Excellent!A more to-the-point update: it rained all day yesterday, and I mean real hard rain, not the drizzle that sent the chickens inside sulking before. It seems that they have figured out where the dry areas are, and they remained outside all day! So, we have a lot of progress. I'm feeling hopeful for the winter.
Did you observe water flow off the umbrellas and where it went on the ground?
I often go out with wellies, raincoat, and golf umbrella to check my drain trenches.