Why, when modelling a relatively small catchment (2Ha) with an equally short time of concentration (12 mins) does the runoff hydrograph indicate that outflow continues to the 24 hour mark i.e. approx 12 hours after the peak. In fact the runoff volume is also reduced if the time span is set to less than 24 hours. Intuitively the storm event creating maximum peak discharge for such a small catchment would not be responsible for runoff 12 hours later. Is this just an anomaly of the modelling method or is my intuition failing me ?
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