Only 5% of the total population is connected to a sewer network.

It is considered more likely that the stairs gave access to Brighton's sewer network.

No other city in the world has a sewer network like the one found in Paris.

Sanitation activities include the construction of sewer networks and wastewater treatment.

Of the wastewater that enters the sewer network, only about 60% reaches the treatment plants.

I believe they're in the sewer network beneath the forest; that's where we'll look for them.

It has been noted that seven sewer networks drain directly into the river.

It is estimated that 97% of households are connected to the sewer network.

Recently a treatment plant has been completed and the sewer network is being constructed.

A totalitarian sewer network was good for the cause, Fenn supposed.