Runoff is an output from a catchment. After fulfilling the requirements for others hydrological process such as infiltration and evapotranspiration, the remaining precipitation becomes runoff and flows out from the catchment. Runoff can be categorized as overland flow, interflow and groundwater runoff. Other than that, we can also group them as either direct runoff or base flow.
Hydrograph is usually developed to aid us in analysis related to runoff. When using an annual hydrograph, we can determine the type of a stream based on the graph pattern. Discharge presents in perennial stream all year long. For intermittent stream, it is expected to dry up during the dry season. As for ephemeral stream, flow only exists when a storm occurs.
As soon as precipitation occurs, it needs to fulfil the requirement for various hydrological processes, such as evapotranspiration and infiltration, as well as detention storage.
The following show some key information about runoff. Watch the video above for full details.
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