River severn regulation
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River Severn Regulation. River Severn Regulation System. Designed and constructed in the 1960’s. Major component - Llyn Clywedog. Lake Vyrnwy and Shropshire Groundwater Scheme - phases 1-4 at present. Operation is governed by a control point 200km downstream of Llyn Clywedog, at Bewdley.

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River Severn Regulation

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River severn regulation

River Severn Regulation


River severn regulation system

River Severn Regulation System

  • Designed and constructed in the 1960’s.

  • Major component - Llyn Clywedog.

  • Lake Vyrnwy and Shropshire Groundwater Scheme - phases 1-4 at present.

  • Operation is governed by a control point 200km downstream of Llyn Clywedog, at Bewdley.


Beneficiaries of river regulation

Beneficiaries of River Regulation

  • Abstractors and Water Companies

  • Fisheries

  • Tidal Environments

  • Navigation

  • Hydro-electric Power

  • Recreation


River severn regulation system1

River Severn Regulation System

  • Statutory duty to ensure flows are maintained.

  • 5-day mean flow at Bewdley - 850Ml/d.

  • Daily mean flow - 650Ml/d at Bewdley.


River severn regulation

Liverpool

Shropshire Ground Water Scheme

Lake Vyrnwy

Montford

Walcot

Buildwas

Shelton

Wolverhampton & South Staffs.

Llyn Clywedog

Ironbridge PS

HamptonLode

Birmingham

Dolwen

Trimpley Res

Frankley

Bewdley

Elan Valley Reservoirs

Mythe

Gloucester

Input flow readings/abstractions into Spreadsheet to

forecast the next few days and maintain the level at

Bewdley Gauging Station


How do we regulate

How do we Regulate?

  • Monitor Flows at strategic points downstream towards Bewdley.

  • Follow operating rules - make necessary releases from both reservoirs and groundwater based on current drawdown levels from Llyn Clywedog reservoir.

  • Monitor abstraction sources upstream of Bewdley -

    • Shelton, Ironbridge, Trimpley and Hampton Loade


How do we regulate 2

How do we Regulate? (2)

  • Use a spreadsheet tool to calculate predicted recessions at Bewdley.

  • Lag times from reservoirs/ Met Office rainfall forecasts to calculate Bewdley Flows.

  • Daily liaison with Hampton Loade operators to discuss predicted and actual abstractions.

  • Receive daily STW Trimpley abstractions via e-mail.


Release options

Release Options

  • Routine releases of 18.2 Ml/d from Llyn Clywedog, maximum 500Ml/d

  • 45 Ml/d from Lake Vyrnwy depending on local inflows, max 450Mld.

  • Shropshire Groundwater – maximum 185Ml/d


How hampton loade help us

How Hampton Loade Help us

  • Can map the 850Ml/d at Bewdley by altering their intake of water by observing the flow at Bewdley using telemetry.

  • Can use Chelmarsh as secondary regulation. So if flow at Bewdley is close to 850Ml/d they can utilise the bankside storage.


River severn regulation

Naturalised Bewdley flow without influence of

losses from abstractors and inputs from

Reservoirs and groundwater (lagged accordingly)

Combined abstraction from

Trimpley, HL, Ironbridge, Shelton

Daily Mean Flow from Bewdley


River severn regulation

Based on predicted recessions and lagged response

from water sources we get a predicted daily mean

flow for Bewdley

Spreadsheet then calculates the 5-day mean based on the average

of the 5-daily mean flows as shown previously


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