3) Establishing the dynamic input-response relationship
between pollution sources and the position of function zone
In the stage of preparing basic data, it was important to
define the exact function zone and the exact location (discharge
outlet) of each pollution source’s emission. In fact, the
investigation work of this kind of corresponding relation is
very difficult in those areas not having the municipal pipe
system, especially in the Northern China where shortage of
water resources was serious and the artificial ditch cross linked
with the river of function zone both on the ground and
underground. Many pollutant discharging units didn’t know its’
discharge destination by itself, which caused lots of trouble
during the measurement of the water environment capacity.