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Gravity dam ensures that no tension is developed at the upstream face of the dam. The process is that the resultant of these forces should pass within the middle third of the section

A cross drainage work is a structure carrying the discharge from a natural stream across a canal intercepting the stream. … Diverting one stream into another. ? Changing the alignment of the canal so that it crosses below the junction of two streams

Time of Concentration(Tc) is the time in hours taken by rain water that falls at the farthest point to reach the outlet of a catchment

Cleats: These are short sections of wood or steal (angle iron) which is fixed on the principal rafters of trusses to support the purlins.

Breakwaters: The protective barrier constructed to enclose harbours and to keep the harbour waters undisturbed by the effect of heavy and strong seas are called breakwaters.
Dock is an an enclosed area of water in a port for the loading, unloading, and repair of ships.

Optimum moisture content. The water content at which a soil can be compacted to the maximum dry unit weight by a given compactive effort. Also called optimum water content.

A fishplate, splice bar or joint bar is a metal bar that is bolted to the ends of two rails to join them together in a track. The name is derived from fish, a wooden bar with a curved profile used to strengthen a ship’s mast.

The hydrological basic equation describes the hydrological cycle in a quantitative way:
P = R E.
P = Precipitation; from aerosphere retiraled water.

An aquitard is a zone within the Earth that restricts the flow of groundwater from one aquifer to another. A completely impermeable aquitard is called an aquiclude or aquifuge. Aquitards comprise layers of either clay or non-porous rock with low hydraulic conductivity.
Aquifer is a body of permeable rock that can contain or transmit groundwater

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