the multiple benefits of catchment restoration...the multiple benefits of catchment restoration prof...
TRANSCRIPT
![Page 1: The multiple benefits of catchment restoration...The multiple benefits of catchment restoration Prof Alastair Driver FCIEEM Catchment restoration specialist and ecologist Specialist](https://reader030.vdocuments.mx/reader030/viewer/2022040305/5eafff078819aa6a091516f5/html5/thumbnails/1.jpg)
The multiple benefits of catchment restoration
Prof Alastair Driver FCIEEM
Catchment restoration specialist and ecologist
Specialist Advisor, Rewilding Britain
@AliDriverUK
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Peat bog restoration
Bare and restored peat on Kinder Scout
Evidence from Moors for the Future: The weight of Particulate Organic Carbon trapped in water flowing down gullies of re-vegetated catchments on Kinder Scout was reduced by over 90% in comparison to those in untreated catchments.
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Upland grassland restoration
Evidence from Berwyn and Clwyd mountains: drain blocking in blanket bog led to flows
during drought periods being more stable and up to 3x higher than prior to blocking
Exmoor Mires
restoration
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Pond creation
Belford Burn, Northumberland
Evidence from Belford Burn: installation of “leaky ponds” led to the following average
reductions in pollutant concentrations downstream during storms: suspended solids 40%,
total phosphorus 25% and nitrate 15%
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Tree planting
Woodland planting on the Belford Burn
Woodland shelterbelt at Pont Bren
Evidence from Pont Bren: infiltration rates are up to 60x higher under young native
woodland shelterbelts compared to adjacent heavily grazed pasture
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Woody debris
Hebden Bridge volunteers learning from Stroud
Leaving woody debris in situ at Holnicote
Evidence from Belford Burn, Northumberland: Installation of 6 large woody debris structures in a
headstream near Belford, more than doubled the travel time for the peak of the flood 1 km downstream
High flow woody debris dam,
Slad Valley, Glos
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Beaver reintroduction
Dec 2014 hydrograph above and below beavers
Puttock et al 2017
Beaver pond at Boldventure
Evidence from Puttock et al, 2017: peak flows at the Boldventure beaver enclosure are reduced by 30 % below the beaver site, lag times (peak rainfall to peak flow) are much longer below the site (29 %) and water now takes on average of 1 hour to travel through site.
Beaver reintroduction on the R. Otter in Devon
Beaver canal at Boldventure
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Beaver reintroduction
Water quality changes
Evidence from Puttock et al, 2017: At Boldventure in Devon, on average, compared to water entering from intensively managed grassland, each litre of water leaving the beaver-impacted site contained 3x less sediment, 0.7x less nitrogen, 5x less phosphate and 2x more dissolved organic carbon
13 beaver ponds held >100 tons of sediment of which 70% came from
the 20 ha intensively grazed catchment upstream
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Rural river restoration
Evidence from the Tweed: The Salmon fishery in the Tweed catchment contributes over
£18M to the local economy and supports over 500 jobs
Whit Beck restoration in Cumbria
Moses Weir
removal,
R. Irwell
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Urban river restoration
Restoration of the
R. Medlock at
Clayton Vale LNR,
Manchester
Evidence from R. Ravensbourne: Visitors to Ladywell Fields urban greenspace in South
London increased by >250% after restoration of the River Ravensbourne through the park
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SuDS installation
Hollickwood Primary Susie Earnshaw Theatre School
Queen Elizabeth Girls’ School, Pymmes Brook catchment, North London
Evidence from Environment Agency Introduction to SUDS: On average, urbanisation
without SUDS trebles the rate of run-off during storm events
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Putting it all together
Re-wetting upstream bog Leaving woody debris in situ
Evidence from Holnicote estate – Somerset: £160K NFM work reduced flood peak by 10%
and prevented £30M of assets (90 properties) from flooding during a 1 in 25+ year flood
event on Xmas Eve 2013.
Downstream
woody debris
combined with
floodplain
attenuation
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Lowland rewilding
Knepp Estate, Sussex
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Rewilding at Knepp
Rewilding at Knepp Estate, West Sussex 2001-2016
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Upland rewilding
Sheep or no sheep ?
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Upland tree planting
1999 Carrifran – Scottish Borders 2015
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Soils – “the elephant in the room”
Evidence from Palmer and Smith field investigations of soils in SW England, 2013: 38% of soils show signs of enhanced surface water run-off due to soil degradation, with 75% of land under late-harvest crops showing signs of degradation.
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Soils – “the elephant in the room”
Evidence from Defra Soil Strategy for England 2009: 2.2 million tonnes of silt is lost from the land each year in the UK.
Evidence from Cranfield Univ research report on soil degradation for Defra 2011: The total cost to society of soil degradation in England and Wales is £1.2 billion per annum,
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Soils - “the elephant in the room”
December 2013
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25 YEP – Reasons to be cheerful !• Public money for public goods to replace Basic Payment Scheme
• Nature Recovery Network to restore/create 500,000 ha of habitat
• Review of National Parks
• Expanding the use of natural flood management solutions
How do we leave a legacy to be proud of ?• Designated Wild Areas in most National Parks
• A significant increase in the proportion of flood risk management grant-in aid targeted at natural flood management
• Water companies implementing the catchment-based approach more extensively and more consistently across the country
• Large-scale rewilding initiatives prioritised for new public money for public goods subsidy payments
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Thankyou for your attention
“Today’s problems cannot be solved if we continue to think the way we did
when we created them” – Albert Einstein