Hydrological effects of large dams in Chilean rivers

Eight rivers regulated by large dams located in three hydro-climatic zones along the Chilean latitudinal gradient. We performed a multi-temporal scale analysis of flow records and we used data from official gauging stations to characterise non-altered altered river regimes determine magnitude persistence hydrological alteration downstream Chile. These analyses provide relevant information improve understanding such alterations, conceptual basis for assessing future impacts as country plans build series coming years. The mean annual runoff was reduced all study rivers. monthly flows northern arid zone were most affected dams. frequency floods decreased Moreover, drier systems did not recover their conditions distance dams, probably due transmission losses water extractions diversions; contrast, southern partially recovered with downstream, mainly inflows permanent non-regulated tributaries. So far, this is first Chile that comprehensively effects