User Manual

U SER ’ S G UIDE — 59
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/diagonal 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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4065UG-E-B 6/9/04 1:49 PM Page 59