Appendix A3.

Range of parameters for HBV hydrology and evapotranspiration (ET) models (Abebe et al. 2010; Huntington and Allen 2010).

Variable	Description	Minimum	Maximum	units
TT	Threshold temperature	−1	1	°C
CFMAX	Degree day factor for snowmelt	1	10	mm/°C day
SFCF	Snowfall correction factor	0	2
CFR	Refreezing coefficient	0	0.1
CWH	Snowpack water retention fraction	0	0.2
FC	Field capacity	100	300	mm
LP	Soil moisture value above which actual ET reaches potential ET	20	100	mm
BETA	Shape coefficient	1	6
PERC	Percolation to groundwater	0	2	mm
UZL	Reservoir threshold	0	100	mm
K0	Recession coefficient	0.05	0.5	1/day
K1	Recession coefficient	0.01	0.3	1/day
K2	Recession coefficient	0.001	0.1	1/day
WP	Permanent wilting point	0	20	mm
Planting Threshold T30	Temperature at which crops are planted	5	12	°C
Killing Frost Temp	Temperature at which frost kills vegetation	−12	−2	°C
Min Growing Season	Minimum crop growing season	100	220	Days
CGDD P to T	Cumulative growing degree days	740	3600	°C days