# RIM2D ### Description Rapid Inundation Model 2D (RIM2D) model is an advanced GPU-accelerated hydraulic simulation tool, designed primarily for urban pluvial, fluvial and coastal flood risk assessments and forecasting. It incorporates information about built-up urban areas as flow obstacles, and incorporates considerations for infiltration and urban drainage. ### Model Specifications | Model Specification | Description | | ----------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Model Type | Deterministic flood model, employing a physically based hydraulic simulation to model urban pluvial and fluvial floods and water flow dynamics. | | Associated Probability Method | No probabilistic variability, although the integration of stochastic methods (using Monte Carlo simulations) has been done to account for uncertainties inherent in the model (Khosh bin Ghomash, et al., 2025, doi: 10.5194/nhess-25-975-2025) | | Spatial Resolution | Flexible, can be adjusted based on the specific requirements. As an example, in a study focusing on the 2021 Ahr Valley floods, spatial resolutions of 1, 2, 5 and 10 meters were tested (Khosh Bin Ghomash, et al., 2024, doi: 10.5194/nhess-2024-139). While all resolutions performed well in simulating the flood extent, higher resolutions were shown to better simulate water depths. | | Intensity Parameters | Water depth, flow velocity, inundation extent and duration | | Other Inputs | Digital elevation model, boundary conditions (rainfall/water levels), roughness (land use) map. Can also include building footprints raster, soil infiltration raster, sealed and non-sealed surfaces raster. | | Calibration and Validation | Model parameters can be calibrated and validated by sensitivity analyses and comparison to real-world flood scenarios. | | Effects of Climate Change | Climate model outputs (CMIP6, EURO-CORDEX) could be used as RIM2D simulation inputs. RIM2D can also be run for current flood conditions, results of which can be compared across different climate scenarios to further quantify the impact of extreme rainfall. Hydrological models can compliment RIM2D to provide rainfall-runoff modelling as input to the hydraulic simulation with RIM2D. | | Resources, License | web site: rim2d.eu, repository: (access upon request through contact formular at web page), license: EUPL 1.2 (open source for public research. license fees apply for commercial use). | *** --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://directed-eu.gitbook.io/data-fabric-manual/model-documentation/rim2d.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.