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This paper shows updated results about Colombian water resources and their requirements by the economic sectors. Water demand/water availability relationship is used as a pressure index on water resources; this relationship is expressed through the water scarcity index, which applies constraints over water availability, due to the runoff temporal variability and to the low levels of water during the dry season, each year, and for each geographic region. To characterize average and low runoff years, different water availability scenarios were build: one for modal runoff values, and another for 95-percent exceedance probability flows. An outlook of water availability and water requirements for 2025 also was prepared. The results call our attention to problems caused by the concentration of high density settlements and the presence of economics sectors in regions with low water availability. The infrastructure lag for management of a scarce, highly variable and over pressured resource, emerges as a key factor to avoid a looming crisis in the process of water management.
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