These methods represent the flux of heat across the reservoir surface. It is used as a heat source or sink for the upper layer(s) of the reservoir model.

This is the default method, and is not a valid method for calculation. An error is flagged if this method is executed.

The flux method determines the flux from incoming solar radiation, incoming longwave radiation, outgoing radiation from the reservoir, outgoing heat due to conduction, and outgoing heat due to evaporation.

This method requires a current epilimnion temperature which is a column of the Temperature Agg Series Slot.

The method calculates the surface flux as follows (each variable represents a utility method described below):