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UNESCO-IHE Institute for Water Education, Delft (2019)

Security and safety of micro-storage structures in the lower Zambezi River Basin : Case study Tete, Mozambique

Kawera, Bernadette

Titre : Security and safety of micro-storage structures in the lower Zambezi River Basin : Case study Tete, Mozambique

Auteur : Kawera, Bernadette

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2019

Résumé partiel
Micro-storage structures have been used to store and allow use of water during dry season when water is rare. This is one of the mechanisms to help water stressed areas to adapt to the hydrological variability, possibly aggravated by climate change phenomena, especially in rural dryland areas of Africa and Asia. Widely, where these structures exist, their utility, serviceability and maintenance during their intended life span are among the major challenges. The problems associated to this arise out of lack of clear criteria for design, construction, operation and maintenance of these facilities as well as faulty planning and lack of resources. This research focused on Tete province as case study located in Mozambique, and set out to investigate the security and safety of micro-storage structures which include : sand dams and weirs with surface reservoirs. The safety relates to the structural resilience of the dams whereas security relates the extent to which they serve the intended purpose. Field work was conducted in the research area where multidisciplinary data were collected. The evaluation of the adequacy of the structures to the local communities was carried out through interviews in terms of water needs, operation mechanism and procedures. Geotechnical assessment including sediment sampling and granulometric analysis, water retention and extraction capacity test on sand material were done to assess the particle size distribution, sand porosity, the amount of water that can be extracted in sand material and possible issues related to sedimentation. The hydrological analysis was done. The runoff was determined using SCS- curve number method, intensity duration curve (IDF) was obtained from rainfall data collected and the rational method was used to determine the design discharge that informed the hydraulic design of the spillway. Hydraulic investigations regarding auxiliary structures, the existence of seepage protection structures, the capacity of micro- storages in terms of volume of water and design parameters, dimensions and drawings of micro-storages were carried out.

Sujets  : water storage hydrological data dams Mozambique

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Page publiée le 14 avril 2021