Generating continuous simulation data for Broad Scale Modelling (BSM) This project created three software models to generate rainfall and runoff data for BSM to assess flood risk and climate change impact. From: If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email: defra.helpline@defra.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use. Details Broad Scale Modelling (BSM) has been identified as a priority area for investigation. It’s needed to support the process of making decisions when assessing and managing flood risk. This includes when assessing the impacts of climate change and altering how land is used. To achieve BSM, hydrology models using continuous simulation are needed.