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Metropolitan Waterworks Authority (MWA) had been greatly affected by the flood disaster in October to November 2011. Overwhelming low quality water from the flooded Industrial Park and its surrounding communities overflowed the canal’s dyke and entered into the east bank raw water canal. As the result, MWA needed to increase the amount of chemicals to cope with such unacceptably low quality of raw water. Temporary dyke was also constructed along the canal with afford to stop low quality water to additionally enter into the canal. After the crisis, permanent scheme for protecting the entire length of canal from Bangkhen Water Treatment Plant to Samlae Raw Water Pumping Station is developed into the urgent plan. The objective of this paper was to studied appropriate flood protecting structures for raw water canal that optimized all requirements including limited time and cost. Additionally, the method of piling along the canal’s existing dyke that provided the minimum effect to slope stability was also of interest. Findings could be drawn as follows; The final solution for flood protection should be comprised of 3 main forms of structures including 1) light reinforced concrete retaining structure, 0.22×0.22×12 m L-shape pile, 2) reinforced concrete retaining wall, 0.35×0.35×14 m I-shape pile, 3) compacted clay dyke. Having been finished, these structures were expected to effectively provide sustainable protection to east bank raw water canal as well as provide acceptably improved canal’s stability.
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