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Principles Of Geotechnical Engineering, Si Edition
9th Edition
ISBN: 9781305970953
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 7, Problem 7.21P
To determine
Find the ratio of equivalent permeability
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Existing Filter Design Parameters at 22.5 MGD:
A) # of Filters: 5
B) #Bays per Filter: 1
C) Bay Surface Dimensions (L X W X D): (40.5 ft. X 13 ft. X 11.5 ft.)
D) Surface Area per Filter: 526.5 ft^2
E) Total Filtration Area: 2,633 ft^2
F) Hydraulic Loading Rate: 6 gpm/sf (w/ all filters in service)
G) Filtration Capacity at HLR: 22.7 MGD
H) Filter Media:
1) Anthracite: 20 in. depth, 1.00 mm Effective Size
2) Sand: 9 in. depth, 0.50 mm Effective Size
1) L/d Ratio (depth of media/effective size): 965
J) Backwash Pumps: 15 MGD (two pumps)
K) Backwash water for the filters is provided from the high service pump
station through a 24-inch backwash water
L) Air Wash Blowers:
1) Number: 2 Hoffman Centrifugal Model 38406A, 125 hp
2) Capacity: 3,100 scfm (standard cubic ft/^2)
3) Air Scour Rate: 5.90 scfm/ft^2
Deliverables:
1) Determine if the existing filtration system is sufficient to accommodate the
projected future capacity.
A) Current Capacity: 22.5 MGD
B) Future Capacity: 34.5 MGD for…
Part 1: True or False. Indicate whether the following statements are True (T) or False (F) by encircling
the letter that corresponds to your answer.
1. (T/F) Residual soils are formed by the weathering of rocks in place.
2. (T/F) The Standard Penetration Test (SPT) provides a disturbed soil sample.
3. (T/F) The groundwater table has no effect on the interpretation of soil exploration data.
4. (T/F) Geophysical methods are always more accurate than direct soil sampling methods.
5. (T/F) The N-value in the SPT is the number of blows required to drive the sampler the first 150
mm.
Part 2: Multiple choice. Choose the best answer for each question.
1. Which of the following is NOT a transported soil deposit?
a) Alluvial
b) Glacial
c) Residual
d) Aeolian
2. What is the primary purpose of subsurface exploration?
a) To determine the depth of bedrock
b) To identify soil types and their properties
3. Which test provides a continuous profile of soil
a) Standard Penetration Test (SPT)
b) Cone…
Determin the shear and moment in teh beam as a function of x where 2m<x<4m.
Chapter 7 Solutions
Principles Of Geotechnical Engineering, Si Edition
Ch. 7 - Prob. 7.1PCh. 7 - Prob. 7.2PCh. 7 - Prob. 7.3PCh. 7 - Prob. 7.4PCh. 7 - Prob. 7.5PCh. 7 - Prob. 7.6PCh. 7 - Prob. 7.7PCh. 7 - Prob. 7.8PCh. 7 - Prob. 7.9PCh. 7 - Prob. 7.10P
Ch. 7 - Prob. 7.11PCh. 7 - Prob. 7.12PCh. 7 - Prob. 7.13PCh. 7 - Prob. 7.14PCh. 7 - Prob. 7.15PCh. 7 - Prob. 7.16PCh. 7 - Prob. 7.17PCh. 7 - Prob. 7.18PCh. 7 - Prob. 7.19PCh. 7 - Prob. 7.20PCh. 7 - Prob. 7.21PCh. 7 - Refer to Figure 7.24. The following data were...Ch. 7 - Prob. 7.23PCh. 7 - Prob. 7.1CTP
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