Frame up. Check.
Tarp laid. Check.
Water in. Check.
One night's worth of freeze. Check.
*What you think is flat is maybe not so flat. Remember, I'm using 2x8s as the frame. On on end, there's about 7" of space between the water and the top of the board, on the other there's about 1". Ruh-roh.
But I decided I would fill until there was water covering the entire tarp. I suppose I could have filled the low end a little bit and let that freeze before filling in the rest so there'd be a base of ice in the deep end. That would probably have been smarter actually. I know there's going to be water under the ice on the deep end much longer than at the shallow end. I also know I may have fated that deep end to not freeze over, ever.
Maybe I can peel off the ice layers as they freeze at the deep end? I don't know.
*When my instant gratification addiction meets the crack dealer of Home Depot, and their blue tarps, hilarity ensues. Yes, I bought the only tarp they had at the store that was my desired size. Yes, there was a lucid thought behind it (I was afraid that if I bought smaller pieces of white sheeting that I wouldn't be able to duct tape (or whatever) them together in a way that would have maintained a necessary amount of water-proofification). But when my neighbor - who used to do a rink when his kids were younger - saw how dark my tarp is he was like "ooh....yeah....uh, that might be a problem." We'll see. I'm living and learning.
*Don't sweat the corners. I was worried about them, but once I got the frame up and the tarp on, when the water came in, there was no problem.
The issue now is the weather. I'm reticent to put any stock in any meteorologist's "forecast" but Accuweather.com is telling me I'm looking at hi/lo splits of 39/32 today, 46/39 tomorrow and 52/32 (with rain) on new year's day. Then it starts to get colder. But I'll be nervous about the ambient temps and the blue tarp conspiring to keep my water from freezing for the next few days.