根据物质不灭定律面，对于任意地区在定时段内输入的水量与输出的水量之差，必等于区域内蓄水量的变化，这就是水量平衡原理。
最后以海河流域水量平衡模拟为例，检验了其有效性。
The effectiveness of the proposed method is verified by the application to the analysis on water balance in Haihe River basin.
结果表明，绕阳河上游流域水量平衡中蒸散是水分输出的主要形式。
The results showed that the evapotranspiration was the main form of water output in the upper reaches of Raoyang River Watershed.
然后以传统的分项还原法为理论基础、结合水量平衡原理、蓄满产流理论以及流域水文特性，提出适合浙江省河川径流还原的产流差值法。
Then, it gives a new flow interpolation method, based on traditional subentry regeneration and water budget balance and watershed hydrologic feature, to fit for the streams in Zhejiang Province.
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