It is suggested to connect the Mediterranean Sea with the Dead Sea with a closed tunnel of diameter D=12.2 m and use the potential difference in levels to produce electric energy. What is the flow velocity corresponding to the maximum power produced?  

The data of the proposed system are:   

•Elevation Difference = 410 m  

•Distance between the seas (Channel length) is: (75,000 +100Z) m

•Turbine efficiency 90%

•Friction factor 0.01

•The tunnel inlet and outlet head losses are ignored.