MCU14/0106 Appendix E - Engineering Report

Noosa Civic
Erosion Sediment Control Plan




2                 Erosion and Sediment Control
2.1               Erosion Hazard Assessment
The following hazard factors have been considered in preparing the Soil Erosion and Sediment Control
Plans. Whilst it is considered a very low risk, from an erosion hazard perspective, the location and the area
of disturbed ground are significant enough to warrant appropriate drainage, erosion and sediment controls to
mitigate the potential impact that the earthworks on the site may cause.
An analysis of the potential soil loss from the development site is contained within the Sediment Basin Sizing
calculations; refer below, along with a preliminary sizing of a sediment basin to cater for the entire
construction site.

                 Site area                       Sub-catchments                       Remarks
                                          S1
 Total catchment area (ha)               7.749
 Disturbed catchment area (ha)           7.749


 Soil analysis (enter sediment type if known, or laboratory particle size data)
 Sediment Type (C, F or D) if known:      D


 % sand (fraction 0.02 to 2.00 mm)
 % silt (fraction 0.002 to 0.02 mm)
 % clay (fraction finer than 0.002 mm)
 Dispersion percentage
 % of whole soil dispersible
 Soil Texture Group                       D


 Rainfall data
 Design rainfall depth (days)              5
 Design rainfall depth (percentile)       80
 x-day, y-percentile rainfall event      46.3
 Rainfall R-factor (if known)
 IFD: 2-year, 6-hour storm (if known)    15.8


 RUSLE Factors
 Rainfall erosivity (R-factor)           5660
 Soil erodibility (K-factor)             0.05
 Slope length (m)                         80
 Slope gradient (%)                        2
 Length/gradient (LS-factor)             0.41
 Erosion control practice (P-factor)      1.3
 Ground cover (C-factor)                   1




QIC Noosa Civic Pty Ltd                              Version 1                                   November 2014
Appendix C - ESCP.docx                                                                                 Page 2