Why don't we do this?

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Bureaucracy.

Looks like a wonderful solution until your toilet starts overflowing

Because in reality most people don't care. It's just a problem to have something to talk about.

That solution blocks off fish species' ability to travel the river and spawn. It fucks up the ecosystem's fauna.

>Why don't we do this?

Why would we kid?. What do I care about water and sewage. It's the public and government's problem, not my businesses.

I wouldn't want to be the one that gets to change the whole city's poop sock.

it's a drainage ditch

It's your money being used ineffectiely so you should care

Flow rate problems