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Consulting Hydrometry Case Studies

Dwr Cymru Welsh Water
Compensation Flow Gauge, Cwmystradllyn

HLS have been engaged by Dwr Cymru Welsh Water since 2000 to operate, maintain and improve their hydrometric network. One of the projects involved the feasibility, design and installation of a new ultrasonic transit-time flow gauge on the discharge compensation flow channel from Cwmystradllyn Reservoir in North Wales.

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Wessex Water
Low-Flow Monitoring on the River Yeo, Somerset 

Wessex Water contracted HLS to install a new flow-gauge to provide flow data on the environmental impact of abstraction upstream and downstream of a riverside borehole for public supply. The purpose of the investigation was to produce accurate flow records during an extended pumping-test period.

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Romney Marsh, Environment Agency
Hydrometric Design on the Kent Ditch

HLS was commissioned by the Environment Agency (EA) Southern Region, as sub-consultants to Halcrow Consulting Engineers, to undertake feasibility and hydrometric design of 6 sites on streams feeding the Romney Marsh.

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Environment Agency, East Devon
Flood Event Appraisal

East Devon was hit by an exceptional storm on the night of the 29th/30th October 2008. The combination of hail and intense rainfall led to severe flooding of towns and villages and there was appreciable erosion of top soil from farmland. HLS was appointed to undertake a full hydrometric analysis of the event. 

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Somerset Drainage Board Consortium 
Southlake Moor Trial

The Southlake Moor Favourable Condition Project sought to restore 200ha of grazing marsh habitat by improving water level management and allowing winter flooding on Southlake to provide valuable habitat for migratory birds. HLS successfully delivered an initial trial project recording water levels at three key sites, including inflow and outflow control structures. The project successfully integrated ecological benefits with flood attenuation and sustainable farming practices.

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