What to do about clay soil drainage? Clay soil is a very heavy soil. Due to the tiny size of the soil particles, it drains slow and it keeps moisture longer. If you have clay soil as your topsoil, you will experience a lot of standing water in your yard. To handle this, you will need a surface drainage system. This will catch the water on top, and get it into a subsurface system of pipes that
. will carry the water away. If you have good topsoil over clay, a subsurface system with perferated pipes and gravel filled trenches will do the job. You can find more information here: www.bachmans.com