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A water supply with a BOD level of 3-5 ppm is considered moderately clean. In water with a BOD level of 6-9 ppm, the water is considered somewhat polluted because there is usually organic matter present.

The roads are constructed with a rise at the outer edge termed as super elevation. Super elevation reduces the risk of accidents on turning the curves greater than the designed speed.

The bottom most layer where the loads on the pavement is transferred to the soil is termed the subgrade.

The load to be carried by the pavement determines the depth of pavement where as the the tyre pressure determine the quality of pavement.

Tie bars are usually placed in longitudnal joints or between an edge joint and a curb or shoulder.

Pitot tube also known as pitot probe.
It is used to measure the velocity in a flowing stream.
For example speed of an aircraft.

The depth at which the specific energy is minimum is termed as critical depth, provided the discharge remains a constant.

A hydrograph plots discharge over Y axis and time over X axis at a particular point of a river.

A channel section is most efficient when it passes a maximum discharge for given cross section area, resistance coefficient, and bottom slope. Hence, semi circular cross section is most effective. But due to the difficulty in construction a trapezoidal one is chosen.

Self weight of a gravity dam is main stabilizing force which counter balances all the external forces acting on it.
It act as a resisting moment against the overturning moment caused due to the lateral force imparted by water.
The self weight of a gravity dam is also known as resisting force, stabilising force and internal force.
Water peessure is the major overturning pressure of a gravity dam.

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