Part 6/15:

Dams obstruct migratory fish routes, disrupt natural flow cycles, and alter sediment transport. The sediment trap behind reservoirs prevents fertile silt from reaching downstream deltas, particularly damaging the Mekong Delta in Vietnam and Cambodia. As sediment diminishes, so does the natural fertilization of agricultural lands, threatening rice production—an essential staple for the region. For instance, in the coming decades, Vietnam could see rice yields drop by over 2 million tons if sediment flow ceases.