Same old barrier, new technology - the River Restoration ......
Transcript of Same old barrier, new technology - the River Restoration ......
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Same old barrier,
new technology
The Wissey Siphon
Marcus Widdison – Aquatic Control Engineering
Kye Jerrom – Environment Agency
RRC Fish Passage Workshop
29 April 2013
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Aquatic Control Engineering Ltd …for innovation and versatility
INSIDE THE SIPHON FISH LADDER
Penstocks allow for flushing to remove
debris
Baffles are on alternate sides
minimising turbulence in pools
Hatches to allow access
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Aquatic Control Engineering Ltd …for innovation and versatility
THE SIPHON FISH LADDER
Vacum pump regulates and maintains the size of
the air bubble Flow rate determined by
size of air bubble
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Aquatic Control Engineering Ltd …for innovation and versatility
PRODUCT SUMMARY
• Pipe diameter from 0.8 – 2.4m diameter
• Made from a coated GRP Vinylester
• Fully UV and osmosis resistant
• 40 Tonne point load
• Auxiliary flow available if required to compete against other flows
• Low maintenance requirement
• Entrance and exit chambers provide dark and quiet shelter for fish
• Quick installation time
• Passes a wide range of fish species including bottom dwelling species
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Aquatic Control Engineering Ltd …for innovation and versatility
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Aquatic Control Engineering Ltd …for innovation and versatility
European Eel
perch
Bream
Bleak
Roach
Spined Loach
Gudgeon
Pike
Independent Data from VisAdvies
Independent Data from ARCADIS
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Great Ouse
Wissey
Cut Off Channel
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River Wissey
River Wissey
Cut Off Channel
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What were the drivers for fish passage?
WFD – Good ecological status by 2015
Failing for fish (gudgeon, roach, spined loach, pike, perch)
Fish passage highlighted as a reason for failure
Improve fish classification from moderate to good
Positive impacts on adjoining tribs, Gadder, Watton Brook,
Stringside stream
Eel regulations 2009
Compliant with Fish Passage Regulations
Norfolk sea trout fishery
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The problem:
What did we need:
Maintain flood defence integrity
Suitable for all species
Deliver environmental outcomes
Meets current legislation
Cost effective
1.8m head difference
2 way passage
The Options:
Do nothing
Barrier removal
Fish pass flap
Natural bypass channel
Larinier fish pass
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Downstream inlet box
Upstream outlet box
Diversion sluices
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Design parameters?
Suitable for…
Slow water coarse fish 10 – 60cm
Eel 10 – 100cm
Minor species 3 – 12cm
Sea trout 30 – 60cm
Low flows, minimal water consumption
Minimum 0.05m/s
Optimum 0.11m/s
Maximum 0.4m/s
Operational with flows between Q10-Q95
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Installation and construction:
8 weeks in total, (5 days installation)
4 sections, 3 lorries, 1 crane
Minimal access delays to
No accidents
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The finished product:
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Does it work??? What the monitoring
should tell us:
Species and size ranges that use the siphon
Seasonal activity
Travel times and failed attempts
If individuals use the siphon on more than one occasion and in
either direction
The effect of environmental influences, such as temperature, river
level and flow, competing attraction flows on fish movement.
Once passed this barrier, are others a problem?
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5 year monitoring programme in combination with
Cranfield University
Fyke netting, Passive Integrated Transponder (PIT)
tags, accoustic tags, video cameras, DIDSON, ADCP
(Acoustic Doppler Current Profiler)
3200 fish over the study period.
Sea trout spawning runs,
Elvers moving upstream,
Silver eels moving downstream,
Coarse fish spawning movements.
Monitoring programme:
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Fyke netting:
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Tagged fish: Chub: 283 mm
Perch: 190 mm
Pike: 677 mm
Rudd: 155 mm
Sea trout: 553, 554 and 654 mm
Tench: 200 and 231 mm
Roach 120 mm – 270 mm x 118
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Length (mm)
roach n= 118
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Monitoring summary:
In the first month, 10 species have used the siphon, ranging in size
from 65 – 553 mm.
Refuge area for fish. . .
We predict that more fish will use the siphon when the gate is closed
and the flow from the siphon is the only attractant.
Sea trout movements
Evidence suggests that fish will habituate to the use of the siphon
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Video camera/ARIS:
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The Wissey project…
Novel UK design for full fish passage
Nine months from start to finish
Bid for finance in June 2011, main fix and permissions completed May 2012
All permissions gained
Audited for project and financial management and H&S
Incident-free CDM notifiable project
Total cost £407k (within budget)
Full telemetry and ecological monitoring
Considerations – planning, access, land ownership, water supply, licences, planning, time.