The wastewater from water used indoors, including steam, that is piped away to a sewage treatment plant.
Sewage from people = wastewater * proportion of wastewater piped
Used to calculate: impervious runoff from hardtops, pervious runoff from soil, leaky pipes, biodegradable liquid waste, non-biodegradable liquid waste and runoff from people (sewage)
Depends upon:
—Parameters: proportion of wastewater piped and steam pipe leakage
—Other metrics: water used inside and water used making steam