In the optics to impregnate themselves of the realities concerning hygiene and purification in the township of Allada in Benin, 600 chiefs of household identified by probabilistic sampling have been interviewed in order to study the relative indicators of hygiene and purification. Besides, a qualitative approach consisting in an observation of the women having in charge of the children of less than 5 years has been adopted in order to document the different convenient concerning manipulations of the stools. It is evident from this survey that the level of hygiene and purification is relatively weak in the township of Allada. A total of 69.5% of the households has access to the drinking water and only 37,2% of the households have latrines at home. The worn-out waters and the strong garbage (except 21,2% collected by the non-government organization of pre-collection) are rejected directly almost in the nature by the - totality of the households. This survey demonstrated a tie between the type of dwelling and the existence of latrine (p <10-5), as well as a tie between the level of instruction and purification (p <10-5). Also, a link exists between the religious factor and the existence of latrine by the families (p <10-5). On the other hand no tie has been put in evidence between the religious factors and the knowledge of the illnesses bound to hygiene and purification (p=0,004).

The present research aims to study the variability of the NDVI in the step of annual times in the catchment area of Upper Ouémé between 2000 and 2015. Vegetation Index data is analysed to highlight the spatial variation time of vegetation. The MODIS 250 m resolution are used to analyse the details of the dynamics from 2000 to 2015. Generally, vegetative activity in the Upper Ouémé, declined during the 2000-2015 time series. The spatio-temporal dynamics of vegetation brought together the months of the year, according to homogeneous dynamics. So some months, like those of July-August, are marked by a significant improvement in the vegetation. Others, contrariwise, knows a reverse situation. These are the months from November to February. The Pettit test applied to the series of NDVI MODIS shows that between 2000 and 2015, the data are not homogeneous and that there are dates from which the changes were observed in the data. The year of greater plant production is 2003. As for the year to the smaller plant activity, it corresponds to 2005.