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Letort Vanessa Student Number: 2029474 Module: HEV 4031 Dr Huw Jones or Prof. Bryan Ellis WATER QUALITY MODELLING QUALSOC APPLICATION INTRODUCTION Precipitation that accumulates in natural or constructed storage and stormwater systems during and immediately following a storm event, are described as stormwaters. The earliest sewer systems were designed to carry both sewage and stormwater to the treatment plant simultaneously (combined sewer overflows, CSOs) (Porteous, 2000). In a combined sewer area, the maximum capacity of the sewer system can be exceeded during a storm. The design of the sewer system allows the excess of water to overflow directly into bodies of water without treatment, this way the excess of water does not overflow by domestic appliances (toilets, sinks and so on). Figure 1 schematises the paths of different waste waters from an urban area as well as stormwater and displays the representation of CSOs and separate sewer systems. Figure 1: Separate sewer systems and combined sewer systems...

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