Land Use Management

A primary goal of environmental modeling is to assess the impact of human activities on a given system. Central to this assessment is the itemization of the land and water management practices taking place within the system. This section contains input data for planting, harvest, irrigation applications, nutrient applications, pesticide applications, and tillage operations. Information regarding tile drains and urban areas is also stored in this file.

SWAT+ Input File

Database Table

landuse.lum

landuse_lum

management.sch

management_sch

management_sch_auto

management_sch_op

cntable.lum

cntable_lum

ovn_table.lum

ovn_table_lum

cons_practice.lum

cons_practice_lum

In addition to the above, SWAT+ Editor groups the operations databases in this section of the editor. However, within the SWAT+ master watershed file (file.cio), these are listed under the ops section.

SWAT+ Input File

Database Table

graze.ops

graze_ops

harv.ops

harv_ops

irr.ops

irr_ops

sweep.ops

sweep_ops

fire.ops

fire_ops

chem_app.ops

chem_app_ops

Land Use Management

This section is the entry point for management data in SWAT+. It comprises cross-walks to several other sections of data.

This data is accessed from the HRU properties section (hru-data.hru).

landuse_lum

Field

Type

Description

Related Table

id

int

Auto-assigned identifier

name

text

Name of the land use properties

cal_group

text

Calibration group

plnt_com_id

int

Plant community

plant_ini

mgt_id

int

Management schedule

management_sch

cn2_id

int

Curve number

cntable_lum

cons_prac_id

int

Conservation practices

cons_prac_lum

urban_id

int

Urban land use

urban_urb

urb_ro

text

Urban runoff

ov_mann_id

int

Overland flow Manning's n

ovn_table_lum

tile_id

int

Tile drain

tiledrain_str

sep_id

int

Septic tank

septic_str

vfs_id

int

Filter strip

filterstrip_str

grww_id

int

Grassed waterway

grassedww_str

bmp_id

int

Best management practices

bmpuser_str

description

text

Optional description of the row

Management Schedules

Management schedules comprise auto-schedules (decision tables) and/or operations schedules.

When you import your project from GIS, SWAT+ assigns auto-schedules for management based on your crop land use.

Plant Type (in plants_plt)

Decision Table Template

warm_annual

pl_hv_corn

cold_annual

pl_hv_wwht

perennial

no management schedule

For example, oats is a cold annual crop. If this crop is in your HRUs, a decision table named pl_hv_oats will be created based on the template of pl_hv_wwht when you import your data from GIS.

Adding/Editing a Schedule

From the management schedules section, click create a new record or click edit on a row in the table. Give your schedule a unique name.

To add an automatic schedule, start typing a decision table name in the box provided. Click the desired result from the list of matches that pops up, and click the add button. If you enter more than one schedule, you can drag and drop to sort.

To add an operation, click the add operation button. Select your operation type from the form that pops up and complete the remaining fields. Click save when done to add the operation to your table.

When you're done adding automatic schedules and operations, click the save changes button to save your management schedule.

Table Parameters

management_sch

Field

Type

Description

id

int

Auto-assigned identifier

name

text

Name of the schedule

management_sch_auto

Field

Type

Description

id

int

Auto-assigned identifier

management_sch_id

int

ID of management schedule

d_table_id

int

ID of decision table

management_sch_op

Field

Type

Description

id

int

Auto-assigned identifier

management_sch_id

int

ID of management schedule

op_typ

text

Type of operation (see options below)

mon

int

Month operation takes place

day

int

Day operation takes place

op_data1

text

Dependent on op_typ (see options below)

op_data2

text

op_data3

real

Override value

Operations Types

Code

Description

plnt

plant

harv

harvest only

kill

kill

hvkl

harvest and kill

till

tillage

irrm

irrigation

fert

fertilizer

pest

pesticide application

graz

grazing

burn

burn

swep

street sweep

prtp

print plant vars

skip

skip to end of the year

Operation Data 1 Values

Code

Value

Look-up Table

plnt

plant name

plants_plt

harv

plant name

plants_plt

kill

plant name

plants_plt

hvkl

plant name

plants_plt

till

tillage name

tillage_til

irrm

irrigation operation name

irr_ops

fert

fertilizer name

fertilizer_frt

pest

pesticide name

pesticide_pst

graz

graze operation name

graze_ops

burn

fire operation name

fire_ops

swep

street sweep operation name

sweep_ops

prtp

none

skip

none

Operation Data 2 Values

Code

Value

Look-up Table

plnt

none

harv

harvest operation name

harv_ops

kill

none

hvkl

harvest operation name

harv_ops

till

none

irrm

none

fert

chemical application operation name

chem_app_ops

pest

chemical application operation name

chem_app_ops

graz

none

burn

none

swep

none

prtp

none

skip

none

Operations Databases

Values in the operations tables are provided in the SWAT+ datasets database and copied to your project database during project setup. You may modify them or add new rows as needed in the editor.

