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Harderwijk                                                                                                                                               Table of contents

Harderwijk  depth of passage: 3 m / width: 19 m

 height of passage: unlimited

 3 tunnel tubes: 2 for motorised road traffic (headroom: 4,6 m) and 1 for a cycletrack. Depth of the Harderwijktube for motorised traffic: 8 m below Normal Amsterdam Level. For the cycletrack the depth is 6 m below Normal Amsterdam Level.

 footpath on both sides for those who want to enjoy the view.


Leidschendam/Voorburg (under the Vliet)

Vliet  total width: 30 m / total lenght 315 m (built with 14 pieces each of 22,5 m lenght)

 two tunnel tubes for road traffic (seperated by a tube which can be used as an escape route) and a tube for high-grade public transportation from and to Leidschenveen. The lowest part of the road: 9,5 m Normal Amsterdam Level. The water level of the river the Vliet is 0,4 m Normal Amsterdam Level

Vliet  depth of passage: 3,2 m

 approx. 1400 vibrocombi piles were drilled in an excavation site

 total amount of concrete used: 40.000 m3 (of which 14.000 m3 underwater concrete).

For your information: The Fossa Corbulonis was and is a canal between the Rhine and the mouth of the Meuse, between Leiden and Voorburg, the modern Vliet river. The Roman general Cnaeus Domitius Corbulo has built this canal in 47 (to prevent ships from crossing the dangerous sea).

Click here for more modern aqueducts in the Netherlands.
The Romans also settled in Nijmegen and Heerlen. Heerlen was then called Coriovallum.
Click here for more information about the Dutch Roman time....