Soil water resource calculating model of piedmont plain was establishedmacroscopically. Based on the effective precipitation, the model could be used in smallscope of plain.
③宏观上，确定了平原区土壤水资源计算模型——基于有效降水量的土壤水资源计算模型，并对其中各个土壤水资源补给项的计算方法进行了确定。
参考来源 - 河北山前平原土壤水资源计算模型与方法研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The results indicated that effective precipitation increased 30% about by artificial precipitation operation for Yanhu district in 2001.
通过计算得出2001年人工增雨作业为盐湖区增加了30%左右的有效降水。
In soil-plant-atmosphere system, soil available water content, crop water consumption, and effective precipitation are the main factors in water balance equation of farmland.
在土壤-植物-大气系统中，土壤有效水分贮存量、作物耗水量和有效降水量是农田水分平衡的主要组成因子。
It is necessery that the total consumptive use of water in the rotation period is equal to the total effective precipitation(pre- cipitation minus runoff depth)in the loess hilly region.
在黄土丘陵区要求林草与农作物地在轮作周期内的总耗水量与有效雨量（降雨量与径流深之差）持平。
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