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2008

Management contract regarding the provision of drinking water and wastewater management services in the provinces of Annaba and El Tarf, Algeria

Algérie

Titre : Management contract regarding the provision of drinking water and wastewater management services in the provinces of Annaba and El Tarf, Algeria

Pays : Algérie

Lead executing agency : Société de l’Eau et de l’Assainissement d’El Tarf et d’Annaba – SEATA (Annaba water authority, Algeria)

Commissioned by : Gelsenwasser AG

Overall term : 2008 to 2013

Context
Drinking water supply and sanitation systems are currently being overhauled in large Algerian towns and cities. In this context, Gelsenwasser AG and the Algerian client SPA SEATA signed a management contract for a term of five and a half years in 2007, covering the provision of drinking water and wastewater management services in the provinces of Annaba and El Tarf.
This region in the northeast of the country is home to around one million people living in 36 communities. Besides the overall aim of increasing water supply, little is being done to renovate and improve water supply networks. Most of these networks are in an extremely poor condition. It is not unusual for more than half of water production volumes to be lost as a result. The water collected in the project area consists of 70 % surface water and 30 % groundwater.
Water supply is currently largely intermittent in nature, and the population cannot be guaranteed a continuous water supply. Smaller communities and some urban districts, in particular, are supplied with water only once or twice each week. These leads to biological contamination of water when it is, for instance, stored in household containers. Ultimately the result is inadequate drinking water quality

Approach
GTZ International Services and its partners are establishing a geographical information system (GIS) and plan to conduct mathematical modelling and system analyses for the water supply network.

Geographical information system
1. Geo-referencing the existing topographical maps
2. Vectorising topographical maps and devising digital terrain models
3. Drawing up aerial view plans for the individual locations and identifying hydraulic plants, their geometry and specific hydraulic characteristics
4. Recording a network of geodesic reference points and integrating site data for the hydraulic plants using GPS
5. Measuring supply lines for the main distribution line and localities
6. Transferring data to the EPANET programme

Mathematic modelling
1. Data transfer, verification and collection
2. Network analysis and rehabilitation planning
3. Completing models and hydraulic support for network operators
4. Drawing up models, handing over models and training experts

Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ))

Page publiée le 28 février 2011, mise à jour le 16 juin 2019