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Human interference in the hydrological cycle

Short answer

Humans alter precipitation via cloud seeding and climate change; increase evaporation from reservoirs and irrigation; reduce infiltration with pavements, increasing runoff and flood peaks; regulate surface flows with dams and embankments; deplete groundwater by pumping; and pollute water and increase sediment through land clearing and mining.

Explain briefly humankind's interference in various parts of hydrological cycle.

Human activity changes many parts of the hydrologic cycle:

  • Precipitation: Cloud seeding for rain, and climate change from greenhouse gases and urban heat change rainfall patterns.
  • Evaporation and transpiration: Reservoirs and irrigation raise evaporation; deforestation lowers transpiration; planting forests raises it.
  • Interception and infiltration: Roads, roofs and pavements reduce infiltration and raise runoff and flood peaks; agriculture and terracing may increase infiltration.
  • Surface runoff: Dams and barrages store and regulate flow; embankments and river training change flood patterns; urbanisation shortens time of concentration.
  • Groundwater: Heavy pumping lowers the water table, while artificial recharge and irrigation seepage raise it.
  • Water quality: Sewage, industry and fertilisers pollute surface and groundwater.
  • Sediment: Land clearing and mining increase erosion and siltation of reservoirs.

✓ Answer checked by Claude Sonnet 5.5

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