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The document evaluates the impact of planned hydroelectric expansion in Colombia's Magdalena River basin on the Mompox Depression, one of the world's largest wetland systems. Using an enhanced Water Evaluation and Planning (WEAP) model, the study finds that while new dams may not prevent extreme floods, they could significantly alter seasonal and low flows, threatening biodiversity and ecosystem services. It also warns that reducing connectivity through flood-control structures like dikes could increase peak flow magnitudes downstream, potentially raising flood risks for urban areas like Barranquilla.

The document examines how increasing the Degree of Regulation (DOR) through hydropower dams in the Magdalena River Basin affects the Mompos Depression. While current regulation is low, the addition of 30 planned projects could increase the DOR from 5% to 30%, significantly altering seasonal and low flows critical for biodiversity. The analysis finds that these dams would not protect against extreme floods, as safety releases during peak flows are necessary, and that reducing lateral connectivity via levees could increase peak flows downstream in cities like Barranquilla.