Editing Industrial Revolution (section)

====Water and sanitation====
Pre-industrial water supply relied on gravity systems, pumping water was done by water wheels, and wipes were made of wood. Steam-powered pumps and iron pipes allowed widespread piping of water to horse watering troughs and households.<ref name="Hunter_1985" />

Engels' book describes how untreated sewage created awful odours and turned the rivers green in industrial cities. In 1854 [[John Snow]] traced a cholera outbreak in [[Soho]], London to fecal contamination of a public water well by a home [[cesspit]]. Snow's finding that cholera could be spread by contaminated water took years to be accepted, but led to fundamental changes in the design of public water and waste systems.