In a tidal barrage scheme, the area of sea-water behind the barrage is 30km^2, tidal depth is 10m and the density of sea water is 1030kgm^-3.

a. What energy is possible available from this scheme in one cycle of ebb and flow???

To calculate the energy available from a tidal barrage scheme, you need to know the area of the sea-water behind the barrage, the tidal depth, and the density of the sea water.

The energy available from a tidal barrage scheme can be calculated using the following formula:

Energy = 0.5 * Area * Tidal Depth * Density * Gravitational Acceleration

Where:
- Area is the area of the sea-water behind the barrage
- Tidal Depth is the difference in water level between high tide and low tide
- Density is the density of sea water
- Gravitational Acceleration is the acceleration due to gravity

Let's plug in the given values into the formula:

Area = 30 km^2 = 30,000,000 m^2
Tidal Depth = 10 m
Density = 1030 kg/m^3
Gravitational Acceleration = 9.8 m/s^2

Energy = 0.5 * (30,000,000) * (10) * (1030) * (9.8)

Now, let's calculate the energy:

Energy = 0.5 * 30,000,000 * 10 * 1030 * 9.8

This calculation will give you the energy available from this tidal barrage scheme in one cycle of ebb and flow.