Save Shepperton Swimming Lake from Sewage?

My friends at Shepperton Lake where I have enjoyed a glorious swim in the past have asked for help with their petition. I will be honest, I do not know the ins and outs of the Spelthorne Channel Thames Scheme. I have included the official write-up below for you to draw your own conclusions.

What I can tell you is that this is a glorious and unpolluted lake with a warm atmosphere, excellent attitude to safety and loyal and numerous group of swimmers. In short, a paradise to many which supports both their physical and mental health. Doesn’t really seem worth risking, does it?

The petition is here: https://chng.it/bQ5TtK6LxN

The write up of the scheme is here: https://www.riverthamesscheme.org.uk/scheme/the-channel-sections