This chapter discusses how to utilize the output features of VO. By becoming familiar with this chapter, users will find that their modeling time decreases rapidly, as they will find their answers more quickly and efficiently.

Three processes are modelled in Continuous OTTHYMO to calculate water balance.
1. First, precipitation falls on the ground. If a snow pack exists, precipitation will be added for the snow pack water balance simulation.
2. Excess rainfall and snow melt then enter the depression area where it’s lost by ET and infiltration. 2.1. The other excess rainfall and snow melt then goes to the active soil zone.
3. The remaining water is lost to ET and groundwater infiltration. What is left stays in the soil profile or becomes surface runoff.

The precipitation (P) is the input of the system (including rain and snow pack).
Evapotranspiration (including ET_IA_ and ET), surface runoff, and GWI are the output of the system.
The initial amount of water stored in depression storage and the amount of water stored in soil are two components of stored water in the system (ΔS).
The following diagram presents the water balance system in VO.

So, we can say:
P = ET + Runoff + GWI + ΔS