1. (a) The effective effluent disposal area for dry wells shall be at least 50% of the area established in Env-Wq 1016.02.

2. (b) The area shall be calculated at the edge of stone around the perimeter of the dry well using one of the following formulas:

   1. (1) A = πdhN for round or hexagonal dry wells; or
   2. (2) A = 2h(l+w)N for rectangular dry wells.

3. (c) For the purposes of the formulas in (b)(1) and (2):

   1. (1) h = the effective height which is the vertical wall height below the inlet pipe, plus a maximum of 12 inches of septic stone placed below the dry well. The maximum effective height shall be 6 feet;
   2. (2) d = the diameter of the dry well plus the additional width of the stone;
   3. (3) l = the length of the dry well plus the additional width of stone;
   4. (4) w = the width of the dry well plus the additional width of stone; and
   5. (5) N = the total number of drywells.
4. (d) The bed bottom shall be the bottom of the 12 inches of septic stone under all dry wells.

Source. (See Revision Notes #1 and #2 at chapter heading for Env-Wq 1000) #11184, eff 10-1-16; ss by #14486, eff 2-1-26, EXPIRES: 2-1-36