Soil-Water Balance Model
Evaporation based on Temperature
Runoff based on Precipitation and WHC
Notes:
Soil-water balance is an accounting procedure for near-surface soil-moisture
It is included in a class of models known as “bucket” models
- properties are averaged for each drainage basin
- for example, a watershed has a single water holding capacity
Changes in soil moisture are calculated using a mass balance
- historical precipitation is known
- evaporation is estimated using the temperature-based Hargreaves equation
- runoff is dependent upon soil moisture and precipitation
Side note: the Nueces River Basin has the highest stream flows; as a result, it contributes around 60% of the total recharge to the Edwards Aquifer