Modeling water balance components in rice field irrigation
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Date
2006-12Author
Lee, Teang Shui
M., Aminul Haque
Huang, Yuk Feng
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In this study, a water balance equation approach was applied to the irrigation practiced at the Besut Rice Irrigation Scheme.
Each component of the equilibrium equation, where not measured, was modeled using equations sourced from the literature.
Results obtained from the modeling exercise were compared with measured data whenever available. The reference
evapotranspiration (ETo) modeled with the Penman-Monteith equation for the monthly time series; was evaluated to be 3.6
mm/day and 3.5 mm/day for off-season (May – October) and main season (November – April) crops respectively. Effective
rainfall was estimated using the water use-rainfall ratio method, with monthly rainfalls data from 1951 to 1998, for three
rainfall stations. It has been observed that 68% and 54% of rainfall accounts as effective rainfall during the pre-saturation and
crop growth periods respectively. The water subsidence technique was used to estimate the average daily seepage cum
percolation rate, and results showed this to be 2.4 mm/day for the site. Comparisons between model component outputs and
observed and recorded field data are good. The water balance components can be adequately used to monitor field conditions
for rice irrigation in Malaysia.
URI
http://myiem.org.my/content/iem_journal_2006-177.aspxhttp://dspace.unimap.edu.my/123456789/13731
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- IEM Journal [310]