Back-Fill on a Slope with Percent
of Grade Known
You’ve built 55 linear feet of a three-foot high
retaining wall 3 feet out from the base of a 65%
grade. You plan to back-fill to within 12 inches of
the top of the wall (for a 2’ depth). How many
cubic yards of fill should you have delivered?
COMMENTS KEYSTROKES
Step 1 — Find Volume for Section “A”
Clear calculator [On/C] [On/C]
Enter length 55 [Feet]
Multiply by width [x] 3 [Feet]
Multiply by depth [x] 2 [Feet] [=]
Answer: 330 CU FT
Place in Memory [M+]
Step 2— Find Run and Diagonal of Section “B”
Enter grade as Pitch 65 [%] [Pitch]
Enter height (depth) 2 [Feet] [Rise]
Find Run of “B” [Run]
Answer: 3 FT 0-59/64 IN
Find Diagonal of “B” [Diag]
Answer: 3 FT 8-1/32 IN
Step 3— Find Volume of Triangle “B”
Enter length 55 [Feet]
Mult. by width (run) [x] 3 [Feet] 59 [/] 64
(continued on next page)
User’s Guide — 37
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