Statistics show that the quantity of flood waters increased by 40 percent in the 1970s over the 1960s, while the dry months were drier and droughts more frequent and longer.
根據海南島三大長川﹘﹘南渡河、萬泉河，與昌化江水文站的資料顯示：洪水期，七○年代水量較六○年代增加百分之四十；枯水月流量則減少，旱期變頻、變長。