Envireau Water Hydrologists Share NFM Knowledge at River Restoration Conference
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May 1, 2019

Rebecca Haw and Michael Underwood, Hydrologists in our dedicated surface water team were pleased to share their knowledge in Natural Flood Management (NFM) at the Annual River Restoration Conference this week.

Rebecca’s poster discussed “A pragmatic approach to evaluating the impact of woodland creation on slowing the flow”:

Practical applications of woodland creation for slowing the flow is limited partially due to the lack of evidence supporting the potential benefits. As with many NFM options, such as leaky dams, assessing woodland creation’s impact on flood risk across a range of storm magnitudes is challenging in the field. As such how can alternative methods be used to aid NFM design on a catchment scale? A useful alternative to field-based research was identified as hydraulic models. This approach facilitated the assessment of different scale and spatial woodland creation across impact on a flood hydrograph across a range of storm magnitudes. Model results support the use of this method in flood mitigation. This research provides a pragmatic approach to designing and predicting the location of woodland creation within a catchment to maximise the benefit of reducing flood risk. This assessment method can be used as a design tool for designing catchment scale NFM schemes. You can view the full poster below:

Michael was pleased to present a poster on “The application of 2D hydrodynamic modelling for assessing the effectiveness of NFM at a catchment scale”:

Evidence for the effectiveness of NFM measures under different rainfall event magnitudes, at the catchment scale, is limited. This due to (1) the scientific uncertainty about the cumulative impacts of NFM measures within catchments, and (2) the relative immaturity of numerical modelling tools for making predictions about the effectiveness of NFM measures. Recent innovations in 2D surface water modelling and the increased availability of high-resolution topographical datasets have unlocked the potential to quantify the cumulative impacts of many small NFM measures distributed across catchments of varying scales. Michael’s poster quantifies the effectiveness of four types NFM measures at reducing downstream peak discharge for rainfall events of different magnitude at the small catchment. You can view the full poster below:

Read more about the key learnings that our team took away from the RRC conference here.

Envireau Water offers comprehensive NFM and river geomorphology services. The technical aspects of NFM and river geomorphology brings together the skills deeply embedded in our expert team, from surface water hydraulics, superficial geology, alluvial sediment transport, mapping and surveying. Learn more here. If we can support you with a project, contact us on 01332 871 882 or info@envireauwater.co.uk.