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CEG 3011 Spring 2010
Soil Mechanics
Homework 7 Due Friday March 26
th
2010
Problem 1
Water is being pumped from the sand aquifer situated below a lake as shown below.
A
pressure transducer was installed at the interface of the sand layer aquifer and the slit
layer.
The pressure transducer measured a porewater pressure of 312 PSF.
•
Which direction is the flow moving. (is the lake feeding the aquifer or vise versa)
EXPLAIN.
Hint: find the total head on both sides of the silt layer and
compare them
•
Find the porewater pressure at B
Sand Aquifer
Silt
Lake
12 ft
10 ft
Pressure Transducer
4 ft
B
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Problem 2
Use the flow net below to solve answer the following;
•
How many flow paths are there in the flow net
•
How many drops are there.
•
How much head loss occurs per drop
•
Find the pressure head at point A (5 feet from the surface on the downstream)
•
Find the porewater pressure at point B (7.5 feet from the surface on the down
stream )
5 m
7.5 m
5 m
3
Problem 3
A dam for a reservoir is shown below.
(a) If the dam is 150 m long (perpendicular to the plane of the paper), how much water is
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This note was uploaded on 10/29/2011 for the course CEG 3011 taught by Professor Staff during the Spring '07 term at FSU.
 Spring '07
 staff

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