Runoff equation ( P >Ia)

Description

Surface runoff is the water flow that occurs when the soil is infiltrated to full capacity and excess water from rain. The runoff is depended on the rainfall, the initial amount of water before runoff and the potential maximum soil moisture retention after runoff begins. When the initial amount of water is more than the rainfall the runoff is zero (Q=0)

Related formulas

Variables

QRunoff (m)
PRainfall (m)
IaThe initial abstraction ( the amount of water before runoff) (m)
SMaximum soil moisture retention after runoff begins (m)