Cultivators dug wells, or even broke down tidal barriers or dikes. This led to salination of the earth and problems for layers of the earth below the surface as well as for flood prevention.
養殖戶只好自行鑿井埋管抽水，甚至不惜破壞防潮閘門及海堤，於是慢慢造成了土地鹹化，部分地區地層下陷，居民防洪安全堪慮等問題。