i.evapo.mh.1grass man page

i.evapo.mh — Computes evapotranspiration calculation modified or original Hargreaves formulation, 2001.


imagery, evapotranspiration


i.evapo.mh --help
i.evapo.mh [-zhs] netradiation_diurnal=name average_temperature=name minimum_temperature=name maximum_temperature=name  [precipitation=name]  output=name  [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]



Set negative ETa to zero


Use original Hargreaves (1985)


Use Hargreaves-Samani (1985)


Allow output files to overwrite existing files


Print usage summary


Verbose module output


Quiet module output


Force launching GUI dialog


netradiation_diurnal=name [required]

Name of input diurnal net radiation raster map [W/m2/d]

average_temperature=name [required]

Name of input average air temperature raster map [C]

minimum_temperature=name [required]

Name of input minimum air temperature raster map [C]

maximum_temperature=name [required]

Name of input maximum air temperature raster map [C]


Name of precipitation raster map [mm/month]
Disabled for original Hargreaves (1985)

output=name [required]

Name for output raster map [mm/d]


i.evapo.mh calculates the reference evapotranspiration (ET) after Hargreaves et al. (1985), Hargreaves and Samani (1985) and the Modified Hargreaves version found in Droogers and Allen (2002).

See Also

i.evapo.pt, i.evapo.pm, i.evapo.time, r.sun


  • Hargreaves GL, Hargreaves GH, Riley JP, 1985. Agricultural benefits for Senegal River Basin. Journal of Irrigation and Drainange Engineering, ASCE, 111(2):113-124.
  • Droogers P, Allen RG, 2002. Towards a simplified global reference evapotranspiration equation. Irrigation Science.
  • Droogers, P., Allen RG. 2002. Estimating reference evapotranspiration under inaccurate data conditions. Irrigation and Drainage Systems 16: 33-45.
  • Hargreaves GH, Samani ZA, 1985. Reference crop evapotranspiration from ambient air temperature. American Society of Agricultural Engineers (Microfiche collection)(USA). no. fiche no. 85-2517.


Yann Chemin, GRASS Development team, 2007-2016

Last changed: $Date: 2016-01-27 23:53:28 +0100 (Wed, 27 Jan 2016) $

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