Amman:
Rehabilitation of Greater Amman’s Water Supply System, Amman II Programme

Disciplines

  • Hydraulic Engineering
  • Water Supply

Companies

Dorsch International Consultants

Client

Ministry of Water and Irrigation (MWI), Water Authority of Jordan (WAJ)

Duration

From 1997 to 2008

Project Activities

  • Detailed design including hydraulic modelling and detailed construction drawings
  • Preparation of packaging report
  • Preparation of tender documents including conditions, specifications and BoQ
  • Prequalification of suppliers
  • Assistance to Client during tendering process
  • Evaluation of tenders
  • Construction supervision including complete technical, financial and administrative assistance to the Client
  • Final reporting after construction

Contact

Dorsch International Consultants GmbH

München (Headquarters)
Landsberger Str. 368
80687 München
Germany

Phone: +49 89 5797-0
Fax: +49 89 5797-800
E-Mail: info@dorsch.de

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Description

Because of the scarce water resources available for municipal water supply in Jordan, physical water loss reduction is of vital importance for the Water Authority of Jordan.

The Amman II water facilities rehabilitation programme focuses on reducing these losses through network optimisation, i.e. hydraulic modelling, zoning and restructuring, pressure management, network rehabilitation and leak detection/ repair.

Reduction of water losses contributes to the target of reducing specific operational costs, as a higher percentage of the water produced will then reach the consumers and generate higher revenues for WAJ.

This so-called open programme is co-financed by the KfW and, at the beginning, only offered tentative commitments with respect to certain physical activity zones.

All distribution zones for which re-structuring and rehabilitation measures were proposed and all works on the primary system were designed and approved by the KFW before tendering.

For the works under this programme, the densely populated centre of Amman city was selected, consisting of seven distribution areas, covering 50 km2, and serving a population of almost half a million.

The engineering works of the present contract are divided in two stages, namely 

Stage I

Engineering design and preparation of tender documents:

Due to the complexity of the task and the requirement to deliver structured, digital network data, an integrated approach linking hydraulic modelling software (Pipe2000), GIS (ArcView) and the automated generation of bills of quantities for all civil works and hydraulic fittings was developed.

Stage II

Construction supervision during the implementation stage.

Four contracts are executed involving:

For Restructuring

Pipelines of

  • DN900 8.0 km
  • DN700 1.0 km
  • DN500 4.5 km
  • DN400 to DN200 156 km

RC reservoirs

  • new: two of 10,000 m3
  • new: two up to 4,000 m3
  • rehabilitated: one with 500 kVA

Pump stations

  • new: one with 500 kVA entirely remodelled and equipped: four with up to 1,000 kVA

For Rehabilitation

  • Pipelines of: DN100 and smaller 308 km, including house connections, excluding GI pipe installations
  • Well fields: rehabilitated and equipped: three with a total of 25 wells