Appendix A — Summary of information in input files of SWAP

File name extensions are fixed. Optional output files are denoted with #.

Tip A.1: Summary of information in input files. Optional files are denoted with #.

Main input file (*.swp)

  • General section
    • Environment
    • Timing of simulation period
    • Timing of boundary conditions
    • Processes which should be simulated
    • Optional output files
  • Meteorology section
    • Name of file with meteorological data
    • Rainfall intensity
  • Crop section
    • Crop rotation scheme (calendar and files)
    • Crop data input file
    • Calculated irrigation input file
    • Crop emergence and harvest
    • Fixed irrigation parameters (Amount and quality of prescribed irrigation applications)
  • Soil water section
    • Initial moisture condition
    • Ponding
    • Soil evaporation
    • Vertical discretization of soil profile
    • Soil hydraulic functions
    • Hysteresis of soil water retention function
    • Maximum rooting depth
    • Similar media scaling of soil hydraulic functions
    • Preferential flow due to soil volumes with immobile water
    • Preferential flow due to macro pores
    • Snow and frost
    • Numerical solution of Richards’ equation
  • Lateral drainage section
    • Name of file with drainage input data (optional)
    • Name of file with runon input data (optional)
  • Bottom boundary section
    • Name of file with bottom boundary conditions (optional)
    • selection out of 8 options
  • Heat flow section
  • Calculation method
  • Solute transport section
    • Specify whether simulation includes solute transport or not
    • Top boundary and initial condition
    • Diffusion, dispersion, and solute uptake by roots
    • Adsorption
    • Decomposition
    • Transfer between mobile and immobile water volumes (if present)
    • Solute residence in the saturated zone

File with daily meteorological data (*.met, *.rain or *.yyy)

  • Radiation, temperature, vapour pressure, daytime wind speed and/or reference evapotranspiration,
  • Rainfall and/or rainfall intensities

File with detailed crop growth (*.crp) #

  • Crop section
    • Crop height
    • Crop development
    • Initial values
    • Green surface area
    • Assimilation
    • Assimilates conversion into biomass
    • Maintenance respiration
    • Dry matter partitioning
    • Death rates
    • Crop water use
    • Salt stress
    • Interception
    • Root growth and density distribution
  • Calculated Irrigation section
    • General
    • Irrigation time criteria
    • Irrigation depth criteria

File with simple crop growth (*.crp) #

  • Crop section
    • Crop development
    • Light extinction
    • Leaf area index or soil cover fraction
    • Crop factor or crop height
    • Rooting depth
    • Soil water extraction by plant roots
    • Salt stress
    • Interception
    • Root density distribution and root growth
  • Calculated Irrigation section
    • General
    • Irrigation time criteria
    • Irrigation depth criteria

File with drainage data (*.dra) #

  • Basic drainage section
    • Table of drainage flux - groundwater level
    • Drainage formula of Hooghoudt or Ernst
    • Drainage and infiltration resistances
  • Extended drainage section
    • Drainage characteristics
    • Surface water level of primary and/or secondary system
    • Simulation of surface water level
    • Weir characteristics