| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an efficient freshwater storage system on an island having pervious ground. <P>SOLUTION: In a freshwater storage system which dams up freshwater with an underground impervious wall 4 on an island having pervious ground 62, the underground impervious wall is installed: with a lower end 42 of the impervious wall positioned above an impervious ground 63 or penetrated into the impervious ground 63 when the underground impervious wall is provided with permeable portions to allow water to pass therethrough; and with an upper end 41 of the impervious wall positioned above a groundwater level (a sea surface) 53 as well as below a ground surface 61, and thereby increasing a thickness of freshwater above the sea surface 53 by T and the thickness of the freshwater below the sea surface by 40T. <P>COPYRIGHT: (C)2013,JPO&INPIT |
