Factors influencing storm hydrographs

Factors influencing Storm Hydrographs

Area

• Large basins receive more precipitation than small therefore have larger runoff.
• Larger size means larger lag time as water has a larger distance to travel to reach the trunk river.

Shape

•  Elongated basin will produce a lower peak flow and larger lag time than a circular one of the same size.

Slope

• Chanel flow can be faster down a steep slope therefore steeper rising limb and shorter lag time.

Rock Type

•  Permeable rocks mean rapid infiltration and little overland flow therefore shallow rising limb.

Soil

• Infiltration is generally greater in thick soil, although less porous…