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1. How to determine the ecological flow when there is a water reduction in the river channel?
The ecological flow during the water reduction in the river channel needs to be determined comprehensively based on the current hydrological conditions, established ecological protection goals, and the functional positioning of the river channel. The core is to ensure that the river channel does not experience functional interruption and maintain the stability of the basic ecosystem. Priority adherence to national regulations: Referring to the current standards of Shengsheng such as the "Method for Determining Ecological Flow of Rivers and Lakes" (SL 712-2023), based on the approved ecological flow bottom line of the river channel, priority should be given to ensuring that the bottom line is not exceeded under water reduction conditions. 2. Conduct on-site update verification: measure the actual runoff, water level, and cross-sectional morphology of the current river channel, investigate the reasons for water reduction (such as upstream water intake and seasonal drought), and synchronously clarify the core ecological protection needs of the current period, such as the hydrological conditions required for endangered fish spawning and migration. Ensure no less than the minimum ecological flow requirement; （2） When the reduction in water volume is significant, the minimum survival flow rate is determined using methods such as wet cycle method and 7Q10 method to ensure the basic water level and flow velocity of the river channel are maintained, and to avoid local river sections from being cut off; （3） For river sections with special protected objects: Combining ecological hydraulic simulation method to ensure that th
4. Coordination of overall functions: If the river has both water supply, irrigation and other livelihood functions, it needs to be reasonably allocated between ecological flow and water demand. During extreme dry seasons, priority should be given to ensuring ecological base flow, which can be alleviated by optimizing water intake scheduling, cross regional water replenishment and other methods.
5. Dynamic adjustment: Based on subsequent water inflow situation and ecological monitoring results, timely optimization of ecological flow guarantee plan should be carried out to avoid long-term maintenance of low flow leading to ecological degradation
6. Risk warning: Unauthorized reduction of ecological flow without scientific assessment may cause loss of aquatic habitats and riverbank vegetation.
Degradation and other issues require strict adherence to regulations.2. How to calculate the ecological water demand in rivers?
1. The commonly used method for estimating ecological water use in rivers is the Tennant method, also known as the Montana method, which is a hydrological method. This law recommends river base flow based on the percentage of annual average flow, taking into account the protection of fish, wildlife, and related environmental resources. The Tennant method is mainly used to evaluate the degree of development and utilization of river water resources, or as a recommended value for studying river flow in low priority river sections, or as a test for other methods. The Tennant method determines the ecological water demand in river channels into different levels bas
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