MCU14/0106 Appendix E - Engineering Report

Noosa Civic
Erosion Sediment Control Plan




 Calculations
 Soil loss (t/ha/yr)                                  150                                                     RUSLE equation
 Soil Loss Class                                      1                                                 See Ch 4 Table 4.2 pge 54
 Soil loss (m3/ha/yr)                                 115
 Sediment basin storage volume, m3                    152                                              See Chapter 6 (2 months soil
                                                                                                                 loss)
           x             2 months soil loss calculated by RUSLE




 .                                                                                 Average Depth of basin =     1.8        metres

  Site         Cv         Rx-         Total      Settling   Sediment     Total                      Basin shape
                         day, y-   catchment      zone       storage     basin
                          %ile        area       volume      volume     volume
                                      (ha)        (m3)         (m3)       (m3)              L:W                 Length      Width
                                                                                            Ratio                (m)         (m)



     S1     0.30         46.3        7.749        1076        152        1228                 3                   45.2         15.1


The Soil Loss class for the site is Very Low (150 t/ha/yr). refer Table 2-1 below.
Table 2-1           Soil Loss Class

     Soil Loss Class                Calculated Soil Loss        Erosion Hazard
                                          (t/ha/yr)
               1                          0 to 150                    Very Low
               2                         151 to 225                     Low
               3                         226 to 350                 Low-Moderate
               4                         351 to 500                   Moderate
               5                         501 to 750                     High
               6                        751 to 1,500                 Very High
               7                             >1,500              Extremely High


The above table is taken directly from Table 3.1 Soil Loss Classes, Chapter 3 of the IECA Best Practice
Erosion and Sediment Control 2008.

2.2                 Site Slope
The topography of the site is very gently falling to the north and south west. With the formation of the area
into the proposed commercial development, temporary overland flow paths will be established to direct dirty
water flows to the established sediment basin/s. Grades within the works area will generally be 1.0 to 3.0%.
All slopes are to be maintained to lengths well less than 40m to minimise velocity generation by stormwater
runoff and the potential to pick up and move soil across the site.




QIC Noosa Civic Pty Ltd                                         Version 1                                             November 2014
Appendix C - ESCP.docx                                                                                                      Page 3