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Vrije Universiteit Brussel (2007)

Conflict between water demand and supply in the Tadla irrigation scheme (Morocco) : Actual situation and future trends

Hennebert Denis, Moerenhout Tim

Titre : Conflict between water demand and supply in the Tadla irrigation scheme (Morocco) : Actual situation and future trends

Auteur : Hennebert Denis, Moerenhout Tim

Université de soutenance : Vrije Universiteit Brussel

Grade : Master of Science (MS) 2007

Résumé
In many countries around the world, the concern about the performance of irrigation schemes keeps increasing. This is also the case for Morocco. In this research, a part of the Tadla irrigation scheme is analysed and an evaluation is attempted with the program WaDl, a model for evaluating the scheme or collective network water demand and supply. After a presentation of the context, the discussion focuses on the water demand and supply. The first step defines the different farm types, the water demand, and the different water resources as well as their use and distribution. This presentation helps defining the main challenges : the inability of WaDI to give meaningful results, the changes linked to the liberalisation of the cropping pattern, the difficulties to plan the irrigation scheduling, and the environmental problems due to the use of saline water. A calculation tool is explained and used to analyse present and future water demands, testing different trends in cropping pattern and irrigation techniques. It is calculated that the traditional cropping pattern gives good results for cereals, but the production of alfalfa is more difficult due to the irrigation amount and interval of the Office. An interesting improvement if farmers can find some capital is the levelling of the land, enhancing the irrigation efficiency. The introduction of maize in the winter gives also interesting yields for a traditional farm. The introduction of vegetables and fruit trees does not work as long as the farmer does not invest in a pumping station and a reservoir (for blending the water), which are the basic requirements for a constant adaptation of the irrigation planning to the climatic conditions. The evolution of the soil salinisation is discussed for different uses of water resources, for the traditional farm type. It can be concluded that, as ground water is saline, this water resource has to be blended with water from the Office, of good quality. The water quality, the number of irrigation applications, and the amount of rainfall clearly define the degree of salinisation.

Présentation (Agritrop Cirad)

Page publiée le 31 octobre 2015, mise à jour le 23 janvier 2018