|I was wondering is a large amount of rainfall
effects the density of a small body of water? For
example if it rains a lot in a pond will the
density change or stay the same? |
|Question Date: 2005-03-20|
If the pond is fresh water and the rain is fresh
water, the density should not change. If the rain
and pond are very different temperatures, I guess
the density would change a bit, but the effect is
really not very noticeable. However, if rain
water runs off into the ocean, it is less dense
and it "floats" on top of the salt water. This
can cause significant local effects in coastal
places where is rains a lot (like the west coast
of New Zealand).
Most ponds are fresh water, and rainfall is fresh
water, so they would have the same density.[What
is the density of fresh water?] Little salty
ponds or puddles near the ocean might get less
dense with a big rainstorm. Actually, I think the
rain storm would probably wash out the sand
between the little pond and the ocean. You could
think about rainfall vs the average depth of a
salty [or "brackish"] pond. If there was an inch
of rainfall and the pond was 6 ft deep on the
average, how much would the salt concentration in
the pond change?
I imagine that rain does change the average
density of a pond by some amount as rain water is
probably more pure then pond water. I'm not sure
at what point the change would be measurable
though. Also, a lot more rain water will get into
a pond from run-off then from directly falling
into the pond, but run-off would also tend to
carry some dirt with it as it runs into the pond.
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