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A road bridge is proposed to be constructed across an alluvial stream with the estimated design discharge as 2500 m3/s. It is decided to adopt a total effective waterway equal to 300 m for this bridge as against the regime width of 237.5 m due to afflux considerations. If the HFL at the site is at RL 214 m, then the RL of the open foundation can be suggested as _______

A road bridge is proposed to be constructed across an alluvial stream with the estimated design discharge as 2500 m3/s. It is decided to adopt a total effective waterway equal to 300 m for this bridge as against the regime width of 237.5 m due to afflux considerations. If the HFL at the site is at RL 214 m, then the RL of the open foundation can be suggested as _______ Correct Answer 206.6 m

Using Lacey’s regime formula for alluvial stream – R = 1.35 (q2/f)1/3 = 1.35 (2500/300)1/3 = 5.55 m The foundation may be taken down below HFL by 1.33R or R + 1.2 m (whichever is more). i. 1.33R = 7.38 m ii. R + 1.2 = 6.75 m (<7.38 m) Hence, foundation level = 214 – 7.38 = 206.6 m.

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