I totally see what you mean Ali, not brown like poop brown just not the blue it is at the moment, it almost looks a little tropical. You have the north sea, its a fresher and deeper than the channel, the channel is very sandy and that gives it that brownish hue, but as i said its only brownish a little.

I can grab some photo's for you if you want when the weather is better of the canals and water ways around the birmingham area, they give a real good green/brown waterway colour.

But hey mate, its your mod, the community will support how you want to make it buddy.