Table 4.

Summary of bulk dilution and loading calculations applied to the study area

ParameterEffluent phosphate concentration
10 mg P l−120 mg P l−130 mg P l−1
Groundwater recharge and interflow (m3 d−1)840084008400
Total septic tank flows (m3 d−1)12.212.212.2
Loading (kg a−1)44.789.4134.1
Dilution factor689689689
Phosphate concentration after dilution (mg P l−1)0.0140.0290.044