Harvest

SWAT+ Input File

Database Table

harv.ops

harv_ops

Field

Type

Description

Units

id

int

Auto-assigned identifier

name

text

Name of operation

harv_typ

text

Harvest type: grain, biomass, residue, tree, or tuber

harv_idx

real

Harvest index target specified at harvest

harv_eff

real

Harvest efficiency

harv_bm_min

real

Minimum biomass to allow harvest

kg/ha

description

text

Optional description

Graze

SWAT+ Input File

Database Table

graze.ops

graze_ops

Field

Type

Description

Units

Range

id

int

Auto-assigned identifier

name

text

Name of operation

fert_id

int

ID of fertilizer from fertilizer_frt

bm_eat

real

Dry weight of biomass removed by grazing daily

kg/ha

0-500

bm_tramp

real

Dry weight of biomass removed by trampling daily

kg/ha

0-500

man_amt

real

Dry weight of manure deposited

kg/ha

0-500

grz_bm_min

real

Minimum plant biomass for grazing to occur

kg/ha

0-5000

description

text

Optional description

Irrigation

SWAT+ Input File

Database Table

irr.ops

irr_ops

Field

Type

Description

Units

Range

id

int

Auto-assigned identifier

name

text

Name of operation

irr_eff

real

Irrigation efficiency

0-1

surq_rto

real

Surface runoff ratio

0-1

irr_amt

real

Depth of application for subsurface

mm

0-100

irr_salt

real

Concentration of salt in irrigation water

mg/l

irr_no3n

real

Concentration of nitrate in irrigation water

mg/l

irr_po4n

real

Concentration of phosphate in irrigation water

mg/l

description

text

Optional description

Chemical Application

SWAT+ Input File

Database Table

chem_app.ops

chem_app_ops

Field

Type

Description

Units

id

int

Auto-assigned identifier

name

text

Name of operation

chem_form

text

Chemical form: liquid or solid

app_typ

text

Application type: spread, spray, inject, direct

app_eff

real

Application efficiency

foliar_eff

real

Foliar efficiency

inject_dp

real

Injection depth

mm

surf_frac

real

Surface fraction amount in upper 10mm

drift_pot

real

Drift potential

aerial_unif

real

Aerial uniformity

description

text

Optional description

Fire

SWAT+ Input File

Database Table

fire.ops

fire_ops

Field

Type

Description

id

int

Auto-assigned identifier

name

text

Name of operation

chg_cn2

real

Change in SCS curve number II value

frac_burn

real

Fraction burned

description

text

Optional description

Sweep

SWAT+ Input File

Database Table

sweep.ops

sweep_ops

Field

Type

Description

id

int

Auto-assigned identifier

name

text

Name of operation

swp_eff

real

Removal efficiency of sweeping operation

frac_curb

real

Fraction of the curb length that is sweep-able

description

text

Optional description

Curve Number Table

Values in this table are provided in the SWAT+ datasets database and copied to your project database during project setup. You may modify them or add new rows as needed in the editor.

SWAT+ Input File

Database Table

cntable.lum

cntable_lum

Field

Type

Description

Range

id

int

Auto-assigned identifier

name

text

Name of curve number entry

cn_a

real

Curve number for hydrologic soil group A

30-100

cn_b

real

Curve number for hydrologic soil group B

30-100

cn_c

real

Curve number for hydrologic soil group C

30-100

cn_d

real

Curve number for hydrologic soil group D

30-100

description

text

Optional description

treat

text

Treatment/Practice

cond_cov

text

Condition of cover

Conservation Practices

Values in this table are provided in the SWAT+ datasets database and copied to your project database during project setup. You may modify them or add new rows as needed in the editor.

SWAT+ Input File

Database Table

cons_practice.lum

cons_practice_lum

Field

Type

Description

id

int

Auto-assigned identifier

name

text

Name of curve number entry

usle_p

real

Usle p factor

slp_len_max

real

Maximum slope length

description

text

Optional description

Overland Flow Manning's n

Values in this table are provided in the SWAT+ datasets database and copied to your project database during project setup. You may modify them or add new rows as needed in the editor.

SWAT+ Input File

Database Table

ovn_table.lum

ovn_table_lum

Field

Type

Description

id

int

Auto-assigned identifier

name

text

Name of curve number entry

ovn_mean

real

Overland flow Manning's n = mean

ovn_min

real

Overland flow Manning's n = min

ovn_max

real

Overland flow Manning's n = max

description

text

Optional description