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(a) Give short notes of two basic types of sewerage system for collection of wastewater and surface water from built-up areas.

(b) Many countries have included wastewater reuse as an important dimension of water resources planning and as a requirement knowing the properties of the sewage is very important. Explain these properties and provide three examples of parameters involved in each case.

(c) Critically show the two types of wastewater pollutants: conservative and non-conservative, which help in deciding the treatment system and prevention measures.

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