LOCATION:
A £7.7m project for a CMDP Joint Venture to improve the reservoir's drawdown rate comprising installation of three 1,700mm diameter siphons. In an emergency these would allow the top five metres of the reservoir to be emptied in five days.
The reservoir is a 28m high earth embankment dam with a crest length of around 930m. It has a capacity at top water level of around 31,000 megalitres.
- Partial construction of the reinforced concrete priming chamber structure on the landside of the existing earth embankment dam.
- Bulk excavation works to allow for the construction of the discharge chamber and discharge culvert (circa 16,000m3).
- Partial construction of the reinforced concrete discharge chamber structure including a 362.5m3 concrete base pour (which is the largest concrete pour in CMDP’s history) and a 160m3 first wall pour of a planned three wall pours in total.
- Installation of ducting and draw pits to provide power and telemetry from the substation to the discharge chamber.
- Procurement and manufacture of 1700mm diameter steel siphon pipework.
- ECI and design development work for the marine installation works of the siphon pipework.
- ECI and design development work for landside screw pile and siphon pipework installation.
Challenge
Due to the complex and challenging nature of the planned works along with the wide variety of civils and M&E interfaces and their associated individual consulting engineers, the design management for the project was particularly challenging.
Solution
Weekly design meetings were established with all parties working collaboratively to address issues and interfaces. There were also a number of focused workshops held where the more intricate elements of a specific works element were discussed and reviewed in greater depth to ensure full integration and understanding from all parties.
Outcome
The combination of weekly design meetings and workshops ensured that the overall design was developed and fit for purpose.
This phase was completed successfully in summer of 2024.
