Ripple Effect

Hello to all,

I am almost ready to start modeling my first water scene and would like some advice if available please. A pic of the area I will be working on is here :-

www.geocities.com/karldesign/riverarea

Background:

There are two effects I need to achieve, the first is fairly fast flowing water, just beyond the trestle is a small waterfall (clear silicone) from a higher level. From the waterfall to the trestle is approx 6" which I would like to attempt to model as flowing, disturbed water, disturbed from the waterfall and the trestle legs based in the ‘water’.
After the tresle the river widens and ‘slows’ so I would like to attempt a calmer appearance but stil with ripples and the appearance of flow. ( a small fishing pier, boat house and bait shop will be built here at some point , hopefully)

I have pretty much decided to use epoxy resin as the base but I need help on how to achieve the effects over this.

Currently the riverbed has just been sealed with gloss poly, and while it actually looks quite good in the photos ( which pleasantly surprised me) when standing there it lacks depth.

any advice or links would be greatly appreciated.

all the links I have found say use epoxy or poly to achieve results but dont actually describe how.

I am a complete beginer at this hence the basic questions.

Have fun and be safe.