Agriculture stays the main activity of the populations of the Township of Ouaké. The yam, Dioscorea alata, a rustic plant to spilled vegetative multiplication of by the diversity of its cultivated shapes in the world, is the main culture of this township. This survey aims to analyze the systems of production of the yam in the township of Ouake. To reach this objective, the methodological gait supported on the documentary research, the interviews, the investigations by questionnaires, the treatment of the data and the analysis of the results. The sample is constituted of 189 chosen individuals of way reasoned and is distributed on 06 precincts of the township. The SWOT tool has been used for the analysis of the results.Of the results of the present survey, it comes out again among others, that the yam doesn't cultivate itself in a successive way on a same parcel and stand always at the head of rotation. This rotation of yam culture in the township of Ouake follows itself on two to three years the insufficiency of the arable earths. The production of the yam is always superior to the other speculations of 2006 to 2017. The season (2010 - 2011) recorded the strongest output (1285kg/ha) on a surface cultivated of 4749 ha. The different cultivated varieties are: the precocious varieties (Aloupa, Ankploman, Ekpètilè, HèAbalo, Walassi, Wotanam, Abota, Lalboko, Gbèm, Katala) and the belated varieties (Alasola, Ewotolo, Kokopo, Kpassa, Wolouchahabim, Toufou, Yelian, Loli, Djadjabiou, Adè, Agbantao, Adjanfa). The techniques of cultures remain always traditional. These techniques had negative impacts on the environment. Some measures have been proposed in this survey in order to improve the systems of production and the merchandising.

The only source of drinking water for the commune of Parakou is the Okpara River. This study lives to identify the constraints of surface water supply in the commune of Parakou. To achieve this objective, the climatic data (temperature and precipitation) of the synoptic station of Parakou and covering the period 1988-2018 are used to quantify and qualify the evolution of the climatic parameters. The sample consists of 118 individuals chosen in a reasoned manner and distributed over the three boroughs that account for the municipality through the technique of Neuchâtel (2014) called « snowball ». The data is processed using statistical tools (frequency, percentage, tables and graphic illustrations). The sample consists of 118 individuals chosen in a reasoned manner and distributed over the three districts of the municipality. From this study it appears that the average rainfall, from 1988 to 2018, of the town of Parakou is 1183.13 mm, which allows it to have a more or less permanent amount of surface water. However, supply difficulties exist. In addition, around 40 % of the population has difficulty obtaining drinking water. In addition, periods of water shortages occur in the dry season. This situation leads subscribers to alternately use several types of water.

In a world more and more marked with urbanization and then exposed to high risks of increasing yearly population growth, water has hold a paramount place. Water has then become a more and more vital need for people. This fact requires an important consideration in West Africa in general, and in the Nikki district in particular. Despite efforts over years for the mastery of techniques in setting up water fountains, an important part of the population of the Nikki district still lack water. The objective of the present research work is to work out those water fountains in order to evaluate their spatial distribution and their functioning. The methodology used here is exclusively based on the use of attributive and spatial data. To reach the goal of the present study, the Thiessen polygon has been generated. The obtained results have come together to display their spatial distribution and their functioning as well. The average rate of water provision in the district of Nikki is 57.2%, which is below the 67% norm. Only of the seven precincts that make the Nikki district have an average rate of water provision reaching 85%, which is largely beyond the norm. From those data, one can learn that water fountains are unevenly distributed on the land of the Nikki district. This must be improved in order to provide the population with potable water on short distances and with less waste of time for them.

The liquid waste refining station of the International Market of ARKEZE, which has three lagoon basins with microphytes, faces important development problems. Those problems include the low production of liquid waste, the plugging of the main water pipe - which usually results in olfactory nuisances, the frequent breaking of the pipes that drain the liquid waste to the station, the lack of maintenance of the station - which causes a high rate of mud in the anaerobic basin. This investigation aims at studding the hydraulic functioning and assessing the different basins. To that purpose, quality indication measures have been carried out for ten weeks on samples, some of which have been taken daily and others weekly. The liquid waste