BOARD00531

• Board Meeting Date: 5/7/1969
• Description: Agenda or Table of Contents, Minutes, Memos
• Board Meetings - Doc Type: Meeting

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that it is satisfactory for planning purposes
now. We are not very far off from the point
where it will be useful, not only for plan-
ning but also for month-to-month administra-
tion of the water supply.

This is just an example of the kind of -
input that we can put into the model. We I
can put it in month-by-month just as it occurs
or just as we expect it to occur. Then we
can tell what will happen in the stream it-
self and what will happen to the storage in
the groundwater reservoir. This shows, under
one particular plan of development, what
happens to the flow in the stream. You will
notice that the flow has been reduced from
50 second feet to zero second feet at two
different points. Now by changing the
pumpage pattern, we have raised this zero
up to 20 second feet so we have increased
the supply just by manipulating the pumpage
in the area. We still have the same amount
of water available to the area but we have
manipulated the pump age so now we have met
the demand in a stream for the next ditch
system.

All of this leads to a particular problem
and that is, as we more fully utilize these
supplies and as we manipulate them we are
gradually degrading the water quality. The
most serious area at the present time where
ground water is involved is the Arkansas
Valley again. You can see that as water has
passed through this system, it has leeched
some of the salts out of the area. The
plants use the good water and leave the salts
behind. So the salts become more concen-
trated in the downstream direction. Down
here we have very good water. The water that
actually enters this system is somewhere I
around 500 parts per million. In this reach
it becomes 1000 to 2000 parts per million.
In this reach 2000 to 3000, 3000 to 4000, and
down here it is getting so that nobody really