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Accueil du site → Master → Pays Bas → 2012 → Optimisation of the design of diversion structures in a spate irrigation scheme : case study of Gash Agriculture Scheme in Sudan

UNESCO-IHE Institute for Water Education, Delft (2012)

Optimisation of the design of diversion structures in a spate irrigation scheme : case study of Gash Agriculture Scheme in Sudan

Tsoka, J.

Titre : Optimisation of the design of diversion structures in a spate irrigation scheme : case study of Gash Agriculture Scheme in Sudan

Auteur : Tsoka, J.

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

Grade : Master of Science (MS) 2012

Résumé partiel
Spate irrigation involves harnessing of flood water through diversion works for crop production. It contributes to growth of local communities and improved livelihoods. To date, the area under spate irrigation in the world is estimated to be around 3 million ha.The success of any spate irrigation system is dependent on the design and operation of its diversion works since they have the key role of abstracting water and channelling it towards the fields. This study was carried out in the GAS in Kassala state in Sudan. The GAS has an irrigationcommand of 50 000 ha and an irrigation potential of 100 000 ha. The scheme consists of sevenmain canal systems which supply water to the six agricultural blocks (Kassala, Makali, Degain,Tendelai, Metateib and Hadaliya blocks). The main canals draw irrigation water from the Gash River through masonry head-works. The capacity of the main canals range from 10 m3/s to 48m3/s and the water slope varies from 1 m/km to 0.4 m/km. The total length of the canal systems is 330 km and water is regulated by 234 different types of structures. Agricultural land is divided into 213 misgas (basins), the average area of each being 546 ha. Each misga is irrigated by amisga canal which abstracts water from the main canal through brickwork off-takes which are regulated by stop-logs. A general assessment of all diversion structures in the GAS was done, and was preceded by an in-depth investigation of Fota diversion structure and canal system in the Kassala block. Out of the seven canal systems in the scheme, the reason for Fota system’s selection was its poor performance. The diversion structure abstracts less than 9.4 m3/s discharge in an average flood and the canal system has poor water distribution, which has led to a significant reduction in irrigation command. These problems have existed for over 30 years and the local authorities are in need of a practical solution. Considering the aforementioned problems, the aim of the study was to come up with an optimized design of the Fota system

Sujets  : spate irrigation irrigation schemes optimization design canals case studies Sudan

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