environmental flows in europe mike acreman. green and pleasant land? thames basin 10,000 km 2 650 mm...
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Environmental flows in Europe
Mike Acreman
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Green and pleasant land?
Thames basin10,000 km2
650 mm rainfall 15 million people
significant water stress
recycled 7 times
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The River Thames 1858•The Great Stink•Smell of Thames - untreated human waste and effluent
•Parliament suspended•Prompted sewerage
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The River Thames 2008
• Fishing, boating, swimming ....
• Spiritual re-connection• Eco services restored
e.g. water purification
• 2015 Winner of International Theiss River Prize
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150 years of work
Clear long term visionA journey with people Key steps 1865 2015sewerage installedindustrial pollution controlenvironmental flows nutrients (P stripping) nano-particles, oestrogenwater trading
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You can’t please all of the people all of the time
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but you can please some people some of the time
• 2000 years of management
• Important heritage• Protected for
managed habitats• Natural conditions not
desirable
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Which reference conditions?
natural10,000 BC
golden age1821
when I was young
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European Water Framework Directive
(nearly) totally undisturbed
slight alterations
moderate alterations
major alterations
severe alterations
High
Good
Moderate
Poor
Bad
OK
Reference Conditions
can’t do Good Ecological Potential
Ecological Status
measuresneeded
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Integrated status
• Chemical status - pollutants, oxygen, acidity ...
• Biological status - algae, macrophytes inverts, fish
• Hydro-morphology – flow, channel naturalness
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Thames River Basin Plan
Contents• Current state• Actions to improve• Future state (targets)• Implementation plan• Adaptive management
developed through consultations with organisations and individuals
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River management classes
High class - naturalGood - semi-natural Moderate - working riverBad - polluted river
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2012 Blueprint to Safeguard Europe's Water Resources
Pressure on river ecosystems• No 1 pressure = dams, land
drainage; flood embankments
• No 2 pressure = over-abstraction of water → identification of “ecological flow”
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Natural river flows
time
dis
ch
arg
e
channel maintenance flood
floodplain connectivity
maintenance flows for spawning and dispersal
freshet trigger flows for migration
low flows for juveniles
J F M A M J J A S O N D
All aspects of the flow regime are important for some element of the river ecosystem
not right
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Specifying environmental flows
Direct abstraction
Reduced baseline – maintain variability
Restrictive management
Impoundment
Magnitude and variability may be reduced; magnitude may be increased
Active management
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Abstraction management
• How much can we alter the flow regime ...
• ... but maintain desired conditions?
• Current UK standards -developed by expert panels – i.e. synthesis of knowledge and experience
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Type or sub type
Season flow > Qn60 Flow > Qn70
flow > Qn95 flow < Qn95
Apr – Oct
30 25 20 15 A1
Nov – Mar
35 30 25 20
Apr – Oct
25 20 15 10
A2 (ds), B1, B2, C1, D1
Nov – Mar
30 25 20 15
Apr – Oct
20 15 10 7.5
A2 (hw), C2, D2
Nov – Mar
25 20 15 10
Jun – Sep 25
20
15 10 Salmonid spawning & nursery areas (not Chalk rivers)
Oct – May 20 15 flow > Q80
10 flow < Q80
7.5
Headwaters
Maximum abstractions % to meet GES
Lowland meandering
Middle reaches
High flow DroughtMedium flow
Low flow
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0
20
40
60
80
100
120
0 2 4 6 8 10 12 14 16
flow
eco
log
ical
sco
re
UK Evidence of ecological response to flow
LIF
E s
core
Flow index
1991
1997
2001
2009
No threshold
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flow flow flow
flowflowflow
Eco
syst
em s
core
Eco
syst
em s
core
Eco
syst
em s
core
Eco
syst
em s
core
Eco
syst
em s
core
Eco
syst
em s
core
sensitive riverslow abstraction
robust rivershigh abstraction
River sensitivity
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Impoundment releases
Heavily Modified Water Body
Target = Good Ecological Potential
Best practice
Stakeholder objectives
Dams have major control over flow regime
Design flow releases to meet desired ecosystem services
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E-flow releases for GEP
time
dis
ch
arg
e
channel maintenance flood
floodplain connectivity
maintenance flows for spawning and dispersal
freshet trigger flows for migration
low flows for juveniles
Quantity – magnitude, timing, duration, frequencyQuality – temperature, sediment
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E-flow release regime
time
dis
ch
arg
e
environmental flow
natural flow
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Risk of future ecological impact from hydrological alteration
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Adaptive management
• E-flow assessments uncertain
• Responses un-predicable• Circumstances change• Need to act, monitor,
evaluate and adjust• Not admission of error
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Paradigm change (after WWAP)
EIA
EOA
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Solutions in Thameswetlands, floodplains restoration to store water and purifies it naturally- multiple benefitse.g. human health
Water trading; water saved can be sold to another user
New reservoir – last resort
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Floodplain wetlands control floods
1998 flood flow Oxford
with no floodplain
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Conclusions• Decide what you want to achieve• Set long term goal and small steps• Define baseline and objectives• No simple answer, choose appropriate method • Develop indicators that response to flow• Define impacts of future climates/water needs• Looks for opportunities of ecosystems• Take adaptive management approach
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THANK YOU