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Q. Explain about Best hydraulic section?
The best hydraulic section of an open channel is considered by provision of maximum discharge with a given cross sectional area. Channels with circular shape is the best hydraulic sections whereas a rectangular channel with channel width being equal to two times the height of channel is the best hydraulic section amongst all rectangular sections. Actually the choice of best hydraulic section also possesses other benefits than hydraulic performance. For example for a given discharge rate use of best hydraulic section could assure the least cross sectional area of the channels. Considerable savings could be made from the reduction in the amount of excavation and from the useof less channel linings.
How can we reduced frictional losses Frictional losses can be reduced by several methods, such as : (a) Over-tensioning the tendons by an amount equal to the maximum frictio
Advantages of unbonded post-tensioning systems Similarly, some advantages of unbonded post-tensioning systems over bonded post-tensioning ones may be written as under : (a)
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