# Simple ET0 Forms of Penman’s Equation without Wind and/or Humidity Data. II: Comparisons with Reduced Set-FAO and Other Methodologies

@article{Valiantzas2013SimpleEF, title={Simple ET0 Forms of Penman’s Equation without Wind and/or Humidity Data. II: Comparisons with Reduced Set-FAO and Other Methodologies}, author={John D. Valiantzas}, journal={Journal of Irrigation and Drainage Engineering-asce}, year={2013}, volume={139}, pages={9-19} }

AbstractIn the companion paper, a set of simplified formulas was derived to approximate the Penman equation for estimating reference evapotranspiration (ET0) from limited data. The first suggested formula is explicit for routinely measured data: air temperature, solar radiation, relative humidity, and wind velocity. Simplifications of this formula were made for places where wind speed and/or relative humidity data are not available. The performance of the new derived formulas was tested under…

## 47 Citations

### Simple ET 0 Forms of Penman's Equation without Wind and/or Humidity Data. I: Theoretical Development

- Environmental Science
- 2013

AbstractIn this paper, new algebraic expressions are derived for estimating reference evapotranspiration (ET0) from limited meteorological data. Reference evapotranspiration is commonly computed from…

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- Environmental Science
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### Simplified limited data Penman’s ET0 formulas adapted for humid locations

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### Performance of the FAO Penman-Monteith equation under limiting conditions and fourteen reference evapotranspiration models in southern Manitoba

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Evapotranspiration is a key component of water and energy balance. An accurate estimate of reference evapotranspiration (ETo) is important for determining the water demand of field crops, water…

### Evaluation of FAO-56 Penman-Monteith Model with Limited Data and the Valiantzas Models for Estimating Grass-Reference Evapotranspiration in Sahelian Conditions

- Environmental Science
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AbstractAccurate determination of grass-reference evapotranspiration (ETo) is very important for agricultural, hydrological, and environmental studies, especially under increasing water scarcity and…

### FAO-56 Penman-Monteith Daily from Linear Regression Calibrated Hargreaves Equation with Wind Terms in Tropics with Limited Data

- Environmental Science
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Hargreaves equation (HG), which lacks a wind speed () term, was modified, through a linear regression calibration method, into LHGu which has terms and is useful for quickly computing practically accurate estimates of FPM for varying daily where only temperature data are available.

### Comparison of Different Empirical Methods for Estimating Daily Reference Evapotranspiration in Mediterranean Climate

- Environmental Science
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AbstractThe estimation of reference evapotranspiration (ET0) is very important for the management of water resources and the determination of the water budget, especially under arid conditions. The…

### Historical developments of models for estimating evaporation using standard meteorological data

- Environmental Science
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Evaporation plays a key role in the hydrology of a catchment. World‐wide actual terrestrial evaporation is approximately two third of terrestrial precipitation. Evaporation is the focus of this study…

### Comparison of sum-of-hourly and daily time step standardized ASCE Penman-Monteith reference evapotranspiration

- Environmental ScienceTheoretical and Applied Climatology
- 2017

The objective of this study was to quantify differences associated with using 24-h time step reference evapotranspiration (ETo), as compared with the sum of hourly ETo computations with the…

### ESTIMATION AND COMPARISON OF POTENTIAL EVAPOTRANSPIRATION BASED ON DAILY AND MONTHLY DATA FROM SPERCHIOS VALLEY IN CENTRAL GREECE

- Environmental Science
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There is no golden rule concerning the optimal equations to estimate reference potential evapotranspiration (PETref) under various climates because even in the same climatic type, different studies…

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