Hargreaves-Samani method: Estimation of historical annual, seasonal, and monthly Reference Evapotranspiration (ETo) in Dadu District, Pakistan

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Ali Shah Shoukat

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Journal Paper

Paper Information

Journal: JOURNAL OF APPLIED RESEARCH IN WATER AND WASTEWATER Year:2022 | Volume:9 | Issue:1 Page(s): 30-39

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Title

Hargreaves-Samani method: Estimation of historical annual, seasonal, and monthly Reference Evapotranspiration (ETo) in Dadu District, Pakistan

Author(s)

Ali Shah Shoukat | Issue Writer Certificate

Keywords

Reference evapotranspiration

IDW interpolation

NASA-POWER

Hargreaves-Samani

Abstract

Reference evapotranspiration (ETo) counted as the main factor for assessing the amount of water, needed for crops as well as for the planning of water resources management. Several techniques, methods, and equations have been used for computing ETo. Thus, required weather data sets are the main challenge for evaluating this factor. FAO Penman-Monteith is the most popular technique to determine the ETo. The FAO 56-PM equation requires accurate weather data like air temperature, humidity, solar radiations, and wind speed. Unfortunately, not all these data are possible to reach easily on the station's side. Therefore, FAO 56 recommended another equation namely Hargreaves-Samani (HS) equation when sufficient weather data may not be available to estimate ETo by FAO56-PM. In the context of this, this study aimed to estimate ETo using the HS equation. For this purpose, historical annual, seasonal, and monthly temperature and wind data were collected from 1981 to 2020 using ‘, The Prediction of Worldwide Energy Resources (POWER)’,web portal. It is concluded that the HS method in conjunction with the POWER datasets and spatially mapping with IDW interpolation gave reliable and accurate results of ETo. This technique gives an idea of water losses in a district and demonstrates a trend of historical annual, seasonal, and monthly ETo.

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APA: Copy

Ali Shah, Shoukat. (2022). Hargreaves-Samani method: Estimation of historical annual, seasonal, and monthly Reference Evapotranspiration (ETo) in Dadu District, Pakistan. JOURNAL OF APPLIED RESEARCH IN WATER AND WASTEWATER, 9(1), 30-39. SID. https://sid.ir/paper/1049650/en

Vancouver: Copy

Ali Shah Shoukat. Hargreaves-Samani method: Estimation of historical annual, seasonal, and monthly Reference Evapotranspiration (ETo) in Dadu District, Pakistan. JOURNAL OF APPLIED RESEARCH IN WATER AND WASTEWATER[Internet]. 2022;9(1):30-39. Available from: https://sid.ir/paper/1049650/en

IEEE: Copy

Shoukat Ali Shah, “Hargreaves-Samani method: Estimation of historical annual, seasonal, and monthly Reference Evapotranspiration (ETo) in Dadu District, Pakistan,” JOURNAL OF APPLIED RESEARCH IN WATER AND WASTEWATER, vol. 9, no. 1, pp. 30–39, 2022, [Online]. Available: https://sid.ir/paper/1049650/en

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