In this issue, Tim Burt describes the ways in which hydrograph characteristics can be related to the characteristics of the catchment. Runoff and catchment hydrology are important parts of the water cycle and underpin our understanding of flood risk and mitigation. This is an area where there are good opportunities for you to undertake your NEA.
Information on river flow in England and Wales is available from the Environment Agency Hydrology Data Explorer site at www.tinyurl.com/yc2nm5u8 This is a rich dataset which will allow you to explore the relationship between hydrograph behaviour and catchment characteristics. For example, by extracting hydrograph data for a range of catchments and comparing them to land use data you could consider the role of changing land use on the generation of storm runoff. Basic land use data is available from the ArcGIS schools digital data site at www.tinyurl.com/pcph9em2
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