Inside the pit was
- A newly laid storm sewer line (apparently not working yet)
- A blue pipe bringing stormwater from at least two inlets on Vilas just above the pit, and
- A large concrete pipe with a jagged end leading out and directly to Lake Wingra.
The pit, showing water level before rain starts of 6/5. Pipe on right exits to lake.
When I noticed the pit before rain began, there was a puddle of water in the bottom, with the water's surface several inches below the outlet pipe 3.
About an hour after it started raining, when I returned, water was cascading in several places into the pit along the sides, and a vigorous stream of muddy water was coming in via blue pipe 2. The water's surface in the pit was now substantially above the opening to exit pipe 3, and water was flowing towards the lake. There was now a large plume of muddy water in Lake Wingra, with a vigorous outflow of muddy water from the exit pipe, confirming that this was the destination of the water from the pit.
During the rain, the water in the pit comes up, and exits to the left towards the lake.
I called foreman Todd Timmerman and informed him of the situation about 5:30 pm. He said that he and Tim Troester had gone over the site on Friday, and that Tim had said that everything was OK.
See a slide show of all 6/5 photos here.