Abstract
It was believed that the underground water level be controled by the canunals so called “Hamamizo”. But I wrote this report to define the mechanism of the movement of the water table in the salt field bed.
The results of this research taught us as follows:(i) The flow line, that penetrates down into the sand bed, near the obstacle (dike), goes through slowly toward low level, and changes the derection, at some point and at last percolates out near the dike, these distance are almost same length without some exceptions.(No.34-38)
(ii) The water table of the salt field are effected by ebb and flow of the tide.
(iii) If there is a sand-bar near the dike, the effect of percolated water through the bed be shown distinctly on the surface of the bed and the sphere of activity is symmetrical the sand bar.
(iv) Thn it is necessary to pay attention that we must build the salt field with four side-dikes, and the cannal between them may be as wide as possible.
