Abstract
This study aims to examine the effect of embankments for expanding double rice cropping area in the Cambodian Mekong Delta, where many traditional embankments called Tum Nub. For realizing double rice cropping in the flood plain, securing the cropping period and irrigation water during non-submerged days is essential, for which utilization of Tum Nub is considered to be effective. The field investigation revealed that some villages are practicing double rice cropping by introducing early rainy season rice. Hence, for introducing early rainy season rice, the effect of combination of two types of embankments was simulated for a target area selected: Type 1 embankment is making a reservoir for storing water, but single rice cropping is allowed in the inside of the reservoir after consuming stored water; and Type 2 is that for delaying the start of inundation. The result of the simulation showed that the combination of the embankments can increase rice production of the target area by 24-30% from the current level.
