19553 - Erosion and Sediment Control Plan

RUSLE CALCULATION SPREADSHEET



Note: These "Detailed Calculation" spreadsheets relate only to high erosion hazard lands as identified in table F1 or where the designer chooses to use
the RUSLE to size sediment basins. The "Standard Calculation" spreadsheets should be used on low erosion hazard lands as identifiedin Table F1 and
where the designer chooses not to run the RUSLE in calculations.

1. Site Data Sheet

                                           Site Name: Parc Cooroy

                                         Site Location: Lake Macdonald Drive Lake Macdonald

                                             Precinct: Area 1 - Road 1 Ch 0.0-246

                                   Description of Site: Subdivision


                                                                                   Sub-catchments
                            Site area                                                                                                   Remarks
                                                          1A          1B
  Disturbed catchment area (ha)                          0.24     0.24


Soil analysis (enter sediment type if known, or laboratory particle size data)
  Soil Texture Group                                      D            D             0        0      0         0


Rainfall data
                                                                                                                       85%ile 5 day event for Nambour from Table
  x-day, y-percentile rainfall event                     56.2         56.2
                                                                                                                       B5
  IFD: 2-year, 6-hour storm (if known)                   14.9         14.9


RUSLE Factors
  Rainfall erosivity (R -factor)                         4930     4930                        0      0        0        Auto-filled from above
  Soil erodibility (K -factor)                           0.047    0.047                                                Table E5
  Slope length (m)                                        119         127
  Slope gradient (%)                                      4.7         9.7
  Length/gradient (LS -factor)                           1.36         3.50                   0.00   0.00     0.00      From Table E3.3
  Erosion control practice (P -factor)                    1.3         1.3
  Ground cover (C -factor)                                1            1


Calculations
  Soil loss (t/ha/yr)                                     410     1054              0         0      0        0        RUSLE - refer section E3
  Soil Loss Class                                         D            D            D         0      0        0
  Soil loss (m3/ha/yr)                                    315         811           0         0      0        0
  Volumetric runoff coefficient                          0.72         0.72                                             Refer Table B7
  Settling Zone Storage (m3)                              97          97            0                                  Section B - step 5b
  Sediment basin storage volume, m3                       13          32            0         0      0        0        2 months runoff volume
  TOTAL SUBCATCHMENT BASIN VOLUME                         110         129           0         0      0        0
  TOTAL BASIN VOLUME                                                  239


Basin Dimensions
Depth (nominal)                                                              1.5
Length to width ratio                                                        2.5
Width                                                                          8
Length                                                                       20