Fecal coliform concentrations in London sewage is 500,000 MPN/100 mL. A base flow of sewage (q) in the normal intercepti

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Fecal coliform concentrations in London sewage is 500,000MPN/100 mL. A base flow of sewage (q) in the normal interceptingtunnel (Bazalgette’s old system) is 10 m3/s. What size rain eventflow (Q) is necessary to overflow water that meets 14 MPN/100 mL asa primary contact water standard? Assume rainwater fecal coliformis 10 MPN/100 mL. If the catchment producing this rain event is 100km2, what is the rainfall intensity that produces this flow if 80%becomes runoff.