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River Severn Regulation

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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  1. River Severn Regulation

  2. 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.

  3. Beneficiaries of River Regulation • Abstractors and Water Companies • Fisheries • Tidal Environments • Navigation • Hydro-electric Power • Recreation

  4. 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.

  5. 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

  6. 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

  7. 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.

  8. 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

  9. 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.

  10. 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

  11. 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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