This report focuses on the flooding problems in the Lower Moshi area, Tanzania. These floods are the result of the extremely large catchment of the Kilimanjaro region in combination with large peaks in precipitation during the short and the long rainy seasons. The river bordering the area of interest cannot handle these quantities of water which results in the flooding of large plains. The local self-sustaining communities cannot harvest their crops during these seasons complicating their living conditions. Furthermore, essential facilities such as schools and medical care become unreachable during the floods and they lead to diseases being spread and an overall reduction of sanitation. Apart from their negative effects they also have positive outcomes however. The floods decrease the salinity of the soil of the agricultural land by flushing it, thus making it more fertile Last year a group of students from TU Delft came to the Lower Moshi area to investigate the cause of the flooding and come up with solutions. The report from the previous group is referred to as the prefeasibility study. This year the client, FT Kilimanjaro, made the request to work out their solutions in more detail and come up with a cost estimate. The goal of this project is to improve the welfare in the Lower Moshi area by developing a technical solution that prevents the short rain flooding and regulates the long rain flooding which is socially acceptable, feasible, and durable.