Have you ever noticed a sudden drop in water pressure at home or in a nearby building? Or perhaps heard about a water line break that cut off service to an entire neighborhood? In most cases, the cause goes back to mistakes made right from the start during the water network design phase. This phase is the foundation everything is built on — and when it shakes, the entire service shakes with it.
In this article, we walk you through the most common mistakes engineers and contractors make when designing water networks in Saudi Arabia, along with practical tips to help you avoid them from day one.
First: Underestimating Future Demand
One of the most costly mistakes in any project is designing a network based solely on current needs without looking ahead. Many areas across Saudi Arabia are experiencing rapid urban and population growth, and if the designer fails to account for this, the network will become a burden within just a few years instead of a solution.
How to avoid this mistake:
- Study the urban expansion plans for the area before starting the design.
- Use projected population growth rates over the next 20 to 25 years.
- Leave room in pipe diameters to accommodate increased future demand.
A good network isn’t just one that works today — it’s one that works efficiently two decades from now.
Second: Choosing Materials Unsuitable for the Local Environment
Saudi Arabia has unique climate and geological conditions: extremely high temperatures, saline soil in some areas, and sometimes groundwater containing chemicals that can affect pipes. Using materials that are not suited to this environment significantly shortens the network’s lifespan and drives up maintenance costs.
How to avoid this mistake:
- Choose pipes made from corrosion- and heat-resistant materials, such as HDPE or PVC pipes certified for drinking water use.
- Conduct a soil and water quality study for the area before selecting materials.
- Make sure all materials used carry Saudi Standards (SASO) certifications.
Choosing the right material from the start saves you from costly repairs down the road.
Third: Neglecting Water Pressure Calculations
Balancing pressure within a water network is one of the most precise and critical tasks in water network design. Excessive pressure causes pipes and fittings to burst, while low pressure means water doesn’t reach users adequately — especially in elevated areas.
How to avoid this mistake:
- Use specialized hydraulic simulation software such as EPANET to verify pressure distribution across the entire network.
- Install Pressure Reducing Valves (PRVs) at transition points between areas of different elevation.
- Account for elevation differences between parts of the project, especially in hilly neighborhoods or valleys.
Balanced pressure means a smoothly operating network and satisfied users.
Fourth: Poor Design of Control and Isolation Points
Some designers overlook the importance of isolation valves and control points distributed along the network. When a fault or leak occurs, they end up having to shut off service to large areas instead of isolating the problem at a small point. This extends repair time, raises costs, and frustrates users.
How to avoid this mistake:
- Distribute isolation valves systematically so that the distance between valves does not exceed 300 to 500 meters in residential areas.
- Place easily accessible valve chambers above every main valve.
- Design the network as interconnected loops (Loop System) rather than dead-end branches wherever possible, as this allows greater flexibility in operation and maintenance.
A network with good control points is like a car with excellent brakes — you can handle it with ease even in the toughest situations.
Fifth: Lack of Accurate Network Documentation
Many water network design projects are executed without adequate documentation of pipe routes, diameters, valve locations, and connections. Years later, when another team comes for maintenance or expansion, they find themselves working completely in the dark — leading to excavation errors, damage to existing pipes, and costly delays.
How to avoid this mistake:
- Prepare accurate As-Built drawings after construction is complete, showing the actual dimensions of every component.
- Use GIS (Geographic Information Systems) to map the network digitally and link it to real maps.
- Maintain an operational log that is regularly updated to include all maintenance work and modifications made to the network.
Good documentation doesn’t just protect the network — it protects the engineering team from unnecessary problems.
In Conclusion
Water network design is far more than drawing lines on paper or picking pipes from a catalog. It is a comprehensive engineering process that requires in-depth study of the environment, needs, and the future. In Saudi Arabia, where development projects are accelerating rapidly under Vision 2030, it has become more important than ever to build every project on solid foundations.
Avoiding these five mistakes from the start will save you significant time, effort, and money — and will guarantee a water network that operates efficiently and serves the community for decades to come. Always remember: investing in good design is far cheaper than paying for the cost of fixing mistakes later.