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U
SER
’
S
G
UIDE
— 53
GRADE/SLOPE
Back-Fill on a Slope —
Percent of Grade Known
You’ve built 55 linear Feet of a 3-foot high retaining wall that is 3 Feet
from the base of a 65% grade. You need to pour back-fill within
12 Inches of the top of the wall (for a 2 Foot depth). How many Cubic
Yards of fill should you have delivered?
KEYSTROKE DISPLAY
1. Find volume for “A”:
o o 0.
5 5 f 55 FEET
x 3 f 3 FEET
x 2 f = µ M+ 330. CU FEET
2. Find run of “B”:
6 5 % p %GRD 65.
2 f r RISE 2 FEET 0 INCH
R RUN 3 FEET 0-15/16 INCH
3. Find volume of triangle “B”:
5 5 f 55 FEET
x ® R RUN 3 FEET 0-15/16 INCH
x 2 f = 338.4615 CU FEET
÷ 2 = µ M+ 169.2308 CU FEET
4. Find total volume:
® ® M+ 499.2308 CU FEET
Ç y 18.49003 CU YD
M
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M
M
M
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