Process

APEX

SWAT

SWAT+

Runoff

­ Runoff CN initial abstraction (PARM20)

­ CN retention coefficient (PARM92)

­ Initial SCS curve number II (CN2)

­ Runoff lag coefficient (SURLAG)

­ Initial SCS curve number II (CN2)

­ Runoff lag coefficient (SURLAG)

ET

­ Soil evaporation coefficient (PARM12)

­ Evaporation plant cover factor (PARM17)

­ Soil evaporation factor (ESCO)

­ Plant uptake factor (EPCO)

­ Plant uptake factor (EPCO)

­ Plant uptake factor (EPCO)

Baseflow/

Drainage

­ Return flow ratio (RFPO)

­ Subsurface flow factor (PARM90)

­ GW storage threshold for return flow (PARM40

­ Saturated conductivity factor (SATO)

­ Groundwater residence time (RFTO)

­ Baseflow alpha-factor (ALPHA_BF)

­ Groundwater “revap” coefficient (REVAP)

­ GW storage threshold for return flow (GWQMN)

­ Hydraulic conductivity (SOL_K)

­ GW delay (GW DELAY)

­ Baseflow alpha-factor (ALPHA_BF)

­ Groundwater “revap” coefficient (REVAP)

­ GW storage threshold for return flow to occur (FLOMIN)

­ Hydraulic conductivity (SOL_K)

­ Percolation coefficient (PERCO)

Erosion/

Sediment

­ Peak runoff rate-rainfall energy factor (APM)

­ Support practice factor (PEC)

­ Sediment routing exponent (PARM18)

­ Peak rate adjustment factor for sediment routing (AJ_PKR)

­ Support practice factor (USLE P)

­ Soil erodibility factor (USLE K)

­ Peak rate adjustment factor for sediment routing (AJ_PKR)

­ Support practice factor (USLE P)

­ Soil erodibility factor (USLE K)

Phosphorous loss

­ Soluble P runoff coefficient (PARM8)

­ P upward movement factor (PARM59)

­ P percolation factor (PPERCO)

­ P soil partitioning factor (PHOSKD)

­ Phosphorous availability index (PSP)

­ P percolation factor (PPERCO)

­ P soil partitioning factor (PHOSKD)

­ Phosphorous availability index (PSP)