Recent years have seen a significant expansion in high head run-of-river hydropower developments in Wales, raising concerns about the potential impacts of these schemes on the habitats and geomorphology of Welsh rivers. In response, Natural Resources Wales (NRW) and the RRC are conducting a project to investigate the current level of understanding of the impacts, and the potential ways to monitor schemes in order to strengthen the evidence base. This should then feed into best practice guidance and design enabling us to minimise the geomorphological impact of hydropower developments.