Click the Lake/Ocean Tool from the toolbar, and move the camera to where you can see the whole riverbed area. Click four times, building a rectangle around it. The result will look patchy, but you can bring it up by raising the water level.

Click the Lake/Ocean Tool from the toolbar, and move the camera to where you can see the whole riverbed area. Click four times, building a rectangle around it. The result will look patchy, but you can bring it up by raising the water level.
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Leave most of the other settings for now - you can come back and play with them later. The water will cut through anything, so make sure it’s got the space - and it’ll be transparent, so put something underneath.
