Long-Term Simulation of Daily Streamflow Using Radar Rainfall and the SWAT Model: A Case Study of the Gamcheon Basin of the Nakdong River, Korea

Table 2

Range and input data of the SWAT model parameters.

Variable name	Definition	Range	Input file
GW_DELAY	Groundwater Delay time	0–500	.gw
ALPHA_BF	Baseflow Alpha Factor	0-1	.gw
GW_REVAP	Groundwater “revap” coefficient	0.02–0.2	.gw
GWQMN	Threshold depth of water in the shallow aquifer required for return flow to occur	0–5,000	.gw
REVAPMN	Threshold depth of water in the shallow aquifer for “revap” to occur	0–500	.gw
ESCO	Soil evaporation compensation factor	0.01–1.0	.hru
SLSOIL	Slope length for lateral subsurface flow	0–10	.hru
LET_TIME	Lateral flow travel time	0–10	.hru
LET_SED	Sediment concentration in lateral and groundwater flow	0–10	.hru
CH_K()	Effective hydraulic conductivity in main channel alluvium	−0.01–150	.rte
CH_N()	Manning’s “” value for the main channel	0–0.3	.rte
CN2	SCS Curve Number	30–98	.mgt
SOL_AWC	Available water capacity	0-1	.sol
SOL_K	Saturated hydraulic conductivity	0–2,000	.sol
MSK_CO2	Calibration coefficient used to control the impact of the storage time constant for low flow	0–10	.bsn
SURLAG	Surface runoff lag time	1–24	.bsn
SFTMP	Snowfall temperature	−5–5	.bsn
SMTMP	Snow melt base temperature	−5–5	.bsn
SMFMX	Melt factor for snow on June 21	1.7–6.5	.bsn
SMFMN	Melt factor for snow on December 21	1.7–6.5	.bsn