Here's the update from the inquest, held today. There is a detailed report at the link, I've just posted the main headlines below.
An inquest held at Eastbourne Town Hall today (Thursday, January 28), heard how the young father had drunk alcohol and used cocaine on the night he went missing
Mr Knott’s primary cause of death was confirmed as drowning in salt water.
East Sussex coroner Alan Craze recorded a conclusion of accidental death.
Firefighter who went missing in Lewes accidently drowned in River Ouse, inquest hears
I remember us discussing if he had taken drugs and might have left to pick up more.
Salt water! Lewes is 8 miles from the sea. Gonna have to read up on tidal rivers, I've never really thought about rivers being salty.
The Hudson River in NY can be brackish up to 153 miles (near Troy, NY). So it is possible that, depending on the tide that the river is fairly brackish. The Delaware River is brackish and tidal to north of Trenton, NJ (approx. 133 miles).