Local detailed models cover a smaller area in more detail and seek to represent most, if not all, flood risk mechanisms affecting that location in an integrated way. Key flow processes can be represented in one, two or three dimensions and models can be dynamically linked to provide the most appropriate representation where necessary (e.g. 1D river channel or subsurface pipe network model linked to a 2D floodplain model).
These models often require more input data to develop and are typically more computationally expensive to run. After a careful process of calibration and validation, against observations from past flood events, these models are often run for a number of different scenarios to support detailed hydraulic analysis and the design of hydraulic structures, such as weirs, bridges and culverts, and flood defence schemes.