Two tube-well-drilling methodologies, sludging and well-pointing, are being used in the Terai region of Nepal for village water points in difficult ground conditions.
Title | The use of sludging and well-pointing techniques to sink small diameter tube-wels |
Publication Type | Journal Article |
Year of Publication | 1993 |
Authors | Whiteside, G, Trace, S |
Pagination | p. 8-11: 5 fig., photogr. |
Date Published | 1993-01-01 |
Keywords | manual drilling, nepal, tube wells |
Abstract | Two tube-well-drilling methodologies, sludging and well-pointing, are being used in the Terai region of Nepal for village water points in difficult ground conditions. These two techniques are simple, require participation among the villagers, require a minimum of equipment, and cost less than US$ 2.000 per tube-well. Sludging consists of "lifting" mixed volumes of soil and water in a long pipe by suction, and can be used in areas where the permanent water table lies within the atmospheric suction limit to a depth of approximately 60 meters. Well-pointing/hammering consists of forcing a conical driver through obstructions; then continuing with the sludging process. The disadvantage of this system is that little knowledge is gained concerning the hydraulic characteristics of the aquifer; therefore the reliability of the water source cannot be estimated. |
Notes | 2 ref. |
Custom 1 | 212.5 |