Determination of ecological flow thresholds for rainfall-recharging rivers based on multiple hydrological methods

Given the threats to regional river ecological flow, including sharp increase in per capita water demand, number of hydraulic engineering, and strong seasonal runoff rainfall recharge channels, we clarified appropriate flow thresholds for middle reaches Bailong River northwest China. Based on monthly data Wudu Hydrological Station from 1990 2020, seven suitable hydrological methods were used couple estimation River, which tested by satisfaction level analysis, using quadratic fit 95% confidence interval determine threshold study area. The results single showed that calculation minimum method, improved RVA Tennant DC method four better methods, had a more than 90% whole year. diversion power station whose main task aimed at generation. Although economic benefits hydropower stations when was calculate analyzed extremely poor November April following year, could not meet requirements biological community channel. While other five all this requirement. We suggest maintained 27.28 m 3 ?s, maximum retained 116.33 ?s. line with dynamics area, improve accuracy protection. be may provide reference follow-up restoration research management similar zones.