The Flood Model User Guideline for Mullet Creek has been developed to accompany the handover of the 2023 Mullet Creek Floodplain Risk Management Study and Plan (FPRMSP) hydrological and hydraulic models to consultants that propose to undertake flood assessments within the catchment. The document defines the modelling approach and details the model parameters that were adopted for the FPRMSP. The primary purpose of the Guideline is to ensure that the unique aspects of the hydrological and hydraulic models are captured in future flood assessments using the Mullet Creek models.