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 plant has a water height of 100 meters.
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 capacity per 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 steel water diversion pipe with an inner diameter of 12.3 meters. the flow rate is approximately over 900 cubic meters/second.
To produceelectricity 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 river embankments along the coast must be built far enough 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.
What is the minimum hydroelectric power generation capacity? What is the required water pressure difference and water quantity?
It also depends on the water height (water head). that the head is H (m), the flow rate is Q (m3/h), the power is P (kW), the density of water is d (1000kg/m3), the acceleration of gravity g = 10m/s2, considering the conversion efficiency μ, there is a relationship: P = μdgHQ/3.6, if: μ=0.6, P=5kW, d=1000kg/m3, H = 2m, then Q = 3.6P/(μdgH) = 3.6x5/(0.6 x1x10x2)= 1.5m3/hour.
That is, when the generator has a height difference of 2 meters and a conversion efficiency of 0.6, the required water flow is about 1.5 meters cube per heure.
Hydroelectric power production theoretically has no minimum power. It can be as small as 1 W or as large as a million KW. It is simply a matter of designing a more economical and reasonable installation based on the hydroelectric land. terms. Of course, a 1W hydroelectric generator. It must be a clinker toy for children to play at home. In reality, it is at least several hundred kilowatts.
Concerning the questions of water pressure and volume... Of course, units of different capacities require different water heights and flow rates. different. Think about hydraulic turbines. Is it mixed flow, axial flow, impact or perfusion? I can't explain it in a few words.
Also, I don't understand why you are asking this question. Are you considering investing in a hydroelectric plant? or are you interested in hydroelectrictricity after graduating from high school? Industry...etc.