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The foundations of bridges on erodible beds are...

The foundations of bridges on erodible beds are taken down below the HFL by an amount equal to _____________

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asked Sep 25, 2023 in Irrigation Engineering by Carter (75.2k points)

The foundations of bridges on erodible beds are taken down below the HFL by an amount equal to _____________

(a) 4/3 times the maximum scour depth

(b) 2/3 times the maximum scour depth

(c) 1.5 times the maximum scour depth

(d) 2 times the maximum scour depth

This question was addressed to me in homework.

The above asked question is from Small Road Bridges Construction topic in section Culverts and Small Road Bridges Construction of Irrigation Engineering

irrigation engineering
culverts and small road bridges construction
small road bridges construction

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1 Answer

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answered Nov 9, 2023 by Greg (106k points)

Correct option is (a) 4/3 times the maximum scour depth

Explanation: The value is taken down below HFL by 4/3 times the maximum scour depth or Max scour depth + 2 (for arched bridges) and Max scour depth + 1.2 for other bridges (whichever is more). The formula is applicable where there is no bed floor is provided under the structure.

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