When only one set of sewers are used to carry both sanitary sewage and storm water, it is called as ______ system.

The treatment is costly in which of the following systems?

Partial sewers carry a part of stormwater to sanitary sewers.

The depth in open drain should preferably be kept ___ the man height.

The increasing flow velocity in water systems not only creates noise but also leads to the wear and tear of the pipes.

What is the maximum velocity of tap water such that the flow causes low noise?

Which of the following is an advantage of separate sewers?

In which kind of cities are combined systems used?