Stormwater overflow - How do WWTPs manage heavy rainfalls?

The design capacity of wastewater treatment plants is usually based on the connected industries and population equivalent. For example, in Germany the population equivalent per one person and day equals 180l (48gallons/day), 60g BOD, 11g TKN, 70g TSS and 1.8g phosphorus. Then, depending on the expected population and industry growth for the next 30 to 50 years ... 

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