These systems safely transport and treat wastewater, dramatically improving public health once widely adopted.

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Sewage Systems: Infrastructure that safely transports and treats wastewater. Source: Sanitary sewer ↗

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04These elevated water-storage structures use gravity to maintain pressure in a distribution network.RECALL
Water Towers
Water towers use gravity to maintain steady water pressure without constant pumping.
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05These systems control water flow and often generate hydroelectric power while creating storage reservoirs.RECALL
Dams
Dams control water flow and often generate hydroelectric power while creating storage reservoirs.
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06These systems carve passageways through earth or rock, enabling routes through mountains or beneath water.RECALL
Tunnels
Tunnels carve passageways through earth or rock, enabling routes through mountains or beneath water.
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