Design Specifications for Septic Seepage Pits & Drywells
Design Criteria for seepage pits used to dispose of septic effluent. (i) The required "effective seepage pit area" is obtained from Tables 6 and 7 which are shown below. (ii) No allowance for infiltration area is made for the bottom area of a pit or the surface area of impervious soil layers (percolation rate slower than 60 minutes/inch).