How to Calculate a Slope in Landscaping


The process of estimating the slope of a landscape is same to the process of calculating the slope of a graph, a playground slide, or a skate ramp. Determine the rise, which is the vertical distance that separates the highest and lowest points on the slope. Determine the run, which is the distance that lies horizontally between the two ends of the slope. Then take the increase and divide it by the run. Having troubles with erosion is possible if you have a slope that is quite steep. The risk of flooding is increased on land that is level and does not slope. The optimal slope for effective drainage is one that has a rise of one foot for every fifty feet of flow.

  1. Put a stake in the ground at the highest point on the slope you want to calculate, and measure the distance between the stake and the highest point. Set up stakes at regular intervals of eight feet down the line of the slope until you reach the lowest point, which is where the water will drain.

  2. At the bottom of the top stake, where it is level with the ground, tie a string. Pull the thread until it reaches the subsequent stake, then lightly wrap it around the stake. Checking whether or not the string is level requires the use of a level. First, adjust the level by moving the string up or down, and after you’ve got it just right, attach it to the stake. Continue doing so until you have reached the lowest possible point.

  3. Take a measurement of how long the string is. Take a measurement from the ground up to the string that is attached to the lowest stake. Make sure that you are using the same unit for all of your measurements, whether it be feet or inches. In order to accurately compute a run of 50 feet with a climb of 12 inches, you must either use 600 inches and 12 inches or 50 feet and 1 foot; you cannot use a combination of the two.

  4. Take the increase and divide it by the run. A climb of one foot, divided by a run of fifty feet, equals. 02 In order to convert the result to a percentage, move the decimal point to the right by two places. The gradient is 2% in that direction.

    Things You Will Need

    • Stakes

    • String

    • Level

    • Tape measure