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In designing of access ramps for drainage channels, why should the direction of access ramps be sloping down towards downstream?

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In the design of access ramps, the direction is normally specified to be sloping down towards downstream so as to avoid the occurrence of over-shooting of flowing water for supercritical flow in case of aligning the ramps in the reverse direction of channel flow.

Note: Access ramps refer to ramps used for maintenance vehicles during routine maintenance of channels.

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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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