OK, I made up that bit about the thousand cubic yards, but the rest is broadly true. My ride today took me along this canal, which has been undergoing a major renovation for some time - the leaks in the sides are being fixed and all the muck in the bottom is being scraped up and hauled away.
I got to this point and got a whiff of what they were digging out. I had to stop and take a photo as a reminder - it was pure eau de dog poop. A front end loader like the one in this picture has been digging this crap out day after day for months - it has taken them all year to scrape up the goop over a 500 metre stretch, and there is a long way to go.
Next time you see a dog owner failing to pick up their dog's crap, you know where that will end up. In a layer about two feet thick in a canal like this.