An excavation is proposed for a square area near the bend of a river as shown in Fig.P6.9. It is expected that the flow of water into the excavation will come through the siltlayer. Pumping tests reveal an average horizontal hydraulic conductivity of 2 x 10 cm/sin the silt layer. The excavation has to be kept dry. Determine the flow rate (q) into theexcavation.12.8 mRiver8 mAverage width 10.4 mExcavationPlanSlo4 mExcavationSiltCross section a-a.Not to scale

Given k=2×10-5,slope=1V:1.2H excavated area (A)=a+b2×y3 where a=8m,b=12.8m,y=depth of excavation

Answered: Ihe excavation has to be kept dry.…

Engineering

Civil Engineering

Ihe excavation has to be kept dry. Determine the flow rate (q) nto the

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter6: Hydraulic Conductivity

Section: Chapter Questions

Problem 6.10P

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Drainage of Pavements

Pavement Drainage holds ample significance, as it prevents the accumulation of water or any liquid on the surface of pavements and ensures proper drainage system. With proper design and gradual slopes provided, the water gets easily removed from the surface into the drains, which are essential during heavy rains and unusual weather conditions keeping it less prone to accidents and increasing the durability of the pavement structure.

Question

An excavation is proposed for a square area near the bend of a river as shown in Fig.
P6.9. It is expected that the flow of water into the excavation will come through the silt
layer. Pumping tests reveal an average horizontal hydraulic conductivity of 2 x 10 cm/s
in the silt layer. The excavation has to be kept dry. Determine the flow rate (q) into the
excavation.
12.8 m
River
8 m
Average width 10.4 m
Excavation
Plan
Slo
4 m
Excavation
Silt
Cross section a-a.
Not to scale

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