natural flood management - lawrence belleni, river forth fisheries trust
TRANSCRIPT
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Allan Water Project OfficerRiver Forth Fisheries Trust
- Flooding, NFM & fish
Lawrence Belleni
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Floody hell!
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They’re not going away…..
•Expect a 20% increase in flood peaks by 2080
•Europe- 1:100 flood expected to double in frequency within 3o years(Alfieri et al., 2015)
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…However we’re talking fish
Two bold statements
•Flooding can be positive for fish
•Applying NFM provides catchment resilience & benefits to fish
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Firstly, some benefits from flooding to fish
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What we want? • Rivers with access to good habitat & a steady flow of
clean water
• Catchments that can manage precipitation (resilient)
In regards to flood risk to fish:
• Manageable flow velocity at bankfull
• Channel fish can survive in
Could NFM be the answer?
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Other NFM- catchment resilience
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Kinbuck & Bridge of Allan
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Dunruchan Farm Peatland restoration Project
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Why important?
Knaik Subcatchment
•Size 39km²
•Mostly bare & sheep grazed
•23% of flood peak (Halcrow-Cress Allan Water Scoping study, 2011)
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Monitoring
•4 Pressure transducer flow gauges
•3 rain gauges
•Stirling University research site possibility?
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Positives from the project
• Peatland contributes a store & slow pathway for water to leave the site
• Water quality improvements (DOC & POC)
• Part of a network of measures to manage precipitation
• Contributes to attenuating rapid flash floods
• Contributes to storing carbon and minimising impact of climate change
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To conclude• Flooding can be beneficial to fish also
• NFM can be used to restore natural channel morphology and planform attenuating damaging bankfull flows
• NFM can increase a catchments resilience to precipitation events leading to bankfull flows
• NFM has multiple other benefits to fish and wider society also