Your browser is no longer supported

For the best possible experience using our website we recommend you upgrade to a newer version or another browser.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more

Stability checks are rolled out on Ulley

Site investigations to check stability were carried out on the Ulley dam last week after it was damaged in last summer's floods.

The works included installing vibrating wire piezometers in the boreholes to monitor pore water pressures.

Trenches were also excavated to examine the interface between the clay core, a later concrete extension to the core. Material in the shoulders of the dam will also be examined.

Ulley Reservoir, suffered scour when one of the spillways overtopped during a week of torrential rainfall in June this year. This lead to concerns about the stability of the dam (NCE 28 June).

Water was pumped from the reservoir until engineers deemed levels safe. The dam is still operating at a reduced level.

Last week's ground investigation will assist Rotherham Metropolitan Borough Council's consultant Arup and the All Reservoirs Panel with their assessment of the dam and associated structures and will provide details which can be checked against historical construction records.

"The site investigation was a health check on the embankment," said Arup associate Rachel King."We were looking at stability, whether there were problems with seepage and gathering information for geotechnical analysis. The investigation works were successful.

"We have historical records of the dam which was built in the 1870s. We wanted to see if the dam was like the drawings and it is."

Rotherham Metropolitan Borough Council appointed Arup to oversee the site investigation and Chester-based ground engineer Geotechnics to undertake the site investigation.

Work started on site on the 26 November. Geotechnics' subcontractor Geotechnical Engineering carried out boreholes using a specialist slope-climbing rotary rig.

Initial results of the ground investigation are due this month and Arup expects to report its findings to RMBC in early 2008 to help them with the future management of the asset.

Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions. Please note comments made online may also be published in the print edition of New Civil Engineer. Links may be included in your comments but HTML is not permitted.