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Re: ?

Mary Jane Hatfield wrote:
> 
> A friend asked me...
> 
> "I had a message from a woman asking for documentation (a
> source to site) for the statements :
> 1- Native prairie soaks up ~12 inches of precipitation/hour ---
> 2- less than 1% of native prairie is left in Iowa
> the number I usually hear is "less than .1 of 1% or less than 1/2 od 1%
> of Iowa's native prairie remains"
> I think how they define native prairie is important in backing the
> numbers-"
> 
> Can anyone be of help?
> 
> Thanks.
> 
> MJ Hatfield
> 
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Water infiltration of native prairies at a rate of 12 inches per hour?

That would depend on the soil type and antecedent moisture condition
when the 12" of water would be poured onto the soil.  I am sceptical
that there are any soils prairie, forest, pasture or other that could
infiltrate 12" of water in an hour possible on deep, level, sands that
are very dry and have no restricted subsoil layers in the soil profile.
The last time 12" of rain fell in an hour Noah built an ark!  12" of
rain
is about a third of the rainfall for a whole year in most of Illinois,
to see that much precipitation in one hour would be a remarkable event
and I doubt the prairies that are left will infiltrate that much water
that fast.

Brett Roberts
State Conservation Agronomist
Natural Resources Conservation Service- USDA

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