Grading By Hand Equation
Grading By Hand Equation
(OP)
I had someone show me a matrix system to grade a site by hand. It involved taking the four corners of each box averaging them and then adding them all together. A positive meant you had export and a negative meant you had import. Let's assume we had 20'x20' grid boxes and the four corners are 2, 4, 6, 8. The average of those numbers is 5. Once you have that I can't remember the formula. It was something like 5(20*20). Then you do the next box and add it to the first and so on.





RE: Grading By Hand Equation
RE: Grading By Hand Equation
Vc = L^2 x (Hc)^2 / 108 x (Hc + Hf)
Vf = L^2 x (Hf)^2 / 108 x (Hc + Hf)
Where:
Vc = Vol Cut (CY)
Vf = Vol Fill (CY)
Hc = Sum of cuts on all four corners of grid
Hf = Sum of fills on all four corners of grid
L = Length of side of grid (feet)
108 CY = factor to convert to CY
This will result in Cut & Fill for each grid.
Example:
C = 1 F = 2
---------------
| |
| |
| |
| |
---------------
C = 2 F = 3
Hc = 3, Hf = 5