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Using a Before After Control Impact experimental design, we quantified the effects of a beaver dam sequence on the flow regime of a stream in SW England and consider the mechanisms that underpin flow attenuation in beaver wetlands. Rainfall\u2010driven hydrological events were extracted between 2009 and 2020, for the impacted (<jats:italic>n<\/jats:italic>\u00a0=\u00a0612) and control (<jats:italic>n<\/jats:italic>\u00a0=\u00a0634) catchments, capturing events 7\u2009years before and 3\u2009years after beaver occupancy, at the impacted site. General additive models were used to describe average hydrograph geometry across all events. After beaver occupancy, Lag times increased by 55.9% in the impacted site and declined by 17.5% in the control catchment. Flow duration curve analysis showed a larger reduction in frequency of high flows, following beaver dam construction, with declines of Q5 exceedance levels of 33% for the impacted catchment and 15% for the control catchment. Using event total rainfall to predict peak flow, five generalized linear models were fitted to test the hypothesis that beaver dams attenuate flow, to a greater degree, with larger storm magnitude. The best performing model showed, with high confidence, that beaver dams attenuated peak flows, with increasing magnitude, up to between 0.5 and 2.5\u00a0m<jats:sup>3<\/jats:sup>\u00a0s<jats:sup>\u22121<\/jats:sup> for the 94th percentile of event total rainfall; but attenuation beyond the 97th percentile cannot be confidently detected. Increasing flow attenuation, with event magnitude, is attributed to transient floodplain storage in low gradient\/profile floodplain valleys that results from an increase in active area of the floodplain. These findings support the assertion that beaver dams attenuate flows. However, with long\u2010term datasets of extreme hydrological events lacking, it is challenging to predict the effect of beaver dams during extreme events with high precision. Beaver dams will have spatially variable impacts on hydrological processes, requiring further investigation to quantify responses to dams across differing landscapes and scales.<\/jats:p>","DOI":"10.1002\/hyp.14735","type":"journal-article","created":{"date-parts":[[2022,10,14]],"date-time":"2022-10-14T06:08:45Z","timestamp":1665727725000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Exploring the dynamics of flow attenuation at a beaver dam sequence"],"prefix":"10.1002","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9451-5010","authenticated-orcid":false,"given":"Hugh A.","family":"Graham","sequence":"first","affiliation":[{"name":"Centre for Resilience in Environment, Water and Waste (CREWW), Geography College of Life and Environmental Sciences, University of Exeter  Exeter UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0814-7894","authenticated-orcid":false,"given":"Alan K.","family":"Puttock","sequence":"additional","affiliation":[{"name":"Centre for Resilience in Environment, Water and Waste (CREWW), Geography College of Life and Environmental Sciences, University of Exeter  Exeter UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark","family":"Elliott","sequence":"additional","affiliation":[{"name":"Devon Wildlife Trust  Exeter Devon UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karen","family":"Anderson","sequence":"additional","affiliation":[{"name":"Environment and Sustainability Institute University of Exeter, Penryn Campus  Penryn Cornwall UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard E.","family":"Brazier","sequence":"additional","affiliation":[{"name":"Centre for Resilience in Environment, Water and Waste (CREWW), Geography College of Life and Environmental Sciences, University of Exeter  Exeter UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,11]]},"reference":[{"key":"e_1_2_8_2_1","volume-title":"gridExtra: Miscellaneous functions for \u201cGrid\u201d graphics","author":"Auguie B.","year":"2017"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/jfr3.12789"},{"key":"e_1_2_8_4_1","first-page":"195","volume-title":"Restoring the European beaver: 50\u2009years of experience","author":"Baskin L. 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