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codes.bsn

This file contains control codes for the simulation of basin-level processes.

Field

Description

Type

pet_file

Currently not used

string

wq_file

Currently not used

string

pet

Potential evapotranspiration (PET) method

Numerous methods exist to calculate potential evapotranspiration. Three of the most widely-used ones are included in SWAT+, the Priestley-Taylor, Penman/Monteith, and Hargreaves equations. The codes for the three methods are listed in the table below. If a method other than Priestley-Taylor, Penman/Monteith, or Hargreaves is recommended for the area, in which the watershed is located, the user can calculate daily PET values with the recommended method and import them into SWAT+ (using pet in weather-sta.cli).

Code

Option

Priestley-Taylor method

Penman/Monteith method

crack

Crack flow code

Code

Option

Do not compute crack flow in soil

Compute crack flow in soil

If crack = 1, the crack volume potential is controlled by perc_crk in soils.sol.

swift_out

SWIFT input file

Code

Option

Do not write SWIFT input file

Write SWIFT input file (swift_hru.inp)

rte_cha

Channel water routing method

There are two channel water routing methods available in SWAT+:

Code

Option

Variable Storage method

Muskingum method

The user must be careful to define , and in when the Muskingum method is chosen.

nostress

Plant stress

Code

Option

All plant stresses applied

Turn off all plant stress

Turn off nutrient plant stress only

carbon

Carbon routine

Code

Option

Static soil carbon

C-FARM one carbon pool model

Century model

Papers Xuesong, Armen

lapse

Precipitation and temperature lapse rate control

Code

Option

Do not adjust precipitation and temperature for elevation

Adjust precipitation and temperature for elevation

uhyd

Unit Hydrograph method

Code

Option

Triangular Unit Hydrograph

Gamma Function Unit Hydrograph

The Unit Hydrograph method is only relevant when simulating at a sub-daily timestep and gampt = 0.

tiledrain

Tile drainage equation code

Code

Option

Simulate tile flow using drawdown days equation

Simulate tile flow using DRAINMOD equations

Papers Daniel, Tássia

wtable

Water table depth algorithm code

Code

Option

Simulate shallow water table using original water table depth routine (fill to upper limit)

Simulate shallow water table using DRAINMOD water table depth routine

soil_p

Soil phosphorus model

Code

Option

Original soil phosphorus model

New soil phosphorus model

Vadas & White (2010)

gampt

Surface runoff method

Code

Option

Curve Number

Green & Ampt

qual2e

Instream nutrient routing method

Code

Option

Instream nutrient routing using QUAL2E

Instream nutrient routing using QUAL2E with simplified nutrient transformations

gwflow

Flood routing

Code

Option

GWFlow module not active

GWFlow module active