Surface Water Theory And Modeling

Water Balance Modelling monthly water balance model for a given period

- If temperature is greater than the base temperature, ranging between 0 and 6 degrees Celsius, then precipitation is rainfall

- Precipitation is rainfall

- Rainfall is added to liquid storage

- Evapotranspiration is calculated using Thornthwaite’s equation

- Evapotranspiration is removed from liquid storage

- Snowmelt is calculated using a degree-day method (Snowmelt=k_sm*(t- t_base)

- Snowmelt is removed from solid storage

-Runoff is proportional to liquid storage (k_rl)

-Runoff is removed from liquid storage

-If temperature is less than base temperature, precipitation is snow

-Precipitation is snowfall

-Snowfall is added to solid storage

-Evaporation is proportional to temperature minus the base temperature, calculated using E=E0+k_es*(t_base-t) (k_es)

-Evapotranspiration is first removed from liquid storage then removed from solid storage

-Runoff is proportional to liquid storage (k_rl)

-Runoff is removed from liquid storage