises).
| Advantages | Disadvantages |
|---|---|
| Cheaper and easier to maintain than motorized drilling rigs. Drill in very hard soil |
Slower than motorized drilling rigs. |
Capacity
2-5 inch wells to 40 meter.
Costs
20-60% less then hand dug wells.
Applying conditions
Cost of introduction: Variable US$ 15,000 - 30,000 per project, including: production drill set, drawings, hands-on training, first wells.
