The purpose of this study was to determine if there was a significant difference between a six week experimental core stability plank exercise program compared to a traditional supine exercise program in the closure of DRA, and to determine the relationship between DRA measurements, pain, ODI, and PFDI scores.
To meet regulations the average single depth grave is about 3-4 feet deep. Already we see that two out of the three grave depths are deeper than 6 feet (or 1.8 meters). Tripple depth is significantly deeper and double depth is noticeably deeper, being almost 7 feet.
Additionally, the pipes that transport the water to the field must be at an appropriate depth. Typical leach field trenches are from 4 to 6 feet deep. The bottom of the trench is filled with gravel or sand to a height of 2 to 3 feet. The minimum depth for leach field pipes is 6 inches.