The storm hydrograph shows variations in a rivers discharge over a short period of time.
River discharge is the volume of water in the river and is measured in cumecs.
Start and finish level = base flow.
As storm water enters the drainage basin the discharge rises causing a rising limb
peak = highest flow in the chanel
receeding limb shows fall in the discharge back to base level
the delay between maxium rain fall and peak discharge is lag time.
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