P0198-25-001_12_Gympie_Street_Tewantin_SWMP

        assessment of catchment behaviour. Therefore, DRAINS model results have been adopted for final
        design.

   •    Minor discrepancies, particularly for higher AEP events (20-year and above), indicate that the Rational
        Method provides a reasonable approximation for design verification.

   •    The largest discrepancies are typically observed in low-frequency events (1 to 5 year), where DRAINS
        captures additional hydrological complexities such as temporal rainfall variation and surface storage,
        which are not represented in the Rational Method.




12 GYMPIE STREET, TEWANTIN
Stormwater Management Plan                                                                                    11
Client Reference: P0198-25-001         4 November 2025
Prepared for Novato Group