Page 10 - Water Pollution Management - Management Plans - Understanding your Risk
P. 10

Step 4  Determine the mean annual peak flow







                                  Peak Flow Litres/Second/Hectare






                                    Soil Type                                                 Annual Rainfall (mm)


                                                    <600               600 - 800         800 -1200          1200 - 1600       1600 - 3200        >3200




                                  1                 0.3                0.4               0.6                0.9               1.7                2.4




                                  2                 1.4                1.8               2.8                4.1               7.7                10.8





                                  3                 2.6                3.4               5.2                7.7               14.4               20.1




                                  4                 3.3                4.4               6.7                9.9               18.6               26.0




                                  5                 4.2                5.5               8.4                12.4              23.3               32.7







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