commented on the modeling natural rivers flow and the peculiarity of representing a watercourse and flow "Newtonian", ie where the shear stress is directly proportional to the rate of deformation of the fluid, a river is right for such approximation. If we refer to the behavior of a stream and geodynamic conditions typical in river canyon in the Andes, sediment transport and rheology of the sediments, requires the application of fluids "non-Newtonian." One of the packages that allow such representation at FLO 2D, which was applied to the stream Paihuén (Matucana-Lima), one of the most difficult to handle broken on the issue of debris flow and currently broken system continue to affect surrounding one of the most important transportation corridors in Peru such as the Central road and rail concerned. Attached presentation by Mr. Leonardo Castillo, who graciously offered on the 1st Symposium on Floods and landslides, conducted in March 2007 (Lima-Peru) organized by the Institute for the Mitigation of the effects of El Niño (IMEF - UNI) .
Fig 1. FLO 2D model application and determination of hazard maps. 
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