I did the preliminary work yesterday afternoon.
My phone fell in the water and drowned. Then I fell in the water.
The dam sprung a leak and I plugged it. Then it sprang another leak- by which time I'd done enough for the day.
I went out first thing this morning and plugged the second leak. The soil is very claggy. A single spadeful did the trick.
This isn't the finished article. I need to shift a lot more soil before it looks the way I want it to look.