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Paper Information

Journal:   IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE   2007 , Volume 1 , Number 2; Page(s) 87 To 94.
 
Paper: 

EVALUATION OF MAXIMUM WATER REQUIREMENT IN THE DIFFERENT RETURN PERIOD

 
 
Author(s):  SHARIFAN HOSSEIN*
 
* GORGAN UNIVERSITY OF AGRICULTURE
 
Abstract: 
Estimating of crop water requirement (ET) is one of the important parameters in the designation process of irrigation systems. If in this process, mean amounts of the evapotranspiration for a several years period are being used based on the meteorological data, then the occurrence probability of that will be 50%, while it is possible that the plant will face a water challenge (stress). Therefore, in order to prevent such a problems, it has been suggested to estimate the evapotranspiration rate with different probabilities so that based on the plant geaus and agricultural management, the ET with the paper occurrence probability can be chosen and then used in the designation process of the irrigation systems. In this paper, using data from Hashem-Abad Synoptic station, Gorgan, ETo and ETp of the main agricultural products of the region for every julian day of the year in the long-term has been computed. Then, through the moving average method, the beginning and the final data of water requirement maximum circles (1 to 30 days) were been defined and Log-Normal distribution, ETo and ETp with different probabilities for these circles, were estimated. Analysing ETo and ETp amounts with different probabilities revealed that by increasing the irrigation circle the mean daily evapotranspiration decreases. Also for a specific circle by increasing the probability level, the mean daily evapotranspiration increased.
 
Keyword(s): WATER REQUIREMENT, ETO, ETP, PROBABILITY, GORGAN
 
References: 
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