They decided to move the uphill side of the pipe a little higher on the manhole entrance, so they had to grind the concrete away from the pipe and raise it a couple of inches. They also added concrete to the bottom of the floor to make a deeper groove tor the 'stuff' to flow, and just in case there is a back flow and the manhole starts to fill up, they will slope the part where the ladder is so all the 'stuff' will slip back into the channel, keeping the spot where one might need to stand to stay relatively clean.
The city came out and ran some water down it and the guys said it made a great whirl pool action.
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