It's been a while since you last saw the actual diorama as I've been slowly adding the water for the stream. I've lost count of the number of layers I've poured (I think six but I could be wrong) but it's finally at a reasonable depth, both in terms of resin and how it looks.
Rach layer was very thin (about 5ml per layer across the entire scene) and then painted with thin washes of black and burnt umber to try and add depth. I also had the model resting on an angle for the entire duration so that the stream surface was kept horizontal. This means that now that it is dry it looks like it's flowing downhill. The main problem of course is that the surface is too smooth and looks like slow moving water rather than a fast flowing stream. Hopefully some Woodland Scenics water effects should solve that problem though.