The Middle Catchment

• The River Derwent
• Ogston Reservoir
• Gauging Station at Whatstandwell
• Carsington Water
• Henmore Brook

The River Derwent

The River Derwent at Whatstandwell, near Matlock

Here the river is in the midland zone of the catchment, a zone characterised as a transfer zone. Sediment yield is low, as is deposition of sediment. Water quality is less soft than the upland zone, and there are gains from precipitation, although the principle gain in flow is collection from sub-catchments.

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Ogston Reservoir

Ogston Reservoir Water Treatment Works

Ogston Reservoir impounds water from a 24 km² sub-catchment giving a basic yield of 14 Ml/day. However, a transfer pipeline from the River Derwent at Ambergate augmented the reliable yield (before construction of Carsington Water) to 25 Ml/day. Attached to Ogston Reservoir is a water treatment works, the output of which supplies, by an either way link, Chesterfield and the Derwent Valley Aqueduct.

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Whatstandwell Gauging Station

The gauging station at Whatstandwell

With a situation on the River Derwent between the confluences with the River Wye and River Amber, flow data here determines the level of abstraction permitted at Ambergate.

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Carsington Water

Carsington

Carsington Water is a pumped storage scheme outside the Derwent Catchment. Designed to ensure the security of supply, reservoir filling is by pumping raw water at times of high flow in the River Derwent. Then, at low flow it is possible to gradually release water from Carsington Water back into the River Derwent or Ogston Reservoir, thus supporting the Derwent baseflow and Ogston yield.

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Henmore Brook

An artificial wetland, to control nitrate runoff, adjacent to Henmore Brook (a tributary of the River Dove) just below Carsington Dam

Henmore Catchment above Carsington Water contributes approximately 8% of the total capacity of Carsington Water, with Henmore Brook only requiring a compensation release of 2.7 Ml/day.

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