[Vue 10 x] Make dark water for rendering and little bordeline waves

Hallo everibody,

I applyed a very darl kind of water by Advanced material editor ) but when I render I stelle see trasparency to much. I'd like to make darker (almost without trasparency) water. Any ideas?

If also possible to create some little waves where water meets rock and terrain?

I attach an image to bel more comprensible:

 

Many tahks for help!