It is essential to know the streamflow behavior in hydrological basins for appropriate water resource planning and management. In Colombia, where there is a considerable water resource potential, there is a need to generate hydrological modeling for many ungauged catchments. Thus, this study presents the regionalization of flow duration curves (FDC) in Colombia. Daily flow time series from 655 gauging stations were used to define homogenous hydrological regions, considering geological, topographic, and climatic information. Fifteen hydrological regions were delimited by cluster analysis using the K-means algorithm, all of which exhibited high spatial heterogeneity. Multiple linear regressions were used to estimate characteristic dimensionless flows as a function of each basin's attributes. A set of equations that allow the reconstruction of simulated dimensionless FDC for each cluster was determined, and regression (R2) values of 0.5–0.9 were obtained. The percentage error of the mean, maximum, and minimum discharge of the simulated FDC compared with observed values were approximately 9, 30, and 50%, respectively.

En el presente trabajo, se analizaron los cambios temporales en las curvas de duración de caudales CDC correspondientes a estaciones de caudales diarios en Colombia mediante la aplicación del test no paramétrico de Mann-Kendall, el Estimador de Pendiente de Sen y la pendiente de la regresión lineal de la serie. Se calculan caudales característicos con el fin de revisar tendencias a largo plazo entre distintas magnitudes o porcentajes de excedencia (percentiles 95, 75, 25 y 1). De forma adicional, se estima la tendencia en la desviación estándar en ventanas móviles de 10 años. Se observan tendencias crecientes significativas en las regiones del occidente (Chocó) y nordeste (Bajo cauca) de Colombia, mientras que para tendencias decrecientes no se observa ningún patrón espacial. Se encontraron tendencias con magnitudes entre –0.0068 m3/s/día y 0.047 m3/s/día.