I noticed a water bubble on my bedroom ceiling, so I went in the attic
to investigate. It turns out a pipe that vents to the roof had become
disconnected at the first joint, so I just re-connected it. I assume
when it rained hard enough, rain water was leaking down the pipe and
on to the ceiling (we just had a hard rain).
But that got me thinking.. Even if the pipe didn't become
disconnected, should rain water still be leaking down the pipe?
Shhh! If water runs down the inside of the vent pipe, rainwater will enter
the sewer system. This, in turn, will cause extra expense for the sanitary
sewer treatment plant.
Say each house has four of these vents, each 2" in diameter, that's about a
total of 12 square inches of rain capture.
Now in my town, Houston, we get about 48" of rain per year, times 12 sq in
of rain capture per house, that's 4 cubic feet of water that has to be
unnecessarily treated per household per year.
We have about 800,000 households, so the total waste becomes 3,200,000 cubic
feet, or 24 million gallons!
If this comes to the attention of our betters, municipal ordinances will
spring forth mandating rain-dispersing caps on the plumbing vents.
The good news is that these caps shouldn't cost more than $100 per house.
Regarding his real question, any rain water that "leaks" down the vent
just goes into the sewer (as another poster cleverly said). If you
think about, even if it rains an inch, that's not much water compared
to lets say, a toilet flush.
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