Dave, Thank you for the tip on Eric's video. I haven't watched any of his videos for a long time, but those I saw were always very good. I'll look it up. I've read articles on the subject, but don't think I have watched any videos. I am aware, the stuff will find the tiniest hole to go just like water, even though it is much thicker. I'm thinking somehow, you have to do many small pours for a stream with riffles, or no matter where you pour, it will eventually mostly wind up at the lowest point on the streambed; in other words at the temporary dam at the front edge of the layout. 
I won't be getting to that until next winter at the earliest.
I didn't mention what is on my rolling workbench yesterday. I have painted the reinforced walls for the Thomas West Virginia Station kit from Carolina Craftsman Kits. Here is a cropped closer view. After gluing reinforcing stripwood on the backs of the walls and beveling the corner edges, I painted them with acrylic craft paint. I used a more brown color for the first light coat, which I didn't like. I put a thin coat of burgundy on top of that and like the brick color. The mortar joints are so thin, I couldn't get thinned paint to seep in, and it all came off when I wiped the bricks. I have never had success using joint compound for mortar, and thought it would be hard to get it in the paper thin mortar joints anyway. I then used chalk and rubbed it on with my thumb. You can see the section at the top of the photograph needed more chalk wiped off, but I had to get a new rag and left it for the next day. They are now ready for Dullcoat. I thought I had a can, but don't so, I have to buy some of that. In the meantime, I got ahead of myself and started assembling double hung windows. Duh, It would be easier to spray paint them before cutting them out. So, I stopped that too. There are two more panels of doors and windows, since you have to put pieces together for the double hung windows and panel doors. We are supposed to get snow, sleet, and ice tonight and tomorrow morning, so the building is on hold until I can get out. A slight fender bender would total my 18-year old Hyundai! 
So, I plan to wait it out.
