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Southern Water and South East Water Tasks. Conor Linstead. Southern Water Water Resource Investigations. Two key elements: Little Stour and Wingham River Environmental Appraisal Report Kent and Sussex Hastings Water Resources Management

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southern water water resource investigations
Southern WaterWater Resource Investigations

Two key elements:

Little Stour and Wingham River Environmental Appraisal Report

Kent and Sussex Hastings Water Resources Management

Regional Studies evaluating desalination, effluent re-use & demand management options

slide4

July 2006

March 2007

Nailbourne at Bourne Park

(Photos: Alfred Gay. Made available under GNU Free Documentation License)

little stour wingham river environmental appraisal report5
Little Stour & Wingham River Environmental Appraisal Report

Determined ecological status of each river reach

Link status to factors that influence the ecology (flow, channel form, water quality, river management, abstraction etc…)

Put into perspective the influence of flow and abstraction

Suggest priorities for further investigation and inclusion in possible Action Plan

key conclusions
Key Conclusions

Natural flow characteristics are still the key determinant of the ecological communities

Historic changes to channel morphology greatest impact on ecological communities esp.

upper & lower Little Stour

Wingham River

Siltation has a significant effect on fish and invertebrates

key conclusions7
Key Conclusions

Abstraction-induced low flows:

Most sensitive reaches to abstraction are the lower Nailbourne and upper Little Stour reaches

Abstraction-induced impacts are relatively minor on the Wingham because of very degraded physical habitat and the enriched water quality

No impact on the ecology in the middle Nailbourne

Abstraction reduces flows in the lower Little Stour reach, but probably has minor influence on the ecology

Little is known about the flow regime of the upper Nailbourne.

kent and sussex hastings water resources management
Kent and Sussex Hastings Water Resources Management

Kent Thanet WRZ

Kent Medway WRZ

Sussex Hastings WRZ

© Southern Water

new water supply option appraisals
New water supply option appraisals

Three broad categories of options:

Desalination (marine and tidal)

Effluent re-use

Demand management and water efficiency options

Phase 1: Option identification (61) & screening

Phase 2: More detailed appraisal

Phase 3: In-depth appraisal (ongoing)

desalination options kent thanet
Desalination Options – Kent Thanet

One option within Stour carried forward from Phase 1

Tidal site adjacent to a WWTW

Use existing outfall (21Ml/d licenced)

Phase 2 considered

Evaluation of the yield improvement

Engineering description of potential operation

Technical risks

Environmental designations

Aquatic environmental impacts

Planning assessment

effluent reuse kent thanet
Effluent reuse – Kent Thanet

One option with the Stour carried forward from Phase 1

Transfer of 18Ml/d outflow from WWTW to support flows within the Stour upstream of water supply works

Phase 2 considered:

Aquatic environmental impacts

Environmental and planning assessment

Technical and engineering issues

Additional tertiary treatment

New pipework

demand management kent thanet
Demand management – Kent Thanet

Phase 2 options considered:

Increased household metering

Rising block tariff

Leakage reduction

Combined household water efficiency options

Combined non-household water efficiency options

demand management
Demand management

© Southern Water

new water supply option appraisals14
New water supply option appraisals

Phase 3

In-depth appraisal of these options on-going

Evaluating the Kent Thanet WRZ options in the context of the other WRZs

south east water investigations
South East Water investigations

Two major studies running from 2005 to 2010: Great Stour and Upper Great Stour

Upper Great Stour

Abstraction focused on small number of major sources

Can larger number of smaller sources deliver the same abstraction levels with reduced impact?

Consider future demand and climate change

Great Stour

explore the possibility that abstraction is impacting on the flow regime in the reach between Wye and Thanington

Phase 1 scoping studies, Phase 2 investigations

upper great stour investigations phase 2
Upper Great Stour Investigations – Phase 2

Focus on understanding hydrology of the Hothfield Bogs

Period of monitoring groundwater levels against rainfall and PWS abstractions

Geological modelling

Surveys of hydrochemistry of headwater springs, sites around Hothfield Common SSSI

Ground truthing of the soils and geology data for the Hothfield Bog

NVC surveys of Bogs 1-4 and margins

upper great stour investigations phase 2 conclusions
Upper Great Stour Investigations – Phase 2 Conclusions

Geological modelling confirmed the site is underlain by the Folkestone Formation which provides groundwater seepages

Bog 4 within Hothfield common confirmed to rely on ground water input (fen habitat)

The areas of influence associated with groundwater abstractions are not considered likely to impact on Hothfield Common SSSI

Suggest that there is sufficient recharge to the aquifer to feed the demands of Bog 4 as well as fully licenced abstraction

great stour investigations phase 2
Great Stour Investigations – Phase 2

Review of groundwater level monitoring network and equipping key wells with water level recording equipment

Use geological maps and air photographs to reduce uncertainty of gravel distribution

Monitor groundwater levels and recorded flows against abstraction rates over a 12 month period

Develop conceptual understanding and report results and interpretation

Study ongoing

putting the work into context
Putting the Work into Context

Confirms importance of simultaneously pursuing water quality and water quantity approaches to improving ecological status

While current impacts of abstractions are limited, protecting future abstractions requires water quality and habitat to be addressed

WFD targets on ecological status may limit volume of abstractions in situations of poor water quality

Limitations imposed by climate change

Evidence base for choosing top-down vs. bottom-up (catchment-based) solutions

Targeted water efficiency advice vs. capital projects (effluent reuse etc)

On-farm advice vs. End-of-pipe water treatment