| 摘要 |
The invention concerns a procedure for drawing water from a ground water store in such manner that the water obtained will contain the least possible amount of iron or manganese compounds, of hardness-inducing salts or of other detrimental impurities occurring in the ground water. The procedure is intended for use in those cases commonly encountered in practice where there is stratification in the occurrence of impurities in the ground water, and according to it at least two separate lifting pipes are inserted in the soil in different layers in accordance with the way in which the contents of impurities vary in different layers. From the lifting pipes water of different quality is then obtained, and the invention implies that water is simultaneously drawn with both lifting pipes, but only the water from that lifting pipe is conducted to normal consumption which is of better quality. The significance of the lifting of inferior quality water lies therein that thereby is reduced the water mixing between different layers, whereby the quality of the water conducted to consumption is constantly good. |
