Gordon Couger wrote in message
...

Well I expect I can find any number of then at extension sites in
Texas and
Oklahoma. Rather extensive ones on done to size irrigation systems
once and
then reduced to a look up tables for soil type and crop.

I expect that they world be a forgin to the UK as filling out paper
work on
doctoring calves would be to me.

I am sure that you do some irrigation but the size of them and the
varying
climate and soils you go by expert experiance more than trying to
match all
the equations to you climate that varies by the mile.

All those water budget equations don't take into account the rain fall
anyway so they are only truly valid in the desert. To use them you
have a
number of K factor in them

it did rather strike me that doing one for an area with five feet of
rain was something of a waste of time.


--
Jim Webster

"The pasture of stupidity is unwholesome to mankind"

'Abd-ar-Rahman b. Muhammad b. Khaldun al-Hadrami'

--
Gordon

Gordon Couger
Stillwater, OK
www.couger.com/gcouger