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Table 4

Summary of the 19 calibration parameters of the SWAT model in the Han River basin

ParameterInput fileUnitsDefault valueRangeDescription
CN2a .mgt – HRU ±20% SCS run off curve number 
ALPHA_BNK .rte day 0.048 0–1 Base flow factor for bank storage 
ESCO .hru – 0.95 0.01–1 Soil evaporation compensation factor 
SOL_BDa .sol mg/m3 Soil data ±50% Soil bulk density 
SOL_Ka .sol mm/h Soil data ±80% Soil saturated infiltration coefficient 
REVAPMN .gw mm 0–1000 Threshold water level in shallow aquifer at which ‘revap’ occurs 
GW_DELAY .gw day 31 0–500 Groundwater delay 
CH_N2 .rte – 0.014 –0.01 to 0.3 Channel Manning coefficient 
CH_K2 .rte mm/h –0.01 to 500 Channel effective hydraulic conductivity 
TIMP .bsn – 0.01 to 1 Snow pack temperature lag factor 
TLAPS .sub °C/km –10 to 0 Temperature lapse rate 
SURLAG .bsn day 1–24 Surface runoff lag time 
LAT_TTIME .rte day 0–180 Lateral flow time 
ALPHA_BF .gw day 0.048 0–1 Base flow recession constant 
SOL_AWCa .sol – Soil data ±20% Available water capacity of the soil layer 
EPCO .hru – 0.01–1 Plant evaporation compensation factor 
GW_REVAP .gw – 0.02 0.02–0.2 Groundwater ‘revap’ coefficient 
CANMX .hru mm 0–100 Maximum canopy storage 
GWQMN .gw mm 0–5000 Threshold water depth in the shallow aquifer for return flow to occur 
ParameterInput fileUnitsDefault valueRangeDescription
CN2a .mgt – HRU ±20% SCS run off curve number 
ALPHA_BNK .rte day 0.048 0–1 Base flow factor for bank storage 
ESCO .hru – 0.95 0.01–1 Soil evaporation compensation factor 
SOL_BDa .sol mg/m3 Soil data ±50% Soil bulk density 
SOL_Ka .sol mm/h Soil data ±80% Soil saturated infiltration coefficient 
REVAPMN .gw mm 0–1000 Threshold water level in shallow aquifer at which ‘revap’ occurs 
GW_DELAY .gw day 31 0–500 Groundwater delay 
CH_N2 .rte – 0.014 –0.01 to 0.3 Channel Manning coefficient 
CH_K2 .rte mm/h –0.01 to 500 Channel effective hydraulic conductivity 
TIMP .bsn – 0.01 to 1 Snow pack temperature lag factor 
TLAPS .sub °C/km –10 to 0 Temperature lapse rate 
SURLAG .bsn day 1–24 Surface runoff lag time 
LAT_TTIME .rte day 0–180 Lateral flow time 
ALPHA_BF .gw day 0.048 0–1 Base flow recession constant 
SOL_AWCa .sol – Soil data ±20% Available water capacity of the soil layer 
EPCO .hru – 0.01–1 Plant evaporation compensation factor 
GW_REVAP .gw – 0.02 0.02–0.2 Groundwater ‘revap’ coefficient 
CANMX .hru mm 0–100 Maximum canopy storage 
GWQMN .gw mm 0–5000 Threshold water depth in the shallow aquifer for return flow to occur 

aThese parameters are varied as a percentage of their default values to maintain their relative spatial variability.

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