On 3/31/2010 10:12 AM, Dr Skip wrote:
>> One time we had
>> everyone flush their toilets at the same time.  It took 20 minutes for the
>> water pressure to come back to the top floors.
>
> Johnny Carson (or was it Letterman?) suggested this on TV 30yrs ago or so.
> Interesting to think about on a community or national level... I was talking to
> a sewage plant mgr one time and mentioned that show and he remembered. He said
> that if even a decent fraction of the city did that there'd be a major sewage
> 'event' to be cleaned up...
>

Happens all the time.  The water pressure gauges on any US cities water 
supply system give perfectly accurate accounting the time and duration 
of TV commercials during such events as the Super Bowl.
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