Before calibrating the model, the sensitivity analysis was performed to identify the sensitive parameters with a global sensitivity analysis method using the SUFI-2 algorithm (part of the SWAT-CUP tool). Out of several parameters, 18 were selected (shown in Table 7) for streamflow simulation based on other literature for the study region (Setti et al. 2020a, 2020b). The model was calibrated at daily and monthly time scales; at each scale, 18 parameters were used for model calibration.
Hydrological parameters used during sensitive analysis and their description
| Sl.No . | Parameters . | Description . |
|---|---|---|
| 1 | RCHRG_DP | Deep aquifer percolation fraction |
| 2 | ESCO | Soil evaporation compensation factor |
| 3 | SOL_K | Soil hydraulic conductivity (mm/hr) |
| 4 | SOL_AWC | Available water capacity of the soil layer (mm) |
| 5 | CN2 | Curve number |
| 6 | LAT_TTIME | Lateral flow travel time (days) |
| 7 | GW_DELAY | Groundwater delay (days) |
| 8 | CH_N2 | Manning's ‘n’ value for the main channel |
| 9 | SLSUBBSN | Average slope length (m) |
| 10 | HRU_SLP | Average slope steepness (m/m) |
| 11 | EPCO | Plant evaporation compensation factor |
| 12 | CH_K2 | Hydraulic conductivity of main channel (mm/hr) |
| 13 | GW_REVAP | Groundwater recap coefficient |
| 14 | GWQMN | Threshold depth of water in the shallow aquifer (mm) |
| 15 | ALPHA_BF | Baseflow alpha factor (days) |
| 16 | REVAPMN | Threshold depth of water in the shallow aquifer for recap to occur (mm) |
| 17 | OV_N | Manning's ‘n’ value for overland flow |
| 18 | SURLAG | Surface runoff lag time |
| Sl.No . | Parameters . | Description . |
|---|---|---|
| 1 | RCHRG_DP | Deep aquifer percolation fraction |
| 2 | ESCO | Soil evaporation compensation factor |
| 3 | SOL_K | Soil hydraulic conductivity (mm/hr) |
| 4 | SOL_AWC | Available water capacity of the soil layer (mm) |
| 5 | CN2 | Curve number |
| 6 | LAT_TTIME | Lateral flow travel time (days) |
| 7 | GW_DELAY | Groundwater delay (days) |
| 8 | CH_N2 | Manning's ‘n’ value for the main channel |
| 9 | SLSUBBSN | Average slope length (m) |
| 10 | HRU_SLP | Average slope steepness (m/m) |
| 11 | EPCO | Plant evaporation compensation factor |
| 12 | CH_K2 | Hydraulic conductivity of main channel (mm/hr) |
| 13 | GW_REVAP | Groundwater recap coefficient |
| 14 | GWQMN | Threshold depth of water in the shallow aquifer (mm) |
| 15 | ALPHA_BF | Baseflow alpha factor (days) |
| 16 | REVAPMN | Threshold depth of water in the shallow aquifer for recap to occur (mm) |
| 17 | OV_N | Manning's ‘n’ value for overland flow |
| 18 | SURLAG | Surface runoff lag time |