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WC10 - Hydrographs, key:
for a flashy hydrograph 2. low flat hydrograpgh…
WC10 - Hydrographs
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Parts of a hydrograph
fall limb
The part of the graph after peak discharge. discharge is decreasing as less water is flowing into the river. A shallow falling limb shows water is flowing in from stores long after its stopped raining.
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peak discahrge
The highest point on the graph, when the river discharge is at its greatest
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lag time
The delay between peak rainfall and peak discharge, this happens because it takes time for the rainwater to flow into the river. a shorter lag time can increase peak discharge because more water reaches the river during a shorter period of time.
Overland flow
Water flowing to the channel over the land's surface, and reaches the channel quickest. This might be because the ground is impermeable or the precipitation cannot infiltrate quick enough
rising limb
the part of the graph up to peak discharge, the river discharge increasing as rainwater flows into the river.
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Hydrograph
Graphs of river discharge over time. They show how the volume of water flowing at a certain point in the river changes over a period of time.
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key:
- for a flashy hydrograph 2. low flat hydrograpgh