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- W2335587795 abstract "It was 1912 that the water well drilling by means of a mechanical method was done for the first time in Japan. Since then, various kinds of drilling machines have been designed and developed.1. Construction methods for water wellThe purcussion method has gained recently a very high productivity of drilling, e.g.5-6 folds as much drilling speed as that of 20 years ago, by means of using tubular bit '.2. ScreensMany types of screens with various kinds of structure are now being manufactured, especially, the one with a high opening ratio is now widely used.3. PumpingThe main line of pumps for water wells are electro-submersible pump, with which safe-yield and conditions of aquifers are examined by means of draw-down test and recovery test in order to secure a rational discharge of groundwater." @default.
- W2335587795 created "2016-06-24" @default.
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- W2335587795 date "1972-01-01" @default.
- W2335587795 modified "2023-09-30" @default.
- W2335587795 title "Present Status of Drilling Technology for Groundwater Ressources Development of Japan" @default.
- W2335587795 doi "https://doi.org/10.5026/jgeography.81.5_344" @default.
- W2335587795 hasPublicationYear "1972" @default.
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