South West Water’s plans for desalination plants in Cornwall

Due to unforeseen circumstances our coverage of South West Water’s proposed desalination plant continues at:

South West Water Announce Desalination Plant in Cornwall

Continuing my due diligence regarding the current “astonishingly low” water level in Colliford Reservoir I’ve been searching for hints on South West Water’s recently announced plans for two new desalination plants on the south coast of Cornwall. I’ve been poring over their draft Water Resources Management Plan (dWRMP for short) for 2024, which I downloaded quite some time ago. It’s a hefty document, but given the recent media frenzy about possible desalination plants in Cornwall I’ve been over it with the proverbial fine tooth comb. I eventually discovered the information I was searching for in the last place I looked.

Chapter 8 on “Supply-Side Option Development” seemed the best place to start. It had this to say:

The potential addition of repurposed mines and quarries and desalination as supply side options for our SWW WRZs are being developed in response to the current (2022) drought. At this time, no specific options can be included within our feasible list. Work is ongoing and we envisage options will be progressed to a stage where they can be included in our approach by the time of our Statement of Response. Refer to Annex C of this Chapter for more information on our considerations on the use of desalination as part of our revised dWRMP.

Turning to Annex C, I read:

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The August Heatwave(s) in Cornwall

For the previous article in this series (which is becoming overly lengthy!) please see:

Drought for Cornwall later in 2022?

As the weeks have passed the answer to that question seems increasingly likely to be “Yes”. Hence we’ll begin August 2022 with the current water levels of Cornish reservoirs provided by the South West Lakes Trust:

South West Water also provide graphs for the largest two:

As you can see the water levels in both Colliford and Stithians reservoirs are already below their lowest levels last year. Colliford is also well below its level at the beginning of August 1995, a particularly dry year for Cornwall and other parts of the United Kingdom.

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