7.10 Figure 7.32 shows the cross section of a levee which is 650 m long and is underlain by a 2.5-m-thick permeable sand layer. It was observed that the quantity of water flowing through the sand layer into the collection ditch is 13.5 m³/hr. What is the hydraulic conductivity of the sand layer? Elv. 175 m Elv. 158 m 2.5 m Ditch 210 m Impervious Sand

7.10 Figure 7.32 shows the cross section of a levee which is 650 m long and is underlain by a 2.5-m-thick permeable sand layer. It was observed that the quantity of water flowing through the sand layer into the collection ditch is 13.5 m³/hr. What is the hydraulic conductivity of the sand layer? Elv. 175 m Elv. 158 m 2.5 m Ditch 210 m Impervious Sand

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

Field applications of hydraulic conductivity

Hydraulic conductivity is one of the hydraulic properties of soil defined as a measurement of the ability of a porous medium to permit water movement or fluid flow through it. It is denoted by the letter K. It is influenced by the density and viscosity of the fluid. It is also called permeability. Hydraulic conductivity is defined as the ratio of velocity to the hydraulic gradient. The different methods used to determine the hydraulic conductivity are laboratory methods (constant head permeability tests and falling head tests), in-situ field methods (pumping in and pumping out tests), small scale field tests (infiltration tests and slug tests), and indirect methods such as estimation from grain size, consolidation test data, and horizontal capillary test. The pedotransfer function (PTF) method is a specific empirical estimating approach employed in the soil sciences is also used to determine the hydraulic conductivity of the soil.

Question

7.10 Figure 7.32 shows the cross section of a levee which is 650 m long and is
underlain by a 2.5-m-thick permeable sand layer. It was observed that the
quantity of water flowing through the sand layer into the collection ditch is
13.5 m³/hr. What is the hydraulic conductivity of the sand layer?
Elv. 175 m
Elv. 158 m.
2.5 m
Ditch
210 m
Impervious
Figure 7.32
Sand

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Answer in three decimal places please
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the cross section of a levee, shown below, which is 650 m long and is underlain by a 2.5-m-thick permeable sand layer. It was observed that the quantity of water flowing through the sand layer into the collection ditch is 13.5 m3 /hr. What is the hydraulic conductivity of the sand layer?
A dam shown in Figure 1 retains 10 m of water. A sheet pile wall (cutoff curtain) on the upstream side, which is used to reduce seepage under the dam, penetrates 7 m into a 20.3 m-thick silty sand stratum. Below the silty sand, there is a thick deposit of practically impervious clay. The average hydraulic conductivity of the silty sand is 2x10 cm/s. Assume that the silty sand is homogeneous and isotropic. a) Draw the flow net under the dam. b) Calculate the flow rate, q. c) Determine the hydraulic gradient at exit path ED. 10 m A 20.3 m 2.4 mt C 7m 30.6 m- -Sheet pile wall Clay (impervious) Figure No. 1 E k = 2 x 104 cm/s H
Question 3 A certain 20 m thick sandy confined aquifer has a permeability of 2.4 x 102 cm/s and a void ratio of 0.91. Groundwater is flowing through this aquifer with a hydraulic gradient of 0.0065. Determine the time (in hours) required for water to travel 0.5 km through this aquifer.