Selecting an appropriate crisis management plans during uncontrollable loading of pollution to water systems is crucial. In this research the quality of water resources against uncontrollable pollution is protected by use of suitable tools. Case study which was chosen in this investigation was a river-reservoir system. Analytical and numerical solutions of pollutant transport equation were considered as the simulation strategy to calculate the efficient tools to protect water quality. These practical instruments are dilution flow and a new tool called detention time which is proposed and simulated for the first time in this study. For uncontrollable pollution discharge which was approximately 130% of the river's assimilation capacity, as long as the duration of contact (T_c) was considered as a constraint, by releasing 30% of the base flow of the river from the upstream dilution reservoir, the unallowable pollution could be treated. Moreover, when the affected distance (X_c) was selected as a constraint, the required detention time that the rubber dam should detained the water to be treated was equal to 187% of the initial duration of contact.

在无法控制的水系统污染负荷中选择适当的危机管理计划至关重要。在这项研究中，通过使用适当的工具来保护不受不可控制的污染的水资源质量。本次调查选择的案例研究是河流-水库系统。污染物迁移方程的解析解和数值解被认为是模拟策略，用于计算保护水质的有效工具。这些实用工具是稀释流量和一种称为滞留时间的新工具，该工具在本研究中首次提出并进行了模拟。对于不可控制的污染排放，只要接触时间长短，大约是河流同化能力的130％（T _c）被认为是一个限制因素，通过从上游稀释水库释放30％的河流基流，可以处理不必要的污染。此外，当受影响的距离（X _Ç）作为一个约束，待治疗的所需停留时间，该橡胶坝应扣留的水等于接触的初始持续时间的187％。