所谓设计保证率，则是根据各用水部门的特征所允许的减少供水范围，定出在多年期间用水部门正常工作所能得到保证的程度，以百分数计，即所谓正常用水保证率，由于此值是在设计水库时研究决定的，故称为设计保证率。
根据多年库容的概念，采用试算法计算了设计保证率下的多年库容。
Based on the concept of carryover storage of reservoir, the carryover storage of reservoir under the design pmba- bility is calculated with the trial method.
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。
Rainfall frequency analysis is used commonly to determine probability of irrigation water requirement, and to choose typical years for irrigation project design.
因此，通用投入了太多精力在游说议会以保证大型车的销售上；而非通过对燃料效率、生产率、和设计进行革新来获取利润。
Therefore, instead of focusing on making money by innovating around fuel efficiency, productivity and design, G.M. threw way too much energy into lobbying and maneuvering to protect its gas guzzlers.
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