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                    Description of the region

     The example region under consideration is  a  basin  of  the
River which takes it source from the Lotov Lake and runs into the
Sea. The lake has two inlets and the River has the same number of
inlets.  The  water  flow  from  the  Lotov  Lake to the River is
regulated by the dam.  The Lotov Lake  serves  as  the  municipal
water  supply  source.  Moreover,  the Lotov Lake is an important
ecological and recreational unit (see the map inside the game).

     The agricultural (here grain-crops) production in the region
has an impact on the environmental situation.  It is  related  to
the  fact  that the application of chemical fertilizers and water
for irrigation can substantially increase grain-crops output. But
at  the  same time irrigation and chemical fertilizers can result
in negative environmental  consequences.  Part  of  the  chemical
fertilizers finds its way into the River (or into its inlet) with
the withdrawal of water.  Periodically a shortage  of  water  may
arise.  Irrigation is used during the dry season,  when a natural
drop in the water level in  the  Lotov  Lake  occurs.  Irrigation
causes an additional shortage of water.

     Two agricultural zones exist.  In the upper zone  irrigation
and  fertilizer  application  can  result in a direct drop of the
water level in the Lotov Lake and the pollution of its water. But
irrigation  and fertilizer application in the lower zone also has
an influence on the Lotov Lake in an indirect form.  There  is  a
water monitoring point "A" near the mouth of the River, where the
water flow and pollution concentration are checked.  Restrictions
on  the  water  flow and pollution concentration levels have been
set.  For that reason irrigation and fertilizers  application  in
the  lower  zone may result in the additional water flow from the
Lotov  Lake  into  the  River  to  fulfill  the  requirements  of
pollution control.
