The purpose of the toe drain is to collect water seepage in the earthen dam and safely convey it to the pond outfall (8†toe drain outlet pipes can be seen on either side of the large rectangular spillway pipes in the photo below). Toe drains perform an important function in maintaining a safe and secure dam.
Diversion dams do not generally impound water in a reservoir; instead, the water is diverted into an artificial water course or canal, which may be used for irrigation or return to the river after passing through hydroelectric generators, flow into a different river or be itself dammed forming an onground or
Hydraulic fill is a means of selectively emplacing soil or other materials using a stream of water. It is also a term used to describe the materials thus emplaced. In the construction of a hydraulic fill dam, the edges of the dam are defined by low embankments or dykes which are built upward as the fill progresses.
The Tarbela Dam takes the cake as the largest earth-filled dam on planet earth. It's also the 5th largest structure in the world by volume. The dam was first constructed to control flooding from the Indus River into the farming villages that sat in the basin.
Dam: a wall built across a river to form a reservoir upstream. Embankment: a built up river or sea wall (at the bank or shore).
Hollow gravity dam. A dam constructed of concrete and/or masonry on the outside but having a hollow interior relying on its weight for stability. Crib dam. A gravity dam built up of boxes, crossed timbers, or gabions filled with earth or rock.
Previously construction and maintenance of river embankments were covered in two Indian Standards, namely IS 11532 : 1985 'Guidelines for construction of river embankments (levees)' and IS 12028 : 1987 'Guidelines for maintenance of river embankments (levees)'.
a dam designed for raising the water level of rivers or for creating a reservoir; it permits the overflow of water during the passage of excess (flash-flood) discharges over the entire length of the dam crest or through drain openings.
A weir is an impermeable barrier that is built across a river to raise the water level on the upstream side. On the other hand, a barrage involves adjustable gates installed over a dam to maintain the water surface at different levels and at different times.
The height of the dam is the vertical distance from the natural streambed at the downstream toe of the dam to the crest. The height of dams with sloping crests shall be determined by a weighted average height above the natural bed of the stream or watercourse, excluding spillways.
Figure: Zoned type embankmentThe outer zone gives stability to the central impervious fill and also distribute the load over a large area of foundations. This type of embankment are widely constructed and the materials of the zones are selected depending upon their availabilities.
Location. The Banasura Sagar Dam is located 21 km from Kalpetta, in Wayanad District of Kerala in the Western Ghats. It is the largest earthen dam in India and the second largest in Asia and a starting point for hikes into the surrounding mountains. It is an important tourist attraction.
EARTHFILL CONSTRUCTION Earthfill construction involves three phases: transportation of concrete from mixer to site, spreading of the concrete in lifts at the site, and compaction of the concrete. These methods allow a very rapid construction time. The concrete used is considered "no slump" concrete.
Zoned type dam : • A zoned embankment dam is composed of more than one kind of material. This is most common type of a rolled fill dam in which a central impervious core is flanked by zones of materials considerably more pervious. • The pervious zones enclose, support and protect the impervious core.
The average lifespan of a dam is often estimated to be 50 years.
Embankment and backfill construction includes the construction of all embankments for canals, drains, roads, river, structures and filling in other parts of works with suitable materials obtained from canals, drains, rivers and structure excavation or extracted from borrow areas.
The first constructed dams were gravity dams, which are straight dam made of masonry (stone brick) or concrete that resists the water load by means of weight. ." Around 2950-2750 B.C, the ancient Egyptians built the first known dam to exist.
Storage dams are constructed to store water during the rainy seasons, supply water to the local wildlife, and store water for hydroelectric power generation, and irrigation. Storage dams are the most common types of dams.
Embankment DamEmbankment dams are made mainly from natural materials. The two main types are earthfill dams and rockfill dams. Earthfill dams are made up mostly from compacted earth, while rockfill dams are made up mainly from dumped and compacted rockfill.
