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DRAINAGE BASISN - Coggle Diagram

- - - - ▪ Deforestation, tree felling and slash-and-burn - Soil becomes exposed and roots are lost (which bind the soil together), which leads to more soil erosion and so more surface runoff.
      - ▪ Impermeable surfaces – As more tarmac and concrete is laid, less infiltration into the topsoil can occur, and so more surface runoff occurs.
      - ▪ Bridges can act as dams for rivers, restricting channel flow (especially storm flow) and increasing the pressure the river’s water is under, therefore worsening flood impacts.
      - ▪ Drainage and sewage systems will reduce lag time, and so a quick flow of water back to rivers, increasing the risk of flash flooding.