|
|
| (5 intermediate revisions by 3 users not shown) |
| Line 1: |
Line 1: |
| − | [[Image:Stone_hammer_well_drilling_icon.png|right]]
| |
| | | | |
| − | 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).
| |
| − |
| |
| − | [[Image:Stone_hammer_well_drilling.PNG|thumb|right|150px|The Stone-hammer in Nicaragua, drilling a 20 m deep well in a stony layer ]]
| |
| − |
| |
| − | {| border="1" cellpadding="5" cellspacing="0" align="center"
| |
| − | |-
| |
| − | ! width="50%" style="background:#efefef;" | Advantages
| |
| − | ! style="background:#ffdead;" | Disadvantages
| |
| − | |-
| |
| − | | valign="top" | Cheaper and easier to maintain than motorized drilling rigs.<br>
| |
| − | Drill in very hard soil<br>
| |
| − | | valign="top" | Slower than motorized drilling rigs.<br>
| |
| − | |}
| |
| − |
| |
| − |
| |
| − | == Capacity ==
| |
| − |
| |
| − | 2-5 inch wells to 40 meter.
| |
| − |
| |
| − | == Costs ==
| |
| − |
| |
| − | 20-60% less then hand dug wells.
| |
| − |
| |
| − | == Applying conditions ==
| |
| − |
| |
| − | <b>Cost of introduction:</b> Variable US$ 15,000 - 30,000 per project, including: production drill set, drawings, hands-on training, first wells.
| |
| − |
| |
| − | == External links ==
| |
| − | * [http://www.worldbank.org www.worldbank.org ]
| |
| − | * [http://www.practicafoundation.nl www.practicafoundation.nl ]
| |
