Why Bunker Drainage FailsBunker drainage failure is attributed to the use of gravel or stone under the sand. Because sand has no structure, the finer particles move downward with each rain event. These particles clog up the spaces (voids) in the stone or gravel bed, continuing to do so with each rain event until, eventually, water flow to the drainpipe is blocked off. This causes the bunkers to flood and allows the native soils to migrate upward. This contaminates the sand, and the cycle continues. It requires lots of maintenance. Using our system for bunker drainage solves these issues once and for all. our systems eliminates all stone in the bunkers and eliminates the possibility of clogging. It is not experimental. We have systems in place now for over 15 years without a single drainage failure.