Sample Design Calculations Page 32
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37C
APPENDIX
SAMPLE DESIGN CALCULATIONS
EXAMPLE C7. NET BUOYANCY FORCE ON A LIQUID PROPANE TANK (concluded)
NOTE: To resist this buoyant force, a slab of concrete with a volume, V
, is usually strapped to the tank to
c
resist the buoyant load.
Floodwalls and Levees
EXAMPLE C8. FLOODWALL DESIGN
Given:
Site soil conditions based on clean dense sand:
•
(unit weight of soil) = 120 lbs/ft
3
soil
• S
(allowable soil bearing capacity) = 2,000 lbs/ft
2
a
• S (equivalent fluid pressure of soil) = 78 lbs/ft
3
• C
(coefficient of friction) = 0.47
f
• k
(passive soil pressure coefficient) = 3.69
p
• C
(cohesion) = 0
s
Local flood conditions:
• Fresh water (
= 62.4 lbs/ft
3
)
w
• Area of potential normal impact loading, C
= 0.2 (moderate upstream blocking), C
= 0.8
B
Str
• Expected flood velocity, V (ft/sec)
Dimensional information
• H = 7.0 ft
• D
= 4.0 ft
t
• D = D
= 5.0 ft
h
• t
= 1.0 ft
ftg
• B = 5.0 ft
• A
= 2.5 ft
h
C-32
ENGINEERING PRINCIPLES AND PRACTICES for Retrofitting Flood-Prone Residential Structures
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