What Is a 1% Grade?

1% grade = 0.57 degrees = 1 cm per 100 cm = 1 inch per 100 inches = 0.125 inch per foot.

What is a 1% slope?

1% as a decimal is 0.01 and hence the slope is 0.01. That means for a run of pipe of a certain length the rise must be 0.01 times the length. Thus for you example, since the length of the run is 80 feet which is 80 × 12 = 960 inches the rise must be 0.01 × 960 = 9.6 inches.

How much is 2% of a grade?

Assume the length between the stakes is 6 feet and you want a 2% grade. 1/4" x 6 = 1.5 inches. This means you want to toe to be 1.5 inches below the hinge. The difference between the desired grade (1.5") and the current grade (0.5") is how much you must cut from the toe stake.