State of hydraulic infrastructures following successive floods in the irrigated area of aneker-tahoua-Niger

This study was carried out on the irrigated area of Aneker, Tahoua region (Niger), the objective of which is to analyze the physical state of hydraulic structures following flooding on this development. Its objective is to make an exhaustive diagnosis of the irrigation and drainage networks. The methodology consisted of the development of two (2) survey sheets, one of which was administered to irrigators and the other with ONAHA technicians. The other was used to explore a certain number of hydraulic works such as irrigation canals, protection and drainage networks, in order on the one hand to assess the physical state of these works and on the other hand to complete data collected with operators and technicians.Thus, the collected data was processed and analyzed. The results of this study show a notable deterioration of hydraulic infrastructure which affected the operating performance of the study area and development. It emerges from this study that the perimeter is faced with the problems of cracking observed on the canals, the lack of seals, the degradation of the jumpers, the presence of termite mounds, silting of hydraulic works, grassing of canals and drains. , the putting into operation of the drains. All of these problems have been observed to some degree.Thus, the water mobilization works of which 65% are in a state of siltation or even cracked and 35% are in good condition, the main canals present anomalies of which most of the latter are either broken, detached, loosened, cracked or good. The secondary canals mainly present cracks, weeding, defective seals and the degradation of the valves to a very poor degree while the degradation of the jumper and the presence of termite mounds are to an average degree. On tertiary canals, the most observed constraints are sand encroachment, cracking, degradation of valves and breakage of panels to a very poor degree while grass cover, presence of termite mounds and degradation of rider to an average degree.... For the Aneker perimeter to function well, it would be interesting to review the design or to consider the rehabilitation of certain hydraulic infrastructures.