Attachment D - Stormwater Management Plan · 132008.175.04

              of the stone pitching will also provide an “energy dissipation”
              effect.

              The following calculations demonstrate adequacy for lot 9: -

              Running the RIP spreadsheet for 100year ARI storm of 5-minute
              duration we note the following (refer Appendix D)

              Qi (max)      =       355 L/s at 5-minutes.

              We also note that this corresponds with an available head of
              3.2m (weir height above base of RIP’s) and an infiltration rate
              through the RIP’s of: -

              Maximum discharge outflow Qo (2.77m) = 245 L/s

              Hence emergency overflow via the weir will not engage for
              events <Q100 and will be contained within the designated RIP
              system.




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A6107/L9/SMP/RevA/Aug 2021                                                   Page 6 of 7
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