The TTP will be built above 2 of the storm tanks in Mogden. This will involve piling for supportive structures and embankment works on the eastern side of Mogden and an interception shaft. The main tunnelling works will involve 24/7 works on the western side of Mogden.
In 2025 RAPID highlighted that there is no “… detailed plan for [an] alternative option if the space at Mogden Wastewater Treatment Works is no longer available to use. The space is limited and in high demand and finding an alternative space may lead to changes in the TTP layout, design, and location within Mogden. This could lead to an impact on the scheme costs and programme.”.
It is incredible that Thames Water has not shown that construction of the TDRA infrastructure will not interfere with the operation of Mogden STW nor with the need to increase the capacity of Mogden over time.