You know those (somewhat) interesting problems about water troughs you slugged through in high school Calculus?
Well, unlike the similar triangles of a whale tale, this problem might actually be of real use. Behold:
It takes about 8ish hours of driving rain to fill this thing. Something I've witnessed twice in less than a year (maybe you've heard of us?). Surprisingly it doesn't overflow the bank (though it will spill into a road upstream). How many parachutes did this civil engineer pack? How many sources feed this thing? What keeps it from overflowing? Is there a bigger outlet upstream? What kind of flow rates are possible? How long after the rain stops would it drain? And biggest of all, just how much water is that?