Real hydrological models require catchment geometry, initial moisture, rainfall distribution, channel routing and calibration. Our triangular responses conserve the assigned runoff volume while deliberately simplifying travel times. The comparison teaches why a peak is not the same quantity as a storm total, and it cannot estimate a safe local water level.
Water and oceans · Discover & try
Why can the same rain make a sharper river peak?
Reading level 5 of 5 · AdvancedChange
Word help
Catchment
The land area draining to a shared outlet.
Hydrograph
A graph of flow or water level over time.
Infiltration
Water entering the ground from the surface.
Watch · Try · Explain
See how it works
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Hypothetical, volume-accounted rainfall–runoff curves; not observed river data or a flood forecast.
What to look for
- Compare hydrograph peak with curve area.
- Keep rainfall fixed while changing paved cover.
- Check that runoff plus other water equals rainfall.
Explain what you noticed
Two new catchments send the same total runoff volume to a stream. One delivers it in a much shorter time. Which response is more likely?
Keep this idea: Runoff amount and travel time both shape a river’s response to rain.
Follow the sources
Source material checked 2026-10-28. Explanations and activities by Nepedia. Source links do not imply endorsement.
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