水文年：按总体蓄量变化最小的原则所选的连续十二个月，据此，跨年度的水量可减至最低限度。 一个自然水文年：从当年的第一次涨水当月的第一天开始起算12个月，也就是汛期的当月开始算往后12个月，一般地区都是从3月或4月到次年的2月或3月。
南港河段每年受到盐水入侵影响，但不同水文年入侵程度相差悬殊。
The water quality in the South Channel is affected by the saltwater intrusion each year, but the intensity varies greatly with different hydro-logic years.
通过长系列的降雨资料确定了水文年，通过考虑时间序列预测了未来一段时期的水文状况。
The hydrological year was determined by long series rainfall data and the hydrological regime was predicated by considering time series method.
从数理经济学观点出发，研究了以资源边际产量为条件的经济用水定额，提出了华北地区不同水文年的各种作物经济用水定额。
From the viewpoint of mathematical and economic theories, the economic water use quota was studied based on the minimum resource input and maximum output.
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