Few human structures alter landscapes as profoundly as dams, according to a new BBC Future series exploring humanity's impact on Earth. By blocking rivers, these giant barriers defy gravity and reshape geological processes, leaving a unique archaeological imprint that could last for millennia.
Dams do more than create reservoirs; they transform river courses, trap silt and sediment, and reduce erosion downstream. Their massive walls and foundations may preserve them as enduring monuments, but they also bring deep changes for local communities, often destroying homes, farmland, and livelihoods.
For instance, earlier this year, an ancient town in Turkey was submerged by rising reservoir waters while the world focused on Covid-19. Future archaeologists may question why such settlements were sacrificed for short-term politics and energy demands.
The effects extend far beyond the dam site. Damming rivers like the Nile can withhold water and power from downstream nations, altering their development trajectories. The series aims to compile a definitive photographic record of how humanity is reshaping the planet, highlighting the stratigraphic and archaeological stories dams write into Earth's history.
