Agriculture Reference
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thereafter, these reserves will have priority over any other use until such a
security level is reached. Once this limit has been exceeded,
additional units of water will be kept in the reservoir only if all the other
uses are satisfied. These variables,
their
spatial location and time
distribution are presented in Figure 11.2.
2.3 The model
Farmers cultivate a mixture of
i
different products (
i = 1, 2, , n
) with net
profits per unit of surface area (with the cost of water also being
discounted) of surface areas per crop of and applied water for each
crop and irrigated area of (which, in turn, depends on the water needs
of the crop and the irrigation efficiency (
e
)
.
With respect to the hydropower plant, the profit also depends on its
unit margin on the released flow on a conversion independent
of these factors in energy, which we denote as and on the head of water
in the reservoir which, in turn, depends on the volume stored in the
reservoir The margin corresponds to the profit obtained by
the last unit of energy (Kwh) produced.
The restrictions reflect the two aspects we consider to be essential,
that is to say, the water right system and spatial location, with the first of
these establishing the order of priority, the allotment and the moment in
time at which the use becomes effective.
In function of these criteria and of the places of diversion, we have
two possible relationships between the uses: rival and successive (or non -
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