1. lots of water volume

2. river is dropping rapidly in elevation, there fore has speed

3. there’s a natural canyon or valley that will become a new resevoir

4. There’s good bed rock to anchor the dam on

5. Not too far from the cities that need the power

Factors that make it difficult:

1. Slow, meandoring river

2. not much water volume

3.valleys not well defined, flat land won’t form good lake

4. sandy soil

5. frequent floods

6. frequent droughts

7. far from cities that need the power

Dams, which used backed up water as stored up energy, alter the local environment, sometimes for the worst. These alterations might break environmental laws which could cause dams to be either not built or taken down.

Easy:

This year scientists discovered that salt water burns when it is hit by certain radio waves.

Wave generated electrictiy is renewable energy.

difficult: loss of area due to increased size of floodplain; lack of suitable water source; public opposition