Figure: 30 TAC §285.33(d)(3)(E)(i)

A(d) = minimum required distribution absorptive area in square feet

Q = design wastewater usage rate in gallons per day

R(a) = most restrictive application rate between the fill material or the soil surface if

the soil surface is within four inches of the bottom of the distribution media. The

application rate is in gallons per square foot per day.