ABSTRACT
The purposes of sewer systems are water pollution control, improvement of sanitation, and flood control. Figure 15.1 systematically shows objectives of operation and maintenance of sewer systems (O&M). Proper operation and maintenance of sewer systems ensures flow capacity in design and structural integrity not only now but also for the future. Without proper O&M, environmental problems such as water pollution, overflow, and odor take place. Furthermore, flying manhole covers, sinkholes, and floods endanger citizens’ life.
