OK, this is fun!
I think I'll leave what I've got for right now. It is GREAT that the drought here is over and I know that I could put in another board or 2 and it would fill up quickly to that level.
We're supposed to get a week's worth of rain starting in the next day or 2 but, I'm not going to try to catch it yet. However, sometime in June our traditionally dry, hot season will start so we may go ahead and try to capture a bit more since evaporation will soon begin to take it's toll on our water level for a few months.