low flow trials learnings involving innovative designs · • 40ml dam on dairy farm • tfr 0.7...
TRANSCRIPT
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Low Flow Trials –
learnings involving
innovative designs
Paul Wainwright
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• Eleven trial sites established in
2015-16
• Marne, EMLR and WMLR
catchments
• Install and test a range of
different devices in different
settings
• Learn about construction and
management challenges
• Monitor hydrological
performance
Objectives
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Criteria for selecting sites
• Landowner amenable/enthusiastic
• Accessibility for construction
• Accessibility for demonstration
• Variable landscape/infrastructure settings
• Where dams could be treated in a series
• Proximate to existing hydro/eco monitoring sites
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Bugle Ranges
• 40ML dam on dairy farm
• TFR 0.7 L/s
• Concrete mechanical bypass
installed
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Marne Catchment - Pipe Bypass – TFR 2L/s
Bypass weir
Low flow
release point
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Controller, battery,
3G antenna, air pump
Dam wall
Water level
Inflows
Electric actuated fail
open vent valve
Electric actuated valve
and flow release outlet
0.1% accuracy
hydrostatic sensor
Inlet foot
valveFlow
meter
Macclesfield Trial Site –TFR 4.5L/s
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• Today is the first step in the process of
implementing the Securing Low Flows
project
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BYPASS DEVICES
• Non electronic
• Relatively cheap
• Robust
• Gravity based - requires minimum 2 degrees of fall
between weir and release point
• Tricky to install in wet/peaty watercourses
• Require maintenance to ensure they don’t block
Pro’s and Con’s of the different devices
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RELEASE DEVICES
• Electronic
• Instrumentation can be expensive
• Reliability
• Quick to install/ can be partly off-site
• Can be installed in wet/adverse conditions
• Maintenance tends to be complicated
• Generally need protection from stock etc.
Pro’s and Con’s of the different devices
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• Landholders generally supportive
• Understand the need to test concepts
• Open to sharing the idea with others
• Interested in the monitoring outputs
The community experience
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1. Is the low flow device doing what it is supposed to do?
• Measure total inflow to dam/arriving at dam• Device what is delivered through the low flow device
Hydrometric monitoring for the low flow
trial sites
2. Reliability of supply for landholder
• Change in storage in dam• Bathymetric survey + water level• Compare low flow and non-low flow scenario
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