## DESCRIPTION

*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).

## REFERENCES

- 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.

## SEE ALSO

*[i.evapo.pt](i.evapo.pt.md), [i.evapo.pm](i.evapo.pm.md),
[i.evapo.time](i.evapo.time.md), [r.sun](r.sun.md)*

## AUTHOR

Yann Chemin, GRASS Development team, 2007-2016
