How does a buttress dam work?
A buttress dam or hollow dam is a dam with a solid, water-tight upstream side that is supported at intervals on the downstream side by a series of buttresses or supports. Water pushes against the dam, but the buttresses are inflexible and prevent the dam from falling over.
Which is the most suitable foundation for buttress dam?
Buttress Dams are suited to sites with either wide or narrow valleys but, like gravity dams, it is necessary that they are built on a solid foundation of bedrock.
What are arch and buttress dams?
see arch dam in figure. it is constructed when river run between two hills and the dam site has great depth, and less width at that location arch dam is very economical to another type of dam. buttress dam is a dam in which has straight alignment and which have buttressed support on the downstream side.
What is a spillway used for?
Spillways are structures that either form part of a dam, or are found just beside one. They are used, when a reservoir is full, to pass floodwater safely, and in a controlled way, over a dam, around it or through it. Next time you visit a dam, look for its spillway.
Which dam requires 40 to 50% less material as compared to gravity dam?
Explanation: The Hollow Masonry Gravity dam contains less concrete or masonry (about 35 to 40%) than solid masonry gravity dam.
What is site selection criteria for dam?
Site Selection Criteria for Dam
- Suitable foundation must be available.
- For economy, the length of the dam should be as small as possible and for given height it should store maximum amount of water.
- A suitable site for the spillway should be available in or nearby vicinity.
What are the advantage and disadvantage of dams?
The buildup of water within the lake ensures that when required and also when water is released for electricity production, the energy can be stored. When used the electricity generated by the dams does not generate greenhouse gases and therefore does not cause pollution.
What is a buttress dam made out of?
Buttress Dam A dam consisting of a watertight part supported at intervals on the downstream side by a series of buttresses. A buttress dam in which the upstream part is a relatively thin flat slab usually made of reinforced concrete. Multiple arch dam.
What is a gravity dam buttress?
Buttresses are just like concrete walls that are built parallel to the flow of water with such a prescribed thickness at frequent intervals. An arch slab or angled deck slab is installed on such buttresses to sustain upstream water. Typically, the Gravity Dam needs more concrete action.
How much space is required between two buttresses in a dam?
The space between buttresses should be in between 15 to 21 meters. However, larger spacing can also be provided by taking some consideration. In this type of buttress dam, no slab or arch is provided at the upstream face, instead of that buttress head is enlarged and joined with adjacent buttress head.
What is a deck slab buttress dam?
The deck slab buttress dams are also known as Ambursen type buttress dams in honour of Nils F Ambursen who in1903 built the first flat slab type of buttress dam. In this type of buttress dam, the sloping membrane or deck consists of a reinforced concrete slab supported by a series of buttresses.
What is a buttress in construction?
A buttress is a thin wall of triangular profile shape. It has a characteristic of sloping upstream face. It is usually spaced at equal interval along the length of the dam and is supported either on a continuous mat foundation or on a separate spread footing.