Water Cop Policy Draft

Material Information

Water Cop Policy Draft


Subjects / Keywords:
Crops ( jstor )
Water tables ( jstor )
Water flow ( jstor )
Spatial Coverage:
North America -- United States of America -- Florida


Water Cop Policy Draft
General Note:
Box 10, Folder 12 ( SF Water Rights-Water Crop - 1973, 1976-77 ), Item 41
Digitized by the Legal Technology Institute in the Levin College of Law at the University of Florida.

Record Information

Source Institution:
Levin College of Law, University of Florida
Holding Location:
Levin College of Law, University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.


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General Comments

Water Crop is defined to be the- precipitation (P) minus the
evapotranspiration (eT).
Reference: Water Supply Paper, 1541-A, page 21.
We = P eT

Water crop must maintain all consumptive uses and streanflow or
reduction in water in storage will result.

The enviornmental dependency of a given area upon high water-table
levels will vary widely.

Pine and oak trees and some grasses will not suffer drastically if
the water table is lowered a few feet below that historically
found beneath these vegetation types.

In contrast lake and swamp areas which experience the same magni-
tude of water table lowering will experience a transition of
vegetation types. An effective reduction in the drainage area
maintaining the lakes and swamps will result and lowered levels
will result unless heavily augmented by diversion of runoff
and/or wells.

A number of factors must be considered when attempting to apply the
water crop theory to a large diverse area.

1) Although precipitation is the source of all water in the ground
and surface water systems, varying degrees of interconnection
between them and internally within each, develops extremely complex
individual site conditions.

2) A site area which is characterized by sluggish surface drainage,
high water table, effective confining layer and moderate to high
artesian transmissivities is unlikely to be capable of yielding the
water crop through development of the artesian aquifer.

3) A site area which is characterized by large amounts of depression
storage, moderately high water table, sluggish surface drainage, ah
intermittently effective confining layer and moderate artesian
transmissivity is likely to be capable of yielding more than the
water crop through development of the artesian aquifer.

4) Due to the hydraulics involved in a well's construction and the
stratification within the carbonate section, the writer believes
that certain sites do develop a significant portion of their
yield from regional flow even though they may have very leaky
conditions across the upper boundary of the artesian system.

5) A site area which might be characterized as having a high artesian
transmissivity and an initially effective confining layer can pro-
duce significant deterrents to high capacity development. Due to
the effective confining layer, head differences between the water
table and the artesian systems can become quite high and still
not induce the water crop to flow from the water table into the
artesian member, but, it can cause a rupture of various points in
the confining layer where the layer is thin and shear strength is
low. The resultant development of sink holes will increase recharge
slightly, but, perhaps more importantly will create avenues for
sources of pollution as such holes are often filled with materials
which would most properly be classified as wastes.

6) Aquifer characteristics are not exactly constants but are
relatively stable if ac ur tely determined. The models upon which
all test determinations -l~j asedare very generalized and theoret-
ical and require a uniformity no-Tround in nature, ei.o- en. The
eq hydraulic impact tflsuch models a)kgeared to vie *at constant
ratesor completely stable, conditions; these as a practical matter
do not exist-eithe% Ae teAst conditions cannot be met, -thn.
interpolations to compensate for the variance from ideal conditions
must be made as well as between various partially applicable models.
It is somewhat of an art not an exact science.

7) The most certain effects of over development appear to be
salt-water encroachment, water-table decline and streanflow. The
management of the water crop must rely heavily on excellent monitor
systems of these conditions to insure 1the 2b.1 M development is
maintained. & **^^Cd

8) Although the writer and others have stated and/or implied that
the development of the water crop from each square mile is "whatever",
it is my considered opinion that the only effective water crop
management must be based on units comprising many square miles.
This will be necessary in order to manage stream flow as it can not
be managed on small areas of control.

9) The management and control of water resources in the District
should undergo three tests:
a) Does the proposed/existing development of water exceed
that which is available from P eT?

b) Does the proposed/existing development of water create a
.positive potential for water quality degrad tion? Does an
-7 avenue exist along which that potential~ P lt in quality

c) Does the combined development for the water resource
-basin exceed the water crop if the proposed development is
placed in operation?

10) To manage the Water Crop, "water use areas" will have to desig-
nated. lll hLl-^. i-i -). A -LiiU411LA I

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