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.

Example of adding automatic schedules

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.

Example of adding a plant operation

Example operations 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