A few splashes?
So our company does environmental monitoring systems, amongst other stuff. We had an entertaining time a year or three back in central london when one of our sites had a bit of a problem with water. We were only paid to record and monitor, not to tell anyone, so these made fun reading back on the monday.
B3 leak detection alert
Tank 1 overspill alert.
Tank 2 overspill alert
Sump pump 1 failed.
Sump pump 2 failed.
B2 Leak detection alert
all hell breaks loose with alerts of all sorts
all alerts stop
Night shift guard is heading through basement on patrols and notices floor is an inch deep in water, and the steps down have vanished.
Starts frantically calling everyone.
It is determined that the taps are controlled from an area two floors down. Underwater.
Fire brigade turns up to assist, soon determines that water is lapping at the plinth of the local substation in the basement. Phones electric company hotline.
According to our contact the call went something along the lines of :
"Turn off the substation at xxx"
"Are you crazy, that powers safety critical traffic lights and half of regent street and soho, not happening"
"Turn it off, or in ten minutes I'll make it go off with my axe, or in half an hour the water will make it explode, I'll put the fire out, and it will still be off"
"oh. um. I need to speak to ... "
<2 min later power goes off>
"Erm, it should be off"
Turned out that a 6bar mains head had sheared off in the basement, so the normal firetrucks couldn't keep up with demand - they had to bring in a serious pump truck at £1000/hr, which they made our contact sign off for on the basis that he knew why they were there. Took em some 14 hours to pump the basements dry after cutting off water supply to the area.
Our kit turned out to have been sending alerts for nearly three hours while underwater, which we reckoned was a pretty good stress test.