The article on Thames Water's plans for a desalination plant on the Thames Estuary (News 29 June) states that the company aims to abstract water from the river during the last three hours of each ebb tide when salinity is at its lowest. .
But why not abstract it above the tide limit, that is, above Teddington Weir, avoiding all salinity and the need for any plant at all. The same quantity as is proposed to be desalinated can then be pumped down existing extraction boreholes to replenish the aquifer.
That seems too simplistic not to have been considered.
But why not?
KR Rollinson, Orchard House, Ablington, Cirencester, Gloucestershire, GL7 5NU