Civil-101: Earth and Rock-Fill Dam Design
USACE EM 1110-2-2300 | 3 Professional Development Hours
📋 Final Assessment
Pass 21 out of 30 questions (70% minimum)
1.
According to USACE standards, what fines content is required for Zone 1A impervious core material?
a) Less than 12% fines
b) Greater than 30% fines
c) Zero percent fines
2.
What is the recommended downstream slope for static conditions on earthfill dams per USACE EM 1110-2-2300?
a) 1V:2.5H
b) 1V:2.0H
c) 1V:1.5H
3.
What is the minimum width requirement for chimney drains in embankment dams?
a) 3 feet
b) 6 feet
c) 12 feet
4.
What is the minimum factor of safety required for static slope stability analysis?
a) 1.3
b) 1.5
c) 1.2
5.
What minimum relative compaction is required for impervious core zones?
a) 90% of Maximum Dry Density
b) 95% of Maximum Dry Density
c) 85% of Maximum Dry Density
6.
What is the maximum lift thickness allowed for Zone 1A impervious core material?
a) 6 inches
b) 9 inches
c) 12 inches
7.
What is the maximum allowable exit gradient to prevent piping failure through foundation materials?
a) 0.5
b) 0.7
c) 1.0
8.
For a 75-foot high earth dam, what is the minimum crest width required?
a) 10 feet
b) 22.5 feet
c) 20 feet
9.
What is the leading cause of embankment dam failures worldwide?
a) Earthquake
b) Overtopping
c) Piping
10.
What is the maximum allowable fines content for shell zone material in zoned earth dams?
a) Greater than 30%
b) Less than 12%
c) 20-30%
11.
What material is typically used for toe drains in embankment dam drainage systems?
a) Clay
b) Perforated PVC pipe
c) Riprap
12.
The Bishop simplified method of slices for slope stability analysis uses what stress analysis approach?
a) Total stress analysis
b) Effective stress analysis
c) Pore pressure analysis only
13.
What is the recommended frequency of density tests during embankment construction?
a) 1 test per 1,000 cubic yards
b) 1 test per 5,000 cubic yards
c) 1 test per 10,000 cubic yards
14.
What is the recommended upstream slope for earthquake loading conditions?
a) 1V:2.5H
b) 1V:2.0H
c) 1V:3.0H
15.
What is the minimum thickness required for filter zones surrounding drainage features?
a) 6 inches
b) 12 inches
c) 36 inches
16.
What is the allowable moisture content variation during compaction of impervious core material?
a) ±1% of optimum
b) ±2% of optimum
c) ±3% of optimum
17.
What percentage of embankment dam failures are attributed to piping and internal erosion?
a) 23%
b) 34%
c) 31%
18.
What percentage of embankment dam failures result from foundation defects?
a) 23%
b) 31%
c) 34%
19.
What is the recommended minimum thickness for blanket drains downstream of embankment dams?
a) 2 feet
b) 3 feet
c) 5 feet
20.
What is the minimum factor of safety required for rapid drawdown slope stability conditions?
a) 1.5
b) 1.2
c) 1.0
21.
What is the typical size range for riprap used on embankment dam slopes?
a) 3-6 inches
b) 6-24 inches
c) 24-36 inches
22.
How often should nuclear density gauges be checked for calibration during embankment construction?
a) Weekly
b) Daily
c) Monthly
23.
What is the primary function of Zone 2 material in a zoned embankment dam?
a) Water barrier
b) Transition zone
c) Erosion control
24.
What percentage of dams worldwide are embankment type dams?
a) 65%
b) 85%
c) 95%
25.
What is the maximum allowable D15/D85 filter criteria ratio for drain filters?
a) Less than 5
b) Less than 25
c) Less than 50
26.
What is the minimum plasticity index required for impervious core materials?
a) Greater than 12
b) Less than 12
c) Exactly 12
27.
What is the recommended maximum spacing for seepage weirs in embankment dam drainage systems?
a) 200 feet
b) 500 feet
c) 1000 feet
28.
Which ASTM standard is used for laboratory compaction testing of embankment materials?
a) ASTM D698
b) ASTM D1557
c) ASTM D698M
29.
What was the primary cause of failure for Teton Dam in 1976?
a) Earthquake
b) Piping
c) Overtopping
30.
What is the typical minimum freeboard allowance for earth embankment dams?
a) 3 feet minimum
b) Height/3
c) Height/4
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Civil-101: Earth and Rock-Fill Dam Design
3 Professional Development Hours (PDH)
Course ID: CIV-101 | Provider: USACE EM 1110-2-2300
Date Completed:
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