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水位频率表中,各级水位發生的頻率用下式進行計算水位頻率=发生日数/全年日数×100% 由于水位級分得很多,每一个水位級發生的頻率都按此式進行計算,不勝麻烦,故可簡化如
In the water table, the frequency of water level at all levels is calculated by the following formula. Water frequency = Number of occurrences / Number of days in a year × 100% The frequency of each water level is calculated due to the large number of water levels. Trouble, it can be simplified as