For sliders shorter than 48 inches, if the distance between the end of the slide and the water, known as the drop, is 3 inches or less, the water depth should be 2 feet. For sliders taller than 48 inches, the pool must be at least 3-feet deep, with some manufacturers requiring 3 1/2 to 4 feet as a minimum.
Other Factors Determining Depth
The speed you're likely to reach on a slide and the height of the slide also influence how deep the landing pool should be. The distance of the drop also plays a role. If your slide has a drop greater than 6 inches and does not decelerate the slider before discharge, the depth of the pool should be the same as is required for a one-meter diving board, or 11 1/2 feet, according to Safe Wise. If the manufacturer specifies otherwise, follow those recommendations. For slides that have a 10 percent or less grade, snake around and slow the speed of the slider at the drop zone, a 3 to 4 foot landing pool is adequate.