Drinkwater network of the province of North Holland (Netherlands)

Period:	2009-2009
Location:	The Netherlands
Client:	PWN

assignment/short description

PWN is the main drinking water company of the province of Noord-Holland. They are increasing the capacity of their networks to meet future demands. Therefore, PWN has upgraded two pumping stations. To ensure safe operation with the increased capacity, they have requested Deltares to carry out a surge analysis to verify whether the existing surge protection is sufficient for the entire network.
For this project, three hydraulic Synergy-based models of the drinking water network were imported into WANDA, the pipeline hydraulics software package, developed by Deltares.
The largest model, which includes the complete region of North Holland between the cities of Egmond, Hoorn en Den Helder, contains 1650 km of pipeline in 1570 individual pipe components.
Furthermore, the model includes:

• three pumping stations with a total of 12 pumps
• three booster station with a total of  5 pumps
• 997 supply nodes with a total demand of 10,393 m3/h

The figure below shows an overview of this model. The results showed that for one pumping station, the surge protection was sufficient. For the other pumping station adjustments to the surge protection was required.