Table 1: Hydrological model calibration: parameters.

ParameterDefault valuesSUFI-2 estimated values
MinMaxNew minNew maxFitted value valuea (sensitivity analysis)

CN257.000b80.000b52.900b73.800b0.000***
ALPHA_BNK0.0001.0000.3561.0740.7150.000***
HRU_SLP0.000b0.400b0.000b0.523b0.005***
Precipitation (Hester Creek)0.000c179.830c0.000c92.250c0.007***
ESCO0.0100.1000.0460.1190.0820.020**
Precipitation (Paint Rock)0.000c152.950c0.000c466.500c0.023**
GW_DELAY0.000500.000−89.328304.328107.5000.034**
RCHRG_DP0.0001.0000.0010.6690.3350.075*
Precipitation (Elk River)0.000c179.320c0.000c542.440c0.182
GWQMN0.0005000.000−2017.7632667.763325.0000.190
EPCO0.0101.000−0.1820.6080.2130.217
SLSUBBSN0.785b109.820b0.720b100.750b0.233
CH_K(2)5.000130.00031.42497.32664.3750.372
ALPHA_BF0.1001.0000.4611.1880.8250.419
REVAPMN0.000500.000105.690369.310237.5000.452
CH_N(2)0.0000.3000.1080.3270.2180.468
GW_REVAP0.0200.1000.0470.1000.0730.698
CANMXd−1.0001.000−0.3570.9370.2900.859
SURLAG0.00020.000−9.27210.2720.5000.925

CN2: initial Soil Conservation Service runoff curve number, function of land use, soil’s permeability, and previous soil water condition; ALPHA_BNK: baseflow alpha factor for bank storage (days); HRU_SLP: average slope steepness (m/m); precipitation: rainfall at monitoring point (mm); ESCO: soil evaporation compensation factor; GW_DELAY: groundwater delay time (days); RCHRG_DP: deep aquifer percolation fraction; GWQMN: threshold dept of water in shallow aquifers (mm H2O); EPCO: plant uptake compensation factor; SLSUBBSN: average slope length (m); CH_K(2): effective hydraulic conductivity (mm/hrs); ALPHA_BF: baseflow alpha factor (days); REVAPMN: threshold dept of shallow aquifers evaporation/deep aquifer percolation (mm H2O); CH_N(2): Manning’s roughness coefficient for channel flow; GW_REVAP: groundwater evaporation coefficient; CANMX: maximum canopy storage (mm H2O); SURLAG: surface runoff lag coefficient. ***99%, **95%, and *90% confidence intervals. aprobability of the t-statistic of the coefficients obtained by regressing the Latin hypercube parameters, generated during the calibration procedure and against the objective function values [23]; bminimum and maximum value of the HRU sample of parameters; cminimum and maximum value of measured and resampled precipitation at monitoring points; dthe fitted value is summed to one and multiplied by the default value (percentage change).