(i) A weir across an alluvial river has a horizontal floor of length 80 m and retains 8 m of water under full pond condition. If the downstream sheet pile is driven to a depth 8 m below the average bed level, then calculate the exit gradient. Also assuming a porosity of 25% and the relative density of soil particles as 2.70, determine the critical exit gradient and the factor of safety of the system with respect to the exit gradient.

(i) A weir across an alluvial river has a horizontal floor of length 80 m and retains 8 m of water under full pond condition. If the downstream sheet pile is driven to a depth 8 m below the average bed level, then calculate the exit gradient. Also assuming a porosity of 25% and the relative density of soil particles as 2.70, determine the critical exit gradient and the factor of safety of the system with respect to the exit gradient.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.

Question

(i) A weir across an alluvial river has a horizontal floor of length 80 m and retains 8 m of
water under full pond condition. If the downstream sheet pile is driven to a depth
8 m below the average bed level, then calculate the exit gradient. Also assuming a
porosity of 25% and the relative density of soil particles as 2.70, determine the critical
exit gradient and the factor of safety of the system with respect to the exit gradient.

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