Runoff generation

4 important questions on Runoff generation

What are the different contributions/components to runoff generation (or river discharge)Do these processes operate at different timescales?

  • Surface runoff/overland flow
  • Interflow/shallow subsurface flow (unsaturated zone)
  • Baseflow/groundwater discharge (saturated zone)
  • Precipitation onto stream

When does a precipitation event lead to overland flow?

If water does not infiltrate into the ground, it accumulates at the surface
→ creates overland flow

What is the infiltration capacity?
Under which conditions do rainfall rates exceed the infiltration capacity?

Maximum rate of infiltration
→ varies with soil composition and initial conditions

Infiltration excess
→ rainfall intensity exceed maximum infiltration rate
→ impermeable surfaces

Saturation excess
→ soil is saturated with water and can not store more water


→ overland flow
  • Higher grades + faster learning
  • Never study anything twice
  • 100% sure, 100% understanding
Discover Study Smart

How does land-use affect the infiltration capacity of the ground?Hydrological response to a precipitation event (quickflow vs baseflow)

Impermeable surfaces (concrete, asphalt) reduce infiltration capacity

Quickflow: Water that does not infiltrate, accumulates at/runs over the surface

The question on the page originate from the summary of the following study material:

  • A unique study and practice tool
  • Never study anything twice again
  • Get the grades you hope for
  • 100% sure, 100% understanding
Remember faster, study better. Scientifically proven.
Trustpilot Logo