Transport system

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About the transport system

In the northern part of the region of the Delfland Water Board eighteen pumping stations pump the waste water of almost 1.5 million people and 40,000 businesses through large diameter pressure mains to two waste water treatment plants, where is arrives as ‘influent’.

WWTP Houtrust in The Hague and WWTP Harnaschpolder in Midden-Delfland treat the waste water to become ‘effluent’, relatively clean water. The treated waste water from WWTP Harnaschpolder is pumped through two large effluent mains to the WWTP Houtrsut, about ten kilometers away. Together with the treated waste water from WWTP Houtrust, the total effluent is pumped, – with a maximum capacity of 50,000 m3 per hour – through an effluent main with a length of 2.5 kilometer, in order to discharge it into the sea, far away from the coast.