1HidroSIG: An Interactive Digital Atlas of Colombia’s Hydro-climatology

has been developed containing distributed maps and time series of monthly and long-term average precipitation, actual and potential evapotranspiration, and river flows, as well as temperature, humidity, radiation, land use, life zones and many other variables, as part of a more comprehensive geographical information system (GIS) and database. Maps were developed so as to capture the spatial variability of the diverse geophysical fields resulting from major geographic, topographic and climatic controls. HidroSIG allows diverse hydrological and geomorphological estimations including: (i) extraction and estimation of geomorphological parameters of drainage channel networks and river basins from Digital Elevation Maps (DEM), (ii) estimation of the long term and monthly water balances and multiple hydro-climatic variables in river basins, (iii) estimation of extreme flows (floods and low flows) of different return periods at any site along the river network of Colombia, and (iv) interpolation of geophysical fields using Kriging with drift, adaptive neural networks, and triangulation with topographic drift. All results are readily available merely by ‘clicking ’ on the requisite point. Here we describe the most relevant features of HidroSIG in terms of the methods employe