we can come to the conclusion that the core of the WPCTC is
to confirm the input-response relationship between the
pollution sources and the goal of water environmental function
zone. When regarding pollution sources as the input terminus,
it is needed to confirm the water quality’s fluctuation of the
water environmental function zone under the condition of a
given geographical spatial distribution, discharge capacity and
destination of pollution sources. It is important to grasp this
during the course of calculating the water environment capacity.
When regarding water environment goal as the input terminus,
it is needed to assign the limited water environment capacity to
its respondents (each pollutant source) rationally under the
premise of a given specific demand of water quality.