1 of 49

landuse.lum

This file summarizes the main land use information and references several other files that specify the details.

Field

Description

Type

Name of the land use and management record

string

Calibration group

string

name (landuse.lum)

Name of the land use and management record

The name of the land use and management record is a primary key referenced by in . All names in the landuse.lum file must be unique.

cal_grp

Calibration group

User-defined calibration groups that can be used as conditions in .

plnt_com

Pointer to the plant community file

The pointer to the plant community file is a foreign key referencing in .

mgt

Pointer to the management schedule file

The pointer to the management schedule file is a foreign key referencing in .

cn2

Pointer to the Curve Number database

The pointer to the Curve Number database file is a foreign key referencing in .

cons_prac

Pointer to the conservation practice database

The pointer to the conservation practice database is a foreign key referencing in .

urban

Pointer to the urban database

The pointer to the urban database is a foreign key referencing in .

urb_ro

Urban runoff simulation option

Most large watersheds and river basins contain areas of urban land use. Estimates of the quantity and quality of runoff in urban areas are required for comprehensive management analysis. SWAT+ calculates runoff from urban areas with the SCS curve number method or the Green & Ampt equation. Loadings of sediment and nutrients are determined using one of two options. The first is a set of linear regression equations developed by the USGS (Driver and Tasker, 1988) for estimating storm runoff volumes and constituent loads. The other option is to simulate the build-up and wash-off mechanisms, similar to SWMM (Storm Water Management Model; Huber and Dickinson, 1988).

Option

Description

usgs_reg

USGS regression equations

buildup_washoff

build-up/wash-off algorithm

References

Driver and Tasker (1988)
Huber and Dickinson (1988)

ov_mann

Pointer to the overland Manning's n database

The pointer to the overland Manning's n database is a foreign key referencing in .

tile

Pointer to the tile drain file

The pointer to the tile drain file is a foreign key referencing in .

sep

Pointer to the septic file

The pointer to the septic file is a foreign key referencing in .

vfs

Pointer to the filter strip file

The pointer to the filter strip file is a foreign key referencing in .

grww

Pointer to the grassed waterway file

The pointer to the grassed waterway file is a foreign key referencing in .

bmp

Pointer to the user BMP file

The pointer to the user BMP file is a foreign key referencing in .

plant.ini

This file stores information about the plants growing in a plant community.

A plant community can consist of plants growing at the same time or plants growing in rotation.

The structure of the file plant.ini is different than that of most other SWAT+ input files. The first line for each plant community specifies how many plants there are in the community and what the initial year of the rotation is. It is followed by one line per plant in the community.

Field

Description

Type

Unit

Default

Range

name (plant.ini)

Plant community name

The name of the plant community is a primary key referenced by in . All names in the plant.ini file must be unique.

plnt_cnt

Number of plants in the community

This number must be consistent with the number of plants listed for the community.

rot_yr_ini

Initial rotation year

plnt_name

Plant name as in plant database

The plant name is a foreign key referencing the primary key in .

lc_status

Land cover status at start of simulation

Option

Description

Plant not growing

Plant growing

lai_init

Initial Leaf Area Index

This variable is required for plants that are growing at the beginning of the simulation (lc_status = y).

bm_init

Initial plant biomass

This variable is required for plants that are growing at the beginning of the simulation (lc_status = y).

phu_init

Initial fraction of plant heat units accumulated

This variable is required for plants that are growing at the beginning of the simulation ( = y).

plnt_pop

Plant population

yrs_init

Age of plant at start of simulation

rsd_init

Initial residue cover

management.sch

This file is used to schedule management operations.

Management operations can be scheduled by heat units/dates or by Decision Tables.

The structure of the management.sch file is different than that of most other SWAT+ input files. The first line for each management schedule specifies the name of the schedule and the number of scheduled and/or automatic operations. When using scheduled operations, it is followed by one line per operation listing operation-specific data. The operations must be scheduled by date (Heat Unit scheduling must be done using a Decision Table) listed in chronological order. For automatic operations, the names of the Decision Tables in lum.dtl are listed (one name per line). Behind the name of a Decision Table, the user may list the crop(s) used in the Decision Table, which can be useful when the same Decision Table is used for different crop rotations (see xxx in yyy).

The user may use both scheduled operations and Decision Tables for the same land use. If doing so, the names of the DTs should be listed first.

Field

Description

Type

name (management.sch)

Name of the management schedule

The name of the management schedule is a primary key referenced by mgt in landuse.lum. All names in the management.sch file must be unique.

op_data1

Operation data 1

Operation

Use of variable

op_data3

Operation data 3

Operation

Use of variable

pcom

plnt

harv

hvkl

cn_a

Curve number for hydrologic soil group A

cn_b

Curve number for hydrologic soil group B

cn_c

Curve number for hydrologic soil group C

cn_d

Curve number for hydrologic soil group D

landuse.lum

name (landuse.lum)

cal_grp

plnt_com

mgt

cn2

cons_prac

urban

urb_ro

hashtagReferences

ov_mann

tile

sep

vfs

grww

bmp

plant.ini

name (plant.ini)

plnt_cnt

rot_yr_ini

plnt_name

lc_status

lai_init

bm_init

phu_init

plnt_pop

yrs_init

rsd_init

management.sch

name (management.sch)

op_data1

op_data3

cn_a

cn_b

cn_c

cn_d

mgt

plnt_com

urban

cal_grp

name (landuse.lum)

cn2

vfs

grww

landuse.lum

tile

cons_prac

ov_mann

sep

rot_yr_ini

plnt_name

bmp

urb_ro

hashtagReferences

plnt_cnt

yrs_init

plant.ini

name (plant.ini)

phu_init

plnt_pop

lc_status

bm_init

lai_init

rsd_init

name (management.sch)

management.sch

op_data3

op_data1

cn_a

cn_b

cn_c

cn_d

slp_len_max

name (ovn_table.lum)

ovn_mean

op_typ

name (cntable.lum)

op_data2

cntable.lum

Landuse and Management

References

References

References