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库容既定的围坝式平原水库，其坝高Ｈ有临界值ＨＲ，使得以Ｈ为自变量的水库投资函数Ｉ＝ｆ（Ｈ）有最小值Ｉｍｉｎ；本文简略分析了这个函数的具体表达式与ＨＲ的求解。
The reservoir capacity of established dam-type plain reservoirs, the dam height H has a critical value of HR, making H as an independent variable of the reservoir investment function I = f (H) has the minimum Imin; this paper briefly analyzes the specific expression of this function and HR solution.