J. Sujono (Indonesia)
Water saving irrigation, water productivity, flood reduction
Currently the demand for water resources has increasing as a result of population pressure and industrial developments. Competitions among different users have emerging especially during dry season where water availability is continuously decreasing. About 80% of the available water resources are used for agriculture purposes. For saving water, water saving irrigation technique (WSI) that gives high water productivity, affordable and applicable for rural area and rural people is highly demanded. Number of WSI are applied for paddy rice cultivation i.e. SWD, AWD, SDC and modified traditional method (TRI-2). The performance of those methods in terms of agronomic and water parameters is compared to the control method i.e. traditional flooding method (TRI-1). Effect of paddy fields under different WSI for flood peak and volume reduction will be discussed. Results show that due to limited water supply using WSI, much water can be saved. SDC needs 29% less water than TRI-1 whereas SWD, AWD and TRI-2 need 20%, 17% and 24% less water than TRI-1, respectively. As a result, water productivity increased by 31% (AWD) and 47% (TRI-2) compared to TRI-1. Flood routing analysis show that paddy fields is also very effective in flood reduction both flood peak and volume.
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