After heavy rains, many of the club's old bunkers have washouts. Sand erosion is caused by poor perimeter grading on the outside of the bunker, internal drainage and severity of slope issues. As the sand fines it's way to the bottom of the bunker, the underlying topsoil now starts to erode and mixes with sand causing the contamination. When sand and soil are mixed together the bunker sand becomes hard making it difficult to play a sand shot.