Attachment 1 - RECOR RFI Cover Letter Response_20210216

DRAINS Modelling Results - Proposed Site
Project number:     20210216                                                              Calculations:         B. Parry
Street Address:     62 Gateway Drive
Locality:           Noosaville, NSC                                                       Date:                 26/09/2022



Site Pre-Post Comparison Current Conditions (10 min Tc)
A.E.P                 Qy Pre (m3/s)           Qy Post (m3/s)     Qchange (m3/s)           Qchange (%)
           63.2% AEP                   0.042             0.067                    0.025                   60%
               0.5 EY                  0.053             0.084                    0.031                   58%
               0.2 EY                  0.079             0.106                    0.027                   34%
            10% AEP                    0.096             0.123                    0.027                   28%
              5% AEP                   0.114             0.140                    0.026                   23%
              2% AEP                   0.134             0.160                    0.026                   19%
              1% AEP                   0.146             0.175                    0.029                   20%

Site Pre-Post Comparison 2100 Conditions (10 min Tc)
A.E.P                 Qy Pre (m3/s)          Qy Post (m3/s)      Qchange (m3/s)           Qchange (%)
           63.2% AEP                   0.050             0.080                    0.030                   60%
               0.5 EY                  0.069             0.102                    0.033                   48%
               0.2 EY                  0.095             0.128                    0.033                   35%
            10% AEP                    0.118             0.148                    0.030                   25%
              5% AEP                   0.138             0.168                    0.030                   22%
              2% AEP                   0.161             0.192                    0.031                   19%
              1% AEP                   0.176             0.210                    0.034                   19%