Dr. Ashok L. Lagvankar, P.E., DEE
Total Water Management
Earth Tech., Inc.
Oak Brook, IL
John P. Velon, P.E., DEE
Harza Engineering Company
This chapter presents information on the analysis and design of wastewater and
stormwater piping systems. Wastewater piping systems convey waterborne domes-
tic, commercial, or industrial wastes to a point of discharge and/or treatment.
Such systems are also known as sanitary sewer collection systems. Stormwater
piping systems convey captured stormwater runoff to points of discharge. Such
systems are also known as storm sewer systems. There are systems, chiefly in older
cities, that convey domestic, commercial, and industrial wastewater and storm-
water runoff in a single piping system. Such systems are called combined sewer
The design of both wastewater and stormwater collection systems must comply
with standards of city, county, and state as well as federal regulation agencies.
Permits must be obtained for the disposal of domestic, commercial, and industrial
waste into receiving streams or water bodies. Stormwater discharges to receiving
streams or water bodies may also require permits.
This chapter focuses on public and/or private wastewater and stormwater
collection systems generally serving a number of buildings. For information
about in-building plumbing, which is not covered in this chapter, see Chap. C13 of
this book. The scope of this chapter does not permit examination of appropriate
piping materials for handling exotic wastes such as oils and acids. Refer to the
index of this book for specific information on piping systems to convey such
A selection of terms used in wastewater and stormwater technology follows. Addi-
tional terms are defined at the place of use.
Sewer: A pipe or conduit that carries wastewater or stormwater.
Wastewater: The spent water of a community. From the standpoint of the
source, it may be a co