Dam Design & Construction Types
- Concrete Gravity Dam: Made entirely of concrete, these dams rely on their own weight to resist water pressure; highly stable & durable; more expensive due to the material costs. Eg- Hirakud Dam (Odisha)
- Earthfill (Embankment) Dam: Made primarily of compacted earth materials, these are cost-effective & flexible but require large volumes of material; more susceptible to erosion & suitable for wide valleys. Eg- Indira Sagar Dam (Madhya Pradesh)
- Rockfill Dam: Similar to earthfill dams but use rocks as the main construction material; more resistant to erosion than earthfill dams and offer good stability, but they can be more labor-intensive to construct. Eg- Sardar Sarovar Dam (Gujarat)
- Concrete Rockfill Dam: These dams have a core made of rockfill, providing additional stability. They are typically less costly than full concrete dams but may not be as stable in extreme conditions. Eg- Tehri Dam (Uttarakhand)
- Buttress Dam: This type features a concrete slab supported by multiple buttresses or sloped supports. It is more economical than a gravity dam, especially in narrow valleys, but requires strong foundations. Eg- Koyna Dam (Maharashtra)
- Arch Dam:. Arch dams are curved concrete structures that transfers the water pressure to the canyon walls; ideal for narrow, steep-sided valleys & are only suitable for specific geological conditions. Eg- Idukki Dam (Kerala)
- Hybrid Dam: A combination of two or more dam types, typically combining features of concrete gravity, rockfill, earthfill dams, depending on location & design requirements. They provide a balance between cost & structural integrity. Eg- Bhakra Nangal Dam (Himachal Pradesh-Punjab)
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