A good starting point is 150 to 350 mm above the surface of the mulch cover. However, consideration should be given to public safety, whether or not an underdrain is included, and the time required for ponded water to drain through the filter bed surface (must drain within 48 hours). | A good starting point is 150 to 350 mm above the surface of the mulch cover. However, consideration should be given to public safety, whether or not an underdrain is included, and the time required for ponded water to drain through the filter bed surface (must drain within 48 hours). |