A sewer system is an underground infrastructural facility that is designed to receive storm and sanitary water and safely distribute it within urban areas. The distribution of this water can be accomplished through separate and combined sewer systems. In separate sewer systems, sanitary and stormwater flow through different pipes, while in combined sewer systems, they flow through the same pipe.

In the past, designing a sewer system was a tough and complex task due to all calculations being done by hand. However, with the advancement of technology and computers, numerous software programs have been developed for flow simulation in sewer systems. These software applications can now be utilized to create hydraulic models for planned sewer networks, enabling calculations of pipe dimensions, as well as to assess the flow capacity of existing sewer networks.

The objective of this topic is to assess the flow capacity of the existing sewer network in the city of Bitola using EPASWMM (Storm Water Management Model).