Rainfall frequency analysis is used commonly to determine probability of irrigation water requirement, and to choose typical years for irrigation project design.
灌区灌溉设计中，常用降雨量进行频率分析来选取灌溉设计保证率及其对应典型年。
The thesis discusses the whole course of developing NanTong networked water geographical information system from requirement analysis to implement.
论文讨论南通市网络化水利地理信息系统从需求分析到系统实施评价全过程。
Based on the analysis of field experimental data, crop water requirement and crop coefficient of straw-mulched summer maize are evaluated with dual coefficient approach recommended by FAO.
采用FAO推荐的双作物系数法计算了秸秆覆盖条件下夏玉米的作物系数。
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