Chapter
9:
Case
studies
in
Ta’izz
are
charged
more—more
than
$1/m3—if
the
crop
is
qat.
The
fact
that
well-‐owners
sell
at
low
prices
to
neighbours
for
agriculture
and
at
much
higher
prices
for
the
tanker
market
does
seem
to
reflect
the
recognition
of
the
traditional
principles
of
local
cooperation
regarding
water
(Mounch,
2007).
Pollution
due
to
non-‐treated
waste
water
The
population
growth,
municipal
and
industrial
activities
in
Ta'izz
city
have
resulted
in
the
increasing
deterioration
of
the
water
quality,
especially
in
the
shallow
groundwater
aquifer,
which
represents
the
principal
groundwater
resource
in
the
area.
Nearly
5
million
cubic
meters
per
year
of
untreated
wastewater
is
discharged
into
the
basin
system
through
the
septic
tanks,
stream
channels,
sewage
lagoons
and