针对老城区内河岸上敷设污水截流干管存在困难的特点，提出河床下敷设截流干管的设计方案及相应的技术措施。
An innovative design in which intercepting main sewers are laid under streambed of a river in an old city is presented with a set of technical measures.
这些街道污水管又相结一条污水支管。此支管与次干管连接，然后经主干管将污水送至污水处理厂。
Several of these flow into a branch sewer, which joins first a sub-main and then a main sewer taking it to the treatment plant.
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