Prat Christian auteur aut IRD text conferencePaper spa text/pdf reformatted digital access In the UE-ORSTOM-CP-UAT-UG research program about rehabilitation of Mexican tepetates, one of the problems is to control soil erosion and productivity of these new soils. The caracterization of rainfall in relation to its occurence, quantity, energy, etc. is fundamental. This paper shows the results of the analysis of 4 years of precipitations measured with a pluviograph on the study area, and the processing of these data with soft-wares pertaining to ORSTOM (PLUVIOM and ARES). In spite of the short time of the registrations, we could show that the climate is C(w1)(w)-subhumid temperature with an ustic hydric regime in the classification of Koeppen modified by G. Benavides, as other authors have previously showed, but the total precipitation level for the agricultural season is much lower than what was considered: 620mm/year instead of 700/800 mm/year. With this amount of water, we cannot really expect a very corn high production. In relation to the agressivity of the rain, all the rains give a total value of a Rus. Due to the very brief duration of the rains, the maximum intensity during 5,10 or 15 minutes should be taken as a reference instead of 30 minutes to calculate the R coefficient. The variability of the events is very high during the same year and between years, difficulting the comparison of agronomic studies. (Résumé d'auteur). specialized PRECIPITATION AGRICULTURE AGROCLIMATOLOGIE EROSION CLIMAT METHODOLOGIE VARIATION TEMPORELLE GEOSTATISTIQUE TEPETATE ABATTEMENT DE LA PLUIE MEXIQUE 062REGHYD02 Suelos Volcanicos Endurecidos, 3., Quito (ECU), 1996/12/9-14 359-370 Zebrowski Claude ed. edt IRD Quantin Paul ed. edt IRD Trujillo G. ed. edt IRD Villamar M.D. collab. clb IRD Quito (ECU) UE Quito (ECU) ORSTOM Quito (ECU) PUCE Quito UCE 1997 https://www.documentation.ird.fr/hor/fdi:010012923 [F A010012910] https://www.documentation.ird.fr/hor/fdi:010012923 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/divers2/010012923.pdf IRD - Base Horizon / Pleins textes 1998-03-03 2013-07-31 fdi:010012923 fre