Larger drainage basins catch more precipitation so have a higher peak discharge. But smaller basins have a smaller lag time as there is a lot less water to drain.
Steep-sided drainage basins have shorter lag times than shallower basins - water flows more quickly increasing peak discharge.
Circular basins are more likely to have a flashy hydrograph than long narrow basins. This is because at watershed is at roughly the same distance away from the point of discharge. This means water reaches measurement point at the samt time increasing discharge.
Basins with a high drainage density drain quickly and have shorter lag times.
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