University of Technology Sydney: Catchment Modelling Design Report

This report details the design of a catchment modelling system to assess the impact of fluvial and pluvial flood flows in the Blackwattle Bay catchment area of Sydney. The study area, characterized by high-density urban development, necessitates a focus on pluvial floods. The report outlines the key components of the modelling system: rainfall estimation (generation), surface runoff estimation (collection), overflow modelling, and hydraulic modelling (transport). The rainfall estimation method involves dividing the area into sub-catchments with rain gauges and flow meters. Surface runoff is analyzed using loss models, specifically the Initial Loss-Continuing Loss Model. The report discusses initial and continuing losses, including interception, depression storage, evaporation, and infiltration. The hydraulic modelling component is also considered, ensuring a comprehensive approach to flood assessment. The methodology includes the conceptual design and data requirements for implementing the proposed modeling system, with consideration for the challenges of urban catchments. The report follows the assignment brief, providing a design report suitable for peer review by specialists in urban catchment modelling. The report addresses the objectives of assessing the impact of fluvial and pluvial flood flows in the catchment areas. This report offers valuable insights into catchment modelling and flood analysis.