Sizing of the STAs

(N Ci + K Ci - P Cp)

(N Co + K Co - P Cp)

Where: A = effective treatment area

Q = 10-yr average annual flow

Ci = 10-yr average annual inflow phosphorus concentration

Co = 10-yr average annual outflow phosphorus concentration (50 ppb)

K = effective settling rate (10.2 m/yr)

P = 10-yr average annual rainfall (1.233m/yr)

N = 10-yr average annual (rainfall - evapotranspiration) (0.083m/yr)

Cp = 10-yr ave annual atmospheric deposition of phosphorus (50 ppb)

[ 1/(1 + K/N)]

- Q

A =