P0198-25-001_12_Gympie_Street_Tewantin_SWMP

2.3         DRAINS model and comparison to Rational Method
The DRAINS model was configured using the appropriate Australian Rainfall and Runoff (ARR) parameters specific
to the site conditions. Inputs for each catchment were derived from the parameters discussed in previous sections,
ensuring consistency with site-specific hydrology and QUDM rural density development criteria. The general
configuration of the DRAINS model is shown in Table 2-4




Figure 2-4: DRAINS model for existing catchment




The existing catchment was modelled to reflect conditions consistent with rural residential development, as
recommended by QUDM. The relevant DRAINS catchment inputs are detailed in Figure 2-5.




Figure 2-5: DRAINS catchment inputs




 12 GYMPIE STREET, TEWANTIN
 Stormwater Management Plan                                                                                    9
 Client Reference: P0198-25-001                   4 November 2025
 Prepared for Novato Group