Underwater generators can be installed!
1m^3 of water has a weight of mg=1000kgm/s^2
With a fall of 2m, the potential energy is mgh=2000kgm/s
p>< p>That is, the power is 2000 W.
The efficiency of a small underwater generator is calculated as 60%, and the output power can reach 1.2 kW.
You can build a dam 120 meters high. Of course, the embankments on both sides of the river should be raised accordingly according to the actual situation to ensure that your power station has a 100 meter high dam. high water height.
According to your description, the water volume of the large canal is 2*3*0.7*0.5=2.1m^3/s (due to the shear force of the 'water, the water flow speed at the bottom cannot reach 0.7 m/s, due to the lack of parameters, it is difficult to calculate, so let's take it as half). Then, the water storage capacityper day is 362,880 cubic meters. I suggest you be more aggressive and choose a 700MW hydroelectric generator currently widely used in large hydropower projects in China. Use a water diversion steel pipe with an inner diameter of 12.3 meters. the flow rate is approximately more than 900 cubic meters/second.
To produce electricity for 1 hour, it takes approximately 900/2.1=428 hours=18 days to store water.
The amount of water flowing through the turbogenerator during this period is 900*3600=3240000 cubic meters
The amount of water flowing through the channel is relatively negligible.
If you want to produce electricity, you must maintain a high water level. It is recommended that it be greater than 80 meters. Then the reservoir area of your hydropower plant must be greater than 3240000/(100. -80)=162,000 square meters
p>Therefore, the digRivers along the coast should be built far enough away to ensure that the headwaters will not be threatened when the water storage height is 100 meters.
Then after 18 days of water storage, you can open the portal to release water to generate electricity for 1 hour, then close the portal.
Since you have such awesome power generation equipment, you no longer need to sell electricity to power plants. You can connect it directly to the national grid and purchase it for China Power.