Challenge

Hugh Pearl (Land Drainage) Ltd carried out the refurbishment of the feature lake at Chiswick House Gardens, in support of the main contractor, Ground Control Ltd (previously UPM Tilhill).

Part of a wider project, which included reconstructing paths and cleaning statues in the grounds, the lake refurbishment called for a specially engineered water recirculation and pipeline system for managing and cleaning the water.

An existing 600m Victorian culvert ran from the River Thames to the lake. Control works were situated at the lakeside in an historic Thames Water sluice house. The sluice could be left open to fill the lake from the river, but that often meant that all kinds of material would come up the pipe and pollute the lake water.

The proposed refurbishment included the installation of a new system of pumps and a pumping main, which would allow the water to be tested before it was release into the lake.

It was a complex three-year project, involving stringent health and safety requirements and confined spaces works. It also involved numerous stakeholders and various communication challenges, not least in ascertaining whether Chiswick House, the local council or Thames Water owned and was responsible for the culvert.

Solution

Pearl installed a new pumping main along the 600m length of 4m-deep culvert, accessing via manholes every 80m. To satisfy health and safety requirements and best practice, two men had to work together in the culvert at any one time. Gas detectors were deployed, as well as blowers to circulate air. Confined space training was essential, and the teams had to work between tides and monitor rainfall.

The company also designed and fitted a system of pumps on one side of the sluice, as well as switchgear, a control panel and integrated testing apparatus in the sluice house, which were actuated by floats to synchronise with the tide.

When the tidal water of the Thames rose, the pumps fired up and the system tested the water. It then allowed the water to run into the pumping main installed along the length of the culvert and out into the lake, over the existing headwall.

Pearl also installed a new outfall at the far end of the lake, which re-circulated the water back into the Thames.

Outcome

Pearl drew on wide-ranging in-house experience of pipeline, confined spaces, conservation and fabrication work to address the distinctive challenges of the Chiswick House Gardens lake project.

What began as a standard specification developed into a much more complex project as on-site conditions became apparent. The company had sufficient experience and technical expertise to adapt and problem-solve.

The resulting water management system provided much better control over water quality, which in turn led to cleaner, clearer lake water and a much improved appearance.


Challenge

Hugh Pearl (Land Drainage) Ltd carried out the refurbishment of the feature lake at Chiswick House Gardens, in support of the main contractor, Ground Control Ltd (previously UPM Tilhill).

Part of a wider project, which included reconstructing paths and cleaning statues in the grounds, the lake refurbishment called for a specially engineered water recirculation and pipeline system for managing and cleaning the water.

An existing 600m Victorian culvert ran from the River Thames to the lake. Control works were situated at the lakeside in an historic Thames Water sluice house. The sluice could be left open to fill the lake from the river, but that often meant that all kinds of material would come up the pipe and pollute the lake water.

The proposed refurbishment included the installation of a new system of pumps and a pumping main, which would allow the water to be tested before it was release into the lake.

It was a complex three-year project, involving stringent health and safety requirements and confined spaces works. It also involved numerous stakeholders and various communication challenges, not least in ascertaining whether Chiswick House, the local council or Thames Water owned and was responsible for the culvert.

Solution

Pearl installed a new pumping main along the 600m length of 4m-deep culvert, accessing via manholes every 80m. To satisfy health and safety requirements and best practice, two men had to work together in the culvert at any one time. Gas detectors were deployed, as well as blowers to circulate air. Confined space training was essential, and the teams had to work between tides and monitor rainfall.

The company also designed and fitted a system of pumps on one side of the sluice, as well as switchgear, a control panel and integrated testing apparatus in the sluice house, which were actuated by floats to synchronise with the tide.

When the tidal water of the Thames rose, the pumps fired up and the system tested the water. It then allowed the water to run into the pumping main installed along the length of the culvert and out into the lake, over the existing headwall.

Pearl also installed a new outfall at the far end of the lake, which re-circulated the water back into the Thames.

Outcome

Pearl drew on wide-ranging in-house experience of pipeline, confined spaces, conservation and fabrication work to address the distinctive challenges of the Chiswick House Gardens lake project.

What began as a standard specification developed into a much more complex project as on-site conditions became apparent. The company had sufficient experience and technical expertise to adapt and problem-solve.

The resulting water management system provided much better control over water quality, which in turn led to cleaner, clearer lake water and a much improved appearance.


 
 
 
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Hugh Pearl (Land Drainage) address and contact details

Hugh Pearl (Land Drainage) Ltd
New Farm
New House Lane
Bobbingworth
Ongar
CM5 0DJ
Tel: 01277 890274
Fax: 01277 890322
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