Back-fill on a slope with percent of grade known – Calculated Industries 3088 User Manual
Page 37

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?
2’
3’
3’
A
B
?
?
65%
Grade
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