Battle 2 of our 1809 campaign uses a terrain layout that requires 2 different rivers on table. This means that I have to build 2 new river terrain tiles for the game set up. A good time to summarize the build process!
I use 1.5" wide rivers at the edge. Measure from each corner so that the river edges line up evenly. I use a pencil to sketch out the general river course and then score along that sketched line with the utility knife. Starting at an edge, slowly bend the tile at the scored line...then go to the other edge and start there. After a few bends, it will snap off cleanly. Do the other side of the river line similarly.
You now have the two top edges of the tile. Apply a bead of superglue irregularly around the bottom of the top pieces and place on the full bottom tile, aligning on the corner - using your fingers around the corners to make sure they line up.
There you go - you now have the basic river tile. Next up is applying texture to the river. More later.