Runoff flowing into a stormwater drain

Surface runoff is the excess water that flows over land when the soil below it is flooded. This is a big part of the water cycle.[1][2] This a prime cause for soil erosion and degradation of soil.

References

  1. Robert E. Horton, The Horton Papers (1933)
  2. Beven, Keith (2004). "Robert E. Horton's perceptual model of infiltration processes". Hydrological Processes. 18 (17): 3447–3460. doi:10.1002/hyp.5740.