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patterns for the Bay Region.
The system wns first set up using data taken from a
survey by Xunting Technical Services, 1982. This
survey "aappedW t3e region into twenty nine "stratatv,
saeb stratun representing an area which was found to
be statistically h~nogeneous- The original map is
reproduced in Figure 2-2.3. The data was then
transcribed to z computer spreadsheet, with each entry
representing the stratum cade far a five kilometer
square. The resulting %ap* is shown in Figure 2,2.4.
wCellsH containing zeroes are those which lie outside
the Bay 2egion. The co-ordinates used are the U W
grid zone designations in kilometers: this system was
found to 5e easier to work with than the conventional
hours-minutes-seconds system. Statistics for the
densities af houses and animals were then entered far
all stratum codes. From these, the actual number of
houses and aaimals for each 25 sq-km. grid can be
shown in place of the stratum cade.
When more extensive data became available from the
Southern Rangelands Survey, 1995, the system was
revised to a I6 sq-km. grid. This survey used 176
stratum codes, and produced statistics for bath the
wet and dry seasons. A new *'mapw was created from
this data. The system was also redesigned to allow
the co-ordinates of specific sites to be input, and
for these to be "platted1* on a blank mapt An example
is shown in Figure 2.2.5,
Not only the populations of cattle can be shown, as
in figcre 2.2.6., but using the human popularion
fiqures computed from the density of houses, and the
populations of all types of animals, various estimates
of the Cemand for water throughout the region can be
Fsttern cf denape
calculated. Figure 2.2,7. shows ~??e
.- - high &stirnates consuxption: each figure
represents the total estinated demand per day within a
16 sq.km. area, in cubic meters, during the dry
season. Csing low estimates of per capita
consumption, the demznd throughout the region is shown
in Figure 2.2.8.
A more specific profife of an area czn be extracted as
shown in Figure 2.2,9. The location of the village in
this example, Tur Demerre, is shown in Figure 2.2.10
to be part of a narrow belt of stratum 44 stretching
from the northeast. Strata 44 and 45 are to the
northwest: stratum 61, and beyfind it, 71, are to the