ALGERIE, RECUPERATION DE L'EAU DE PLUIE

En Algérie, il est crucial de récupérer les eaux de pluies et de favoriser leur infiltration. A travers cette page nous nous proposons d'exposer des techniques qui ont fait leur preuve à travers le monde. Ces techniques peuvent être développées au niveau du bassin versant, du champs ou du lit de semences.

Le problème: retenir cette eau pour ne pas qu'elle aille se perdre et s'évaporer dans les chotts ou se perdre dans la mer.

Nous pensons que ce sont aux autorités locales, mais également aux agriculteurs et populations rurales de prendre des initiatives pour la saiuvergarde d'un bien commun: l'eau et le sol.

 

Nous proposons différents liens dont ce  livre en ligne: http://books.openedition.org/irdeditions/2863

Photo:Sétif.info





TECHNIQUES MECANISEES

Effective Mechanized Rainwater Harvesting: Coping with climate change implications in the Jordanian Badia

Le document qui suit est intéressant. Il montre comment, en Jordanie, avec une charrue et un appareil de lecture topographique on peut réaliser des pièges à eau de pluie selon les courbes de niveau et y planter de l'attriplex.

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Science IMPACTS  Success Stories

http://www.icarda.org/sites/default/files/u158/Science%20Impact%20Vallerani%20Badia_final.pdf

TECHNIQUES MANUELLES


Photo: Réalisation de cuvettes en demi-lune.

Photo: cuvette en demi-lune dans une oliveraie. Eric Roose.


Photo: Seuil en pierres sèches pour lutter contre le ravinement.
Sources:  http://www.ma.auf.org/erosion/chapitre1/VI.Lutte.html

 

ICARDA:

Water Harvesting: bringing water to communities

Scaling-up: This technology is suitable for both crop- and range-based production systems with the necessary topographical and soil/substrate conditions.

The biggest challenge in dryland agriculture is low and erratic rainfall. A new technology package is available that can help build effective, low-cost systems for harvesting rainwater. This will deliver larger and more stable water supplies for crops and livestock, even in very dry areas.

This technology has been tested in several countries including Syria, Jordan and Libya – three of the world’s driest regions. It relies on existing information – cadastral maps, supplemented with data on soil, topography and other factors. Using GIS analysis, scientists identify specific areas best suited for constructing water harvesting systems.

This method greatly reduces the time and cost of implementing water harvesting systems.

In Eritrea, ICARDA and its partners used a GIS model, adapted to data-poor environments, to produce a ‘suitability map’ of the Zoba Debub area, to assess the potential of different water harvesting techniques. This analysis showed that water harvesting potential in the project area (as in many dry areas worldwide) was much higher than previously realized.

In Jordan, a multi-component technology package (water harvesting plus other innovations) has helped rehabilitate degraded rangeland areas, reduce erosion, and improve the production of fodder for livestock.

Other proven interventions include:

Mechanized construction of micro-catchment to harvest rainwater

Planting indigenous fodder shrubs around water catchment ponds

Effective water harvesting even from very low rainfall events

Soil loss reduced by nearly 70%

Benefit-cost ratio up to 12:1