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An experience in estimating evapotranspiration using lysimeter in Hapugala, Sri Lanka

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conference contribution
posted on 12.02.2018 by T.N. Wickramaarachchi, K. Sharmila, A.A.K. Lakmali, P.M.M. Vipulaguna
Efficient planning of water resources requires accurate evaluation of all components in the water budget. Evapotranspiration is an essential component of the water budget and the correct estimation of evapotranspiration is vital for improved water resources management. This study discusses about estimation of evapotranspiration using a simple technology which is economically viable for developing countries. In this study, daily reference evapotranspiration (ETo) was estimated based on the measurements from a non-weighable drainage type lysimeter. ETo estimations by Blaney Criddle, Radiation and Penman methods were compared with ETo estimations by the lysimeter measurements. It is revealed that the lysimeter estimations were overestimating the ETo during the months of February, March and April in year 2008 by 24%, 12% and 11% respectively compared to ETo estimations by the Penman method. Reasons for the above overestimations were discussed and recommendations for reliable ETo estimations by lysimeters were presented in relation to lysimeter design, installation, operation and maintenance.
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  • Architecture, Building and Civil Engineering

Research Unit

  • Water, Engineering and Development Centre (WEDC)

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WEDC Conference

Citation

WICKRAMAARACHCHI, T.N. ... et al, 2011. An experience in estimating evapotranspiration using lysimeter in Hapugala, Sri Lanka. IN: Shaw, R.J. (ed). The future of water, sanitation and hygiene in low-income countries - Innovation, adaptation and engagement in a changing world: Proceedings of the 35th WEDC International Conference, Loughborough, UK, 6-8 July 2011, 6p.p.

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© WEDC, Loughborough University

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VoR (Version of Record)

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This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

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2011

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This is a conference paper.

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WEDC_ID:13377

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en

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