transitive. 1  To reverse the winding or twisting of: unwind a ball of yarn. 2  To separate the tangled parts of; disentangle. 3  To free (someone) of nervous tension or pent-up energy.
A leach field is an important part of a septic system. It disperses fluid from the septic system over a large area of soil adjacent to the building it services.he distribution box has another pipe that leads to the leach field. From this pipe, you will dig the trenches. Decide where to dig your trenches. You will need to dig three trenches, each about 12 inches wide and 20 feet long.
1 Septic drainfield trench spacing: The trenches are dug about 6 feet apart on center (center of pipe to center of next pipe) which allows, in good design, space for a set of replacement trenches to be placed between the original ones when the first set fails. Septic drainfield gravel specification: typically, washed gravel, 3/4 to 2 1/2 (pretty big) gravel is placed for a depth of 12 under the drain line piping (septic drain tile in some references).