The estimation of wastewater flows is a fundamental requirement in thedesign of successful wastewater systems. The sizes and capacities of allmajor components are dependant on the predicted amount of wastewaterflow that will originate from the contributory areas within the proposedcatchment.The reliability of flow estimates depends on the accuracy of manyassumptions. These include the future water demand and resultantwastewater production, population growth or decline, population densityvariations, socioeconomic changes, land use changes, and the maintenanceof the wastewater system infrastructure. It is essential that the wastewatersystem has adequate capacity for peak wet weather flow, but can alsofunction satisfactorily at minimum flows without operational problems(Great Lakes Upper Mississippi River Board of State Sanitary Engineers1978, p. 12).The Colombo formulae (1) and (2), is a theoretically derived formula usedto predict peak wet weather flow in separate wastewater systems. Thisformula has been by Melbourne Metropolitan Board of Works and SydneyMetropolitan Board of Works since the late 1960s (Coulsen, J 2004, pers.comm., 15 June), and is currently used at Gippsland Water. -- Complete abstract not reproduced here: see main document for complete abstract.
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