RFI - P0478-26-001_45_Maple_Street_Cooroy_SWMP

List of Tables and Figures



List of Tables
Table 2-1 Property Details ................................................................................................................................................ 4

Table 3-1: Rational Method Key Inputs............................................................................................................................ 8

Table 3-2: Rational Method Flow Calculations ............................................................................................................... 8

Table 3-3: DRAINS Results for Existing Catchment ....................................................................................................... 9

Table 3-4: Comparison Between DRAINS and the Rational Method ............................................................................. 9

Table 4-1: Comparison of Pre-Development vs. Unmitigated Post-Development Peak Flows ................................ 13

Table 4-2: Detention Tank Parameters ......................................................................................................................... 14

Table 4-3: Mitigated Flow Comparison to Existing....................................................................................................... 15

Table 5-1 Pollutant Reduction Targets .......................................................................................................................... 16




List of Figures
Figure 3-1: Subject Site Location ..................................................................................................................................... 6

Figure 3-2 Max Overland Flow Path (QLD Globe, 2026) ................................................................................................ 7

Figure 3-3: Overland Sheet Flow Times (QUDM, 2016) ................................................................................................. 7

Figure 3-4: DRAINS model for existing catchment ......................................................................................................... 8

Figure 3-5: DRAINS Catchment Inputs ............................................................................................................................ 9

Figure 4-1 Proposed Developed Site .............................................................................................................................. 11




Appendices
Appendix A – DRAINS Results

Appendix B – Rational Method Results

Appendix C – Existing Layout Plan




  45 MAPLE STREET, COOROY
                                                            24 June 2026
  Stormwater Management Plan
  Client Reference: P0478-26-001
  Prepared for Myall Rise PTY LTD