Appendix 5.3  Calculation of Elevated SS Concentration (Mitigated) 
Distance from Source (m) Conc. Of SS (mg/L)
50 10.5
62 8.4
80 6.5
92 5.7
100 5.2 sediment loss rate (kg/s)= 0.06
150 3.5
200 2.6 water depth (m) = 7
250 2.1
300 1.7 diffusion velocity (m/s) = 0.01
350 1.5
400 1.3 Assuming 75% removal rate for silt curtain
450 1.2
500 1.0 Dredging rate (m3/hr) = 55
550 1.0
600 0.9 loss rate dredged for grab dredging kg per m3 =
650 0.8 17
700 0.7
750 0.7