Edit HRU Data
What is it?
This interface allows users to modify HRU data.How to use it:
Subbasin number, land use, soil, slope and HRU number of the HRU currently being edited are displayed on the top.
Edit general HRU parameters
General HRU parameters are listed under 'HRU parameters' in 'General HRU parameters' tab.Parameter description:
HRU_FR : Fraction of subbasin area contained in HRU.
SLSUBBSN : Average slope length (m).
HRU_SLP : Average slope stepness (m/m).
OV_N : Manning's "n" value for overland flow.
LAT_TTIME : Lateral flow travel time (days).
LAT_SED : Sediment concentration in lateral flow and groundwater flow (mg/l).
SLSOIL : Slope length for lateral subsurface flow (m).
CANMX : Maximum canopy storage (mm).
ESCO : Soil evaporation compensation factor.
EPCO : Plant uptake compensation factor.
RSDIN : Initial residue cover (kg/ha).
ERORGN : Organic N enrichment ratio.
ERORGP : Organic P enrichment ratio.
POT_FR : Fraction of HRU are that drains into pothole.
FLD_FR : Fraction of HRU that drains into floodplain.
RIP_FR : Fraction of HRU that drains into riparian zone.
DEP_IMP : Depth to impervious layer in soil profile (mm).
EVPOT: Pothole evaporation coefficient.
DIS_STREAM: Average distance to stream (m).
SURLAG: Surface runoff lag time in the HRU (days).
R2ADJ: Curve number retention parameter adjustment factor to adjust surface runoff for flat slopes.
CMN: Rate factor for humus mineralization of active organic nitrogen.
CDN: Denitrification exponential rate coefficient.
NPERCO: Nitrogen percolation coefficient.
PHOSKD: Phosphorus soil partitioning coefficient.
PSP: Phosphorus sorption coefficient.
SDNCO: Denitrification threshold water content.
IWETILE: Whether tile drains to wetland (1: tile flow to wetland, 0: tile does not flow to wetland).
IWETGW: Groundwater flow to wetland (1: groundwater flows to wetland, 0: groundwater does not flows to wetland).
Edit carbon cycling parameters
Carbon cycling parameters are listed under 'Carbon cycling' in 'Carbon and urban BMP parameters' tab.Parameter description:
CF: Decomposition response to soil temperature and moisture.
CFH: Maximum humification rate.
CFDEC: Undistrurbed soil turnover rate under optimum soil water and temperature.
Edit urban BMP effects
Urban BMP parameters are listed under 'Urban BMP effects' in 'Carbon and urban BMP parameters' tab.Parameter description:
SED_CON: Sediment concentration in runoff, after urban BMP is applied (ppm).
ORGN_CON: Organic nitrogen concentration in runoff, after urban BMP is applied (ppm).
ORGP_CON: Organic phosphorus concentration in runoff, after urban BMP is applied (ppm).
SOLN_CON: Soluble nitrogen concentration un runoff, after urban BMP is applied (ppm).
SOLP_CON: Soluble phosphorus concentration in runoff, after urban BMP is applied (ppm).
Edit tile drainage parameters
Tile drainage parameters are listed under 'DRAINMOD tile drainage' in 'Drainage and pothole parameters' tab.Parameter description:
RE: Effective radius of drains (mm).
SDRAIN: Distance between two drains or tile tubes (mm).
DRAIN: Drainage coefficient (mm/hr).
LATKSATF: Multiplication factor to determine lateral Ksat value from SWAT Kswat input value.
Edit HRU pothole parameters
HRU pothole parameters are listed under 'HRU pothole parameters' in 'Drainage and pothole parameters' tab.Parameter description:
POT_TILE : Average daily outflow to main channel from tile flow (depth (mm) over entire HRU).
POT_VOLX : Maximum volume of water stored in the pothole (depth (mm) over entire HRU).
POT_VOL : Initial volume of water stored in the pothole (depth (mm) over entire HRU).
POT_NSED : Normal sediment concentration in pothole (mg/l).
POT_NO3L : Nitrate decay rate in pothole (1/day).
POT_SOLP: Soluble P loss rate in the pothole.
POT_K: Hydraulic conductivity of soil surface of pothole.
N_REDUC: Nitrogen uptake reduction factor (not implemented yet).
N_LAG: Lag coefficient for calculating nitrate concentration in subsurface drains.
N_LN: Power function exponent for calculating nitrate concentration in subsurface drains.
N_LNCO: Coffecient for power function for calculating nitrate concentration in subsurface drains.
Applying the changes
Under 'Extend parameter edits', check 'Extend ALL HRU parameters' to apply all the current HRU parameters. To only apply the parameters that have been updated, leave it unchecked.To apply the changes to current HRU only, check 'Extend edits to current HRU'.
To apply the changes to all HRUs, check 'Extend edits to ALL HRUs'.
To apply the changes to selected HRUs, including the current one, check 'Extend edits to selected HRUs' and select the subbasins from the list on the right. Next, select the landuses, soils and slopes to apply the changes.
Click 'Save Edits' and close the interface.
Don't forget to click 'Save Edits' butoon on the 'mgnSWAT Edit SWAT Data' interface.