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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.

TitleThe use of sludging and well-pointing techniques to sink small diameter tube-wels
Publication TypeJournal Article
Year of Publication1993
AuthorsWhiteside, G, Trace, S
Paginationp. 8-11: 5 fig., photogr.
Date Published1993-01-01
Keywordsmanual 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.

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