BOARD01250

• Board Meeting Date: 12/9/1964
• Description: Minutes
• Board Meetings - Doc Type: Meeting

4J.~.:S

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large area, complex hydrologic interrelations,
and bulk of data, a quantitative evaluation
of the hydrologic system would be extremely
difficult without the use of an analog model.
The model is a tool for analyzing and integrat-
ing the hydrologic data. Ground water, ground
water pumpage, ground water data, surface
water information, and climatologic data will
be programed into the model to simulate the
hydrologic system and to depict present water
management effects on the system. When the
model is refined to the point that it becomes
a true analog of the system, then it can be
used to predict, quantitatively, the effects
of proposed changes in water management. The
model will provide a basis for deciding what
pattern and rate of ground water and surface
water use will be most efficient.

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The l74-mile reach of the Arkansas Valley
from Canon City to the state line will be
modeled. Examples of the maps that we will
use in the construction of the analog model
are displayed here. (Again pointing). I
would like to point out one additional thing
here. This is a schematic drawing of the
Arkansas Valley and it shows what we consider
a normal situation in the Arkansas Valley
where the water table is above the river and
drainage of ground water is toward the river.
The orange line depicts the situation which
exists in some parts of the valley where the
water table has been drawn down by a pump or
a series of pumps so that the flow is reversed.
In other words, the water now goes from the
surface water system into the ground water
system. On this map is shown a section of the
basic framework of the analog model from La
Junta to Las Animas using a scale of 2~ inches
to the mile. The basic framework of the model
consists of the following: the Arkansas River,
shown in blue; the irrigation canals, also shown
in blue; the boundaries of the system - these
boundaries which we are concerned with are the
boundaries between the water range of sand and
gravel deposits and the consolidated bedrock.
That is shown by these dash lines (pointing).