Evaporation is one of the largest water losses from most of the dam lakes in Iran. Estimating the evaporation rate enables us to apply the proper evaporation mitigation technologies. In this study, the feasibility of different evaporation estimation methods was studied to find an optimum method with a fair tradeoff between cost and accuracy. The optimum method may vary depending on the climate....

Evapotranspiration is an important parameter to know in the management of agricultural water resources. There are several methods for estimating evapotranspiration (ETo). The FAO Penman-Monteith method considered universal standard ETo, however, climate data needed calculate ETo not always available, so it necessary evaluate performance using equations as a comparison evapotranspiration. This s...

abstract the present study is attempted to present the minimum required meteorological parameters for reference evapotranspiration estimation at hamedan region of iran from 1997 to 1998. employing pierson test, six meteorological parameters which are used by penman-montieth fao-56 method including maximum and minimum air temperature, maximum and minimum relative humidity, wind speed and daily s...

abstract evapotranspiration as one of the most important components of the hydrologic cycle, plays a key role in water resources management, crop yield simulation and irrigation scheduling. therefore, presenting a low cost and precision model is very essential for calculations of hourly eto. although, there are empirical formulas, their performances are not all satisfactory due to the complicat...

abstract one of the losses decrease's ways in fields, is the proper irrigation management, which its base is the accurate estimation of crop water requirement. equations which are used to calculate the reference evapotranspiration (eto), do not use the same climatic parameters and due to their empirical base, are not match to all climatic situations. so it is needed to clarify proper methods fo...

This paper aims to estimate Actual Evapotranspiration of major crops by using CROPWAT 8.0 software in 2A canal command Mahanadi Dhamtari district. evapotranspiration is a key process hydrological cycle and sole term that links land surface water balance energy balance. Irrigation an essential part different because rainfall not enough for irrigated farmland. Long daily meteorological data inclu...

GLEAMS (Leonard et al., 1987; Knisel et al., 1992; Knisel, 1993) is a continuous, field-scale hydrology and chemical transport model like Opus, simulating the transport and transformations of nutrients and pesticides in the root zone and in surface runoff. It runs on a daily time step, using daily rainfall information. GLEAMS uses a modification of the SCS Curve Number method (William and La Se...

introduction: evaporation and evapotranspiration are two major components of hydrological cycle which are very important for agricultural studies as well as water resources management. so far, various methods have been addressed for the estimation of daily reference crop evapotranspiration (et0). among them, fao penman-montieth 56 (pmf-56) (allen et al., 1998) is widely used as a standard metho...

Evapotranspiration (ETo) is considered a main component of the hydrological cycle. This study was carried out on medium-size park within highly urbanized area, close to center Melbourne city. The purpose calculate reference evapotranspiration (ETo), particularly at specified spot in corner park. hand-held device used collect data gave consistent results and reduced need for assumptions. Penman-...