Stormwater Reporting · RAL22/0021

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 The catchment which discharges to the existing pit in the pre-development case is shown in
 Figure 2.




             SITE




Existing gully pit




      Figure 2 – Existing Gully Pit Catchment (sourced from Noosa Council Mapping)

 The following parameters were used to calculated the stormwater discharge from the
 catchment:

 Total catchment discharge to existing pit in Picture Point Crescent pre-development
 parameters:

 Area: 3767m2
 Fraction impervious: 50%
 Average Slope: 8%

 Total catchment discharge to existing pit in Picture Point Crescent post-development
 parameters:

 Area: 4278m2 (includes 511m2 of future roof area)
 Fraction impervious: 55%
 Average Slope: 8%

 Using the above parameters, the stormwater discharge in the pre-development and post-
 development scenarios to Picture Point Crescent were calculated using the rational method as
 shown in Appendix B and summarised in Table 1.