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In this study, the results were evaluated of the application of the meteorological model Weather Research and Forecasting (WRF) in 103 days where extreme precipitation events (90th percentile) occurred within the Mantaro River basin. The WRF atmospheric model was used for four areas through nesting multiple, and spatial resolutions of 18, 6, 3 and 0.75 km, respectively, were obtained. Extreme precipitation forecasts were made and the effectiveness of the numerical outputs was evaluated, using observed data {\emph in-situ}, through the SENAMHI weather station network and satellite information. The values of statistical estimators show that the model tends to underestimate the rainfall data in many cases and overestimates it in others, having limitations in representing the spatial variability of the observed data. Accumulated precipitation satellite data always overestimates precipitation...

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This document studies the stabilization of the soil used as a subgrade, by adding locally available materials such as rice husk ash (RHA) and sugarcane bagasse ash (SCBA). These aggregates were added to the soil in substitution by weight between 5%, 7.5% and 10%. By adding these, the expansiveness is reduced while the maximum dry density increases, in addition the tendency of CBR is increasing and then tends to decrease proportionally to the addition of the aforementioned aggregates. This indicates a peak in CBR and expandability. The best result obtained from CBR was 33.75% with the 5% replacement mixtures.