> Some cities have combined or separated sewer systems.
I wonder how many cities still have a combined system. At least where I live, I could totally see the amount of water coming from the sky regularly beating the amount coming from household drains. Along those lines, our city is spending money replacing private sewer laterals (normally a 10-20K job the homeowner is responsible for) just to cut down on the water intrusion the old laterals (especially party lines) let into the sewer. It's cheaper to pay for the new laterals than it is to build a larger treatment plant.
I wonder how many cities still have a combined system. At least where I live, I could totally see the amount of water coming from the sky regularly beating the amount coming from household drains. Along those lines, our city is spending money replacing private sewer laterals (normally a 10-20K job the homeowner is responsible for) just to cut down on the water intrusion the old laterals (especially party lines) let into the sewer. It's cheaper to pay for the new laterals than it is to build a larger treatment plant.