Here is a scene from my recent bridge project. (This is fictional scene, and I suppose a railroad civil engineer would count some rivits for me. LOL ) … I will explain how I made the water under the bridges.
I used an acrylic light panal from a drop ceiling. The kind is called “crushed ice”. I salvaged what I needed from a broken one. I will explain the simple steps.
First, I cut some 1/4" plywood to be the base surface. I painted with blue (center of water surface), green (closer to shore), and brown (at shore). When paint was dry, I applied a wash of raw siena acrylic paint (watered down) over the entire surface of the plywood. (This will be the section under the waterfalls.)
Next, I cut a piece from the acrylic light panel. I turned it so it was crinkle side up, and applied a very thin wash of acrylic black paint. I sprayed it with soapy water while paint was still wet. Then, I waited for it to dry about two days.
Next, I turned over the acrylic light panal piece so it was smooth side up. I placed it on the painted plywood.
Next, I installed the “water” on the layout. Basically, it is best to just lay it in place. Scenerey around the edges will keep it from moving.
I suggest you do not make a mistake I made when I tried doing this before. That time, I used clear adhesive in the bottom of the acrlyic panal to hold it to the plywood, and it looked awful. So, this time I just let it lay in place with scenery around the edges.
Various scenery techniques can be used for the surrounding scenery.
I included waterfalls which were made with Woodland