Final answer:
Devices that can be used to increase the water level at the small hydro intake include entrainment devices, run-of-the-river systems, and tidal power systems..
Step-by-step explanation:
There are several devices that can be used to increase the water level at a small hydro intake. Here are a few examples:
1. Sluice gates: Sluice gates are commonly used to control the flow of water in a canal or channel. By adjusting the position of the gates, the amount of water entering the intake can be regulated, which in turn affects the water level.
2. Dams or weirs: Dams or weirs can be constructed across a river or stream to raise the water level upstream. These structures create a reservoir of water that can then be channeled towards the hydro intake.
3. Siphons: Siphons use the principle of atmospheric pressure to transfer water from a higher elevation to a lower elevation. By utilizing a vacuum effect, water can be drawn into the intake from a source at a higher elevation, effectively increasing the water level.
4. Pumping systems: In some cases, pumps may be used to increase the water level at a small hydro intake. These pumps can draw water from a lower source or reservoir and deliver it to the intake at a higher level.