Estimation of Evaporation Loss from Minor Irrigation Tanks for Village Level Within the Ippala Vagu Watershed Region

IJEP 45(13): 1181-1187 : Vol. 45 Issue 13 (Conference 2025)

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J. Rangaiah1*, V. Mallikarjuna2 and P. Udaya Bhaskar3

1. Lakireddy Bali Reddy College of Engineering (affiliated to Jawaharlal Nehru Technological University Kakinada), Department of Civil Engineering, Mylavaram – 521 230, Andhra Pradesh, India
2. Siddhartha Academy of Higher Education (SAHE), Department of Civil Engineering, V. R. Siddhartha School of Engineering, Vijayawada – 520 007, Andhra Pradesh, India
3. Jawaharlal Nehru Technological University Kakinada, Department of Civil Engineering, Kakinada – 533 003, Andhra Pradesh, India

Abstract

Recently, changes in rainfall and temperature patterns have significantly hindered agricultural activities, reducing surface water availability in the Ippala Vagu watershed. Assessing evaporation from small irrigation tanks is crucial for managing water loss. While various methods exist to estimate evaporation from water surfaces, simplicity and suitability are paramount. Therefore, a straightforward equation is needed to accurately estimate evaporation using climatic data. Based on this requirement, a simple equation was developed through linear regression. Evaporation rates are estimated using Penman’s equation as a reference and then a linear regression equation is formulated. Comparing results from this linear regression with those from three other empirical equations shows that the regression model aligns more closely with Penman’s than the empirical ones. Finally, month-by-month evaporation losses from small irrigation tanks are estimated using the linear regression equation for each village in the Ippala Vagu watershed. Evaporation accounts for 34% of total water loss during the monsoon, 16% post-monsoon, 23% in winter and 27% in summer. These findings are highly useful for planning watershed activities.

Keywords

Evaporation loss, Minor irrigation tanks, Penman’s equation, Climwat 2.0 software

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