Basic Principles in the Design of Sewer Systems

A sanitary sewer or foul sewer is an underground pipe or tunnel system for transporting sewage from houses and commercial buildings (but not stormwater) to treatment facilities or disposal. Sanitary sewers are part of an overall system called a sewage system or sewerage. Link for full presentation

Sewage may be treated to control water pollution before discharge to surface waters. Sanitary sewers serving industrial areas also carry industrial wastewater.

Separate sanitary sewer systems are designed to transport sewage alone. In municipalities served by sanitary sewers, separate storm drains may convey surface runoff directly to surface waters. Sanitary sewers are distinguished from combined sewers, which combine sewage with stormwater runoff in one pipe. Sanitary sewer systems are beneficial because they avoid combined sewer overflows.

 A presentation made to the Nigerian Institution of Mechanical Engineers Abuja Chapter on 25th May 2020. Download here

Design of Water Reticulation Systems

The steps in design of any water system include

  1. get a map of the are
  2. get a cordinate or topo map of the area
  3. get the land use arrangement or layout
  4. determine the density of population of the area using any available method
  5. get the RoW or road layout of the area
  6. determine the total water deman or expected flow
  7. design the distribution network
  8. determine the pipe sizes
  9. determine the tank sizes
  10. detail your drawing
  11. submit your drawing for review and analysis