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NAME   -  Computes  evapotranspiration  calculation  modified or original Hargreaves
       formulation, 2001.


       imagery, evapotranspiration

SYNOPSIS --help        [-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]

DESCRIPTION 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.time, r.sun


           ·   Hargreaves GL, Hargreaves GH, Riley JP, 1985. Agricultural  benefits  for  Senegal
               River   Basin.   Journal   of   Irrigation   and   Drainange   Engineering,  ASCE,

           ·   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 23:51:14 +0100 (Wed, 27 Jan 2016) $


       Available at: source code (history)

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