Water balance outputs across tools

Flux or storage	Tool output and/or calculation approach
	WRSM (Sami GW)	SPATSIM (Hughes GW)	ACRU (ACRU4)	SWAT (ArcSWAT2012)	MIKE-SHE semi-distributed	MIKE-SHE fully distributed
AET total
Output (Y/N)	no*	no*	no*	no*	yes	yes
	calculate: long term ave: precip. - runoff – Δ soil storage - Δ GW storage (not monthly due to lags)	calculate: ET output (includes canopy interception) + AET from GW (external calculation)	calculate: canopy evap. + AET from soil	calculate: AET from soil + AET from GW		(includes evaporation from surface ponding)
Output scale	(runoff module)	(subcatchment)	(HRU)	(HRU)	grid cell, polygon, catchment	grid cell, polygon, catchment
Canopy int. evaporation
Output (Y/N)	no#	yes	yes	no	yes	yes
Output scale		subcatchment	HRU		grid cell, polygon, catchment	grid cell, polygon, catchment
AET from soil
Output (Y/N)	no #	yes	yes	yes	yes *	yes *
Output scale		subcatchment	HRU	HRU, subcatchment, & catchment	grid cell, polygon, catchment	grid cell, polygon, catchment
AET from GW
Output (Y/N)	no #	no	(n/a)	yes	yes	yes *
		calculate: algorithm		(‘Revap’)
Output scale		subcatchment		HRU	subcatchment aquifer & catchment	grid cell, polygon, catchment, aquifer layer or all
Runoff (RO) total
Output (Y/N)	yes	yes	yes	yes	yes	yes
Output scale	runoff module & route (any scale)	subcatchment	HRU, subcatchment, & catchment.	HRU, subcatchment, & catchment	river cross section	river cross section
Surface runoff
Output (Y/N)	no **	yes	no	yes	yes *	yes *
	calculate: RO total – interflow – aquifer RO		calculate: “Quickflow” – “DelayedStormflow”
Output scale	runoff module	subcatchment	HRU	HRU, subcatchment, & catchment	grid cell, polygon, catchment	grid cell, polygon, catchment
Interflow
Output (Y/N)	yes	yes	yes %	yes	yes	yes *
		(‘soil moisture runoff’)	(‘DelayedStormflow’)	(‘Lateral Q’)		(saturated zone upper layer)
Output scale	runoff module	subcatchment	HRU	HRU, subcatchment, & catchment.	subcatchment interflow reservoir	grid cell, polygon, catchment
Aquifer to channel
Output (Y/N)	yes	yes	yes	yes	yes	yes *
			(‘Baseflow’)
Output scale	runoff module	subcatchment	HRU & subcatchment	HRU, subcatchment, & catchment.	subcatchment aquifer & catchment	grid cell, polygon, catchment, aquifer layer or all
Aquifer GW flow in/out
Output (Y/N)	no	yes	no	no	no	yes *
Output scale		subcatchment				grid cell, polygon, catchment
Soil profile storage
Output (Y/N)	yes	yes	yes	yes	yes *	yes *
Output scale	runoff module	subcatchment	soil layer in HRU	HRU, subcatchment, & catchment.	grid cell, polygon, catchment	grid cell, polygon, catchment
Aquifer storage
Output (Y/N)	yes	no #	yes	yes	yes	yes *
Output scale	runoff module		HRU	HRU & subcatchment	subcatchment aquifer & catchment	grid cell, polygon, catchment, aquifer layer or all
Percolation out of soil storage
Output (Y/N)	yes	yes	yes	yes	yes *	yes *
	(‘total recharge’)	(same as recharge)	(same as recharge)
Output scale	runoff module	subcatchment	HRU	HRU, subcatchment, & catchment.	grid cell, polygon, catchment	grid cell, polygon, catchment
Aquifer recharge
Output (Y/N)	yes (‘aquifer recharge’)	yes	yes	yes	yes	yes *
			( ‘SaturatedFlow’ B horizon + ‘UnsaturatedFlow’ if option to include is selected)
Output scale	runoff module	subcatchment	HRU	HRU & subcatchment	subcatchment aquifer & catchment	grid cell, polygon, catchment, aquifer layer or all