Sample Design Calculations Page 34
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37C
APPENDIX
SAMPLE DESIGN CALCULATIONS
EXAMPLE C8. FLOODWALL DESIGN (continued)
Since F
acts only at a single point, we will not include loading into the uniform lateral floodwall
n
loading. Once the floodwall is sized, we will evaluate the wall perpendicular to flow to determine
ability to resist the impact loading. If necessary this wall will be redesigned to resist impact loads. This
process will avoid overdesigning of the entire floodwall.
Equation 5F-12:
=
Determine Vertical Forces:
Equation 5F-1:
=
1
γ
=
=
Equation 5F-1: f
D
tB( . 0 5)(62. ) 4 4 ( )( ) 5 624 lbs/ lf
w
buoy2
2
= 1,092 +
=
624 1,716 lbs / lf
Equation 5F-1:
Equation 5F-2:
=
Equation 5F-3:
=
Equation 5F-4:
=
Equation 5F-5:
=
Equation 5F-6:
=
Equation 5F-7:
=
Equation 5F-8:
=
Step 4: Check sliding.
Equation 5F-10:
=
Equation 5F-11:
=
Equation 5F-13:
=
Equation 5F-14:
=
= 1.6 > 1.5 (recommended) OK for sliding
Step 5: Check overturning.
C-34
ENGINEERING PRINCIPLES AND PRACTICES for Retrofitting Flood-Prone Residential Structures
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