Phosphorus in the Shallow Aquifer

Groundwater flow entering the main channel from the shallow aquifer can contain soluble phosphorus. With SWAT+ the soluble phosphorus pool in the shallow aquifer is not directly modeled. However, a concentration of soluble phosphorus in the shallow aquifer and groundwater flow can be specified to account for loadings of phosphorus with groundwater. This concentration remains constant throughout the simulation period.

Table 3:2-5: SWAT+ input variables that pertain to phosphorus in groundwater.

Variable Name	Definition	Input File
GWSOLP	Soluble phosphorus concentration in groundwater flow (mg P/L)	.gw