Table 1 List of pre-selected SWAT parameters for SUFI-2 calibration and uncertainty assessment in SWAT-CUP. Options to modify parameters is through replacing (r), adding/subtracting (a), and weighing (v)

From: Probable streamflow changes and its associated risk to the water resources of Abuan watershed, Philippines caused by climate change and land use changes

Parameter* Description Unit Initial Adjustment Initial range Final range
r__CN2.mgt SCS curve number Coefficient Increase 0 to 0.5 0 to 0.40
v__ALPHA_BF.gw Baseflow recession constant or groundwater flow response to changes in recharge Coefficient Increase 0.2 to 0.8 0.25 to 0.39
a__GWQMN.gw Depth in shallow aquifer for percolated water to become baseflow mm Decrease − 100 to − 2000 − 0.74 to − 0.54
v__GW_REVAP.gw Water uptake from shallow aquifer to unsaturated zone influenced by roots Coefficient Decrease 0 to 0.4 0.16–0.20
v__ESCO.hru Soil evaporation compensation factor Coefficient Increase 0.6 to 1 0.86 to 1
a__REVAPMN.gw Threshold depth of water in the shallow aquifer for "revap" to occur mm Increase 50 to 300 123 to 201
v__EPCO.hru Plant uptake factor Coefficient Increase 0.5 to 1 0.80 to 1
r__SOL_AWC.sol Available water on the first soil layer Coefficient Decrease − 1 to 0.1 − 0.74 to − 0.44
a__SURLAG.bsn Runoff lag time Hours Increase 5 to 20 8.07 to 12.53
v__CH_K2.rte Effective hydraulic conductivity in main channel alluvium mm/hour Increase 0 to 400 297 to 371
v__CH_N2.rte manning's roughness value for main channel Coefficient Decrease − 0.1 to 0.01 − 0.31–0.25
  1. * SWAT-CUP name label