Have one assistant hold the string on the ground at the top of the driveway. Slope Length is the square root of Rise squared plus Run squared Angle of Inclination is the tangent of Rise devided by Run Percentage is 100 multiplied by Rise devided by Run. Viewing a house tomorrow we took a drive past it earlier for a nosey and the driveway is short and also on quite a steep slope downwards towards the house.
Walk down the driveway from end to end with a measuring wheel to determine its length.
To find the percentage multiply this decimal by 100 like this. Driveways should have a slight slope to allow water to drain away from the surface. The slope grade of the driveway in a percent value. Driveways should have a slight slope to allow water to drain away from the surface.