Order a truckload of topsoil DIRT. Using a can of spray paint to mark the high and low points can be a helpful visual indicator. How to Measure the Slope of Land Step 1.
Now you have all the raw data you need to calculate your slope percentage.
Repeat this process on all sides of your home and any place the grade changes such as terraces or driveways. Measure a slope or simple grade change in increments. Calculate the slope in degrees by using the following equation. Drive stake B into the ground at the point where the drain will end.