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RFI - Attachment F - Engineering Report
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Removal Load Curves
Allison (CRC 1998) examined gross pollutant loads on a catchment wide base for
numerous storm events. From this work he derived the following (Figure 13) loading
curve for gross pollutants. This grading curve has become the basis for estimating gross
pollutants in the Music Model
Using the average results for gross pollutant loads on a monthly basis, a very similar
curve is derived for gross pollutants for the Ku-Ring-Gai Catchment; however loads are
approximately 40% less than those determined by the CRC. This suggests that the
Blackbutt Creek catchment has a low gross pollutant loading.
Figure 13: Gross Pollutant Loading Curve (CRC 1998)
Gross Pollutant Load Vs Monthly Rainfall
14
y = 2.3344Ln(x) - 3.3671
Goss Pollutant Load
12
R2 = 0.779
10
(Kg/hec)
8
6
4
2
0
0 50 100 150 200 250 300 350 400
Monthly Rainfall (mm)
Figure 14: Gross Pollutant Loading Curve for Blackbutt Creek Catchment
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