Load of reservoir water is transferred to soil by trust action and vertical action. Arch dam is mostly use in following conditions
- Abutment is strong.
- Water depth of reservoir is High.
- Valley between two mountain.
- Bottom soil have low SBC.
Reservoir water load is transferred to soil by vertically and buttress wall of the dam. Buttress dam is mostly use in following condition
- Dam height is very high.
- Where dam width is very high.
- Abutment are weak.