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Dar Al-Omran meets Zarqa water project deadlines

Given that this project involved the design of approximately 600 kilometers of new and replaced pipeline, the development of detailed design and tender drawings was a major challenge

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Zarqa and Ruseifa water network models shown in Google Earth
Zarqa and Ruseifa water network models shown in Google Earth
Hourly pattern for intermittent supply shown in WaterCAD’s pattern manag...
Hourly pattern for intermittent supply shown in WaterCAD’s pattern manag...

The Zarqa Governorate is located to the northeast of Amman, Jordan. To meet the needs of the growing population (projected from 871,600 to 1,690,000 by 2030), and to address limitation in the current water network, the Millennium Challenge Corporation is funding a major restructuring of the network, with a transition away from direct pumping into supply. The joint venture of Hazen & Sawyer, Dar Al-Omran, and Nicholas O’Dwyer Ltd, were commissioned to progress the detailed design of the works. The team used Bentley’s WaterCAD for all hydraulic modeling works.

Major Issues Include Intermittent Water Supply and Water Leakage

Because of inadequate water resources and high levels of leakage (especially in the tertiary pipe network), supply was available to consumers on an intermittent basis, about 22% of the time.

Most of the network was supplied by direct pumping from low-level sources and pumping stations rather than by gravity from elevated reservoirs, which is more efficient. With hydraulic capacity inadequacies throughout the system, and supply and water pressure imbalances across the system, the main objective of this project is to improve the hydraulic efficiency and performance of the water supply network, including:

• Reducing water loss (reducing the water that needs to be pumped)
• Reducing operation and maintenance costs for the water supply network
• Increasing revenue due to improved availability of supplied water.

WaterCAD Facilitates Meeting the Design Deadlines

A fast-track project strategy was adopted to enable the completion of all construction and commissioning works before December 2016, an immovable client deadline. Emran Hammoudeh, head of the Water & Wastewater Design section at Dar Al-Omran, explained: “WaterCAD was instrumental in ensuring that extremely tight deadlines and project milestones were met by the project team and facilitated the development of cost-efficient solutions for a very complex water supply system.” – more specifically:

• Interoperability between WaterCAD, AutoCAD, and ArcGIS allowed the efficient transfer of existing GIS and network data into the model.
• WaterCAD’s TRex allowed the allocation of elevations to specified nodes based on data from a digital elevation model; resulting in a 10-15% savings in time and resources in the model-building process.
• WaterCAD’s LoadBuilder facilitated the efficient allocation of demands across the nodes.
• WaterCAD allowed the efficient development and management of four scenarios within the same model: simulations over 24 hours were required for both the continuous and intermittent supply arrangements and for both average day demand and average day peak week demands.

Streamlined Tender Drawing Development

Given that this project involved the design of approximately 600 kilometers of new and replaced pipeline, the development of detailed design and tender drawings was a major challenge. The interoperability between WaterCAD and AutoCAD enabled efficient generation of drawings based on the water model, and minimized the possibility of data transfer-related issued, resulting in about a 20% time savings, when compared to more traditional processes.

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