Basin Size: Smaller basins, precipitation has less to distance to travel before it reaches the mouth, so there will be a shorter lag time and hydrograph will be shorter and steeper. Opposite for larger basin
Basin Shape: Shorter, rounded basins are more likely to be flashy as the water from the basin tends to arrive more quickly at the mouth. In a thinner basin, water that falls near the source has much further to travel so it will produce a flatter hydrograph
Basin Relief: Steeper basin, under the influence of gravity, water makes its way to the mouth more quickly giving a flashy hydrograph. A less steep basin means water takes longer to arrive at the mouth, giving a flat hydrograph
Soil: Clay soils have smaller pore spaces so don't allow for much infiltration, as a result overland flow is more likely and water reaches channel quicker giving a flashy hydrograph. Opposite for sandy soils
Geology: Basalt is impermeable and less infiltration occurs, flashy hydrograph. Chalk is more permeable so there is more infiltration and a flatter hydrograph
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