The Xin’an River tourist channel is located in a river with rapids and fast currents,and significant water level variations,posing difficulties in determining the highest navigable water level as a key design parameter for the channel.To address this problem,a hydrodynamic mathematical model of a long river section with multiple hydro projects is established on the basis of measured data.According to the flow conditions for safe navigation of ships,the maximum navigable discharge of the channel is first determined:bounded by the deep channel at the perennial backwater end of the Xin’an River Reservoir,the upper part corresponds to an incoming discharge of 600 m3/s at Tunxi Station,with a corresponding flow assurance rate of 3.33%,and the lower part corresponds to a 3-year return period discharge at Tunxi Station.Considering the joint operation of hydro projects,the maximum navigable water levels along the route are calculated through a mathematical model and provided in sections:from the downstream of the Hubian hub dam to the upstream of the Zhelin hub dam,from the upstream of the Zhelin hub dam to the downstream,from the downstream of the Zhelin hub dam to the upstream of the Meitan hub dam,and from the upstream of the Meitan hub dam to the downstream,respectively,are 117.6,116.4,111.3,108.4,105.1,108.55 m.The annual effective navigation assurance rates for the channels above and below the deep channel are 91.67% (with 3.33% and 5% losses at high and low water levels,respectively) and 95% (with only a 5% loss due to low water levels).