Actually I hate to insert a simple idea into such deep thinking & calculations....but I will anyways. The simplest way to do any sort of grading is to measure the horizontal distance between two points and the vertical difference between the same points. Now merely divide the vertical difference, in decimals of a foot, meters in our case Tom, by the horizontal distance between them. The resulting answer is the slope expressed as a percentage. IE, two points 100' apart have a horizontal differential of 4', therefore there is a 4% slope, which by the way is the ideal for surface water drainage, agressive enough to handle decent amounts of water, but will limit erosion, etc. The other tip is to convert inches to decimals, multiply the number of inches by 0.0833333 (or 1 divided by 12), so 6" * 0.083333 = 0.50', and of course if you want to be more accurate, you can include the fractions of the inch too, IE 4 3/8" = 4 + (3/8 = 0.375" or 4.375" or 0.3645831875', easy huh........as always, Best of luck.

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