United Utilities Sources – WFD Environmental Assessment Report
WFD: North of the border - Groundwater Clews.pdf · 2017-07-18 · Next steps – Refine...
Transcript of WFD: North of the border - Groundwater Clews.pdf · 2017-07-18 · Next steps – Refine...
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WFD: North of the border
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WFD: North of the border
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Key emphasis – predictive based
Limited impact data forces this approach, but…..
Limited existing knowledge...important to assess…
•Why is it at risk?
•Where should we monitor?
•What measures do we need?
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1. GW Bodies
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Bedrock Aquifers
(BGS)
Superficial Aquifers
(BGS)
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Bedrock Aquifers
(BGS)
Productive bedrock aquifers:
Deep & long flow systems →Major catchments
Low productivity bedrock aquifers:
Shallow & short flow systems →Sub- catchments
Superficial aquifers:
Localised flow – not currently used for subdivision
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Simple 3D conceptual models of
•Flow type (fracture, etc)•Storage type•Transmissivity•Flow path length•Flow path depth•Natural chemistry
Mainly for use by non-specialists
GW “Typology”
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2. Risk Assessment
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WFD: North of the border
Receptors
GW body Wetlands GroundwaterRiver and lakes
Vertical pathway Vertical +/- lateral Vertical +/- lateral Vertical pathway
WFD Objectives
Receptor sensitivity
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Prediction
Pressure
Pathway
Receptor sensitivity
GWDTE
Abstraction
Proximity & aquifer
Drawdown
Receptor Rivers
Abstraction
Catchment
Flow vs Q95
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Bedrock Aquifers
(BGS)
Groundwater Vulnerability
(BGS/MLURI)
••Horizontal pathway term Horizontal pathway term (downgradient receptors)(downgradient receptors)
••StorageStorage
••Vertical pathway termVertical pathway term
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Risk Assessment Principles
High predicted impact AND impact data 1a
Mod predicted impact AND impact data 1b
High predicted impact 1b
Moderate predicted impact 2a
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3. Diffuse
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Pressure + pathway
Phosphate
Pressure
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Pressure +
Pathway +
Receptor+
Impacts
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PirimicarbPressure
+pathway
More localised pressure (horticulture)
+
Relatively high EQS
=
Restricted potential impact on ecosystems
PhosphatePressure
+pathway
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4. Point, mining, abstraction examined similarly
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“By products” for monitoring & guidance
•GIS dataset: vulnerability + aquifers + GW receptors
•Point sources with known impacts on groundwater
•Distributed recharge maps
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Next steps
– Refine characterisation outputs (further characterisation)
– Develop monitoring network using risk assessment to prioritise
– Produce procedures guidance to support new Groundwater Protection Policy for Scotland and new regulatory regimes
– Prepare for requirements of GDD
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Legislative situation
• Water Environment and Water Services (Scotland) Act 2003 Controlled Activities Regulations (consultation in April; planned to Parliament in September; expected to commence 2005)
• Diffuse Pollution control regime + restoration powers (expected in 2005/6 to commence 2006)
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Summary
Emphasis on:
1.Predictions
• Simple, but logical concepts (?)
• Consistency / transparency
2.Preparation for the next steps