(a) Cement concrete pipe is usually less costly than vitrified
pipe.
(b) It can be formed in any shape desired.
(c) It is not cracked by vibration, and resists impact better than
vitrified pipe, for which reason it is a better material to
lay near the surface of a street in which there is heavy
traffic.
(d) It is not affected by ordinary sewage.
(e) The cost of repairing and maintaining is about the same as for
a vitrified pipe sewer.
(f) It can be made in the city or town where it is to be
installed, thus giving the locality the advantage of having
some of the money paid for labor in its manufacture spent in
the place where the sewers are being put in, where it is
raised as a tax, etc.; also saving freight charges, etc.
(g) It can be made under the most careful local supervision and
inspection, of selected material, by the engineer who is
responsible for the success of the work. Vitrified pipe can
seldom be made in this way.