Key Phrases- River Systems

A positive water balance- Occurs when precipitation exceeds EVT.

A negative water balance- Occurs when EVT exceeds precipitation. 

(Think of balancing scales ^^)

Soil Moisture Surplus- Precipitation is greater than potential evapotranspiration (EVT). Soil water is full, so there is a surplus of soil moisture. 

Soil Moisture Utrilisation- Potential EVT increases and exceeds precipitation. Water is gradually used…