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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
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
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
M
M
M
M
M
M
M