Completed dikes needs to be sealed with plastic sheeting to prevent water penetration. Distribute a layer of soil or sand 1-inch deep and about just one-foot huge together The underside on the dike on the water side. Tie off the sand baggage if you propose to move them. Or else, http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=2474320