[mch2021-terrain] Duikers

[Bart de Waal]

I've uploaded a map with the duikers highlighted in yellow.

https://cloud.ifcat.org/index.php/s/CDaEk9ttG98339e

This is just the government data, I make no guarantees about it's reality.

As Rox mentioned, there are also some trenches under the road.

My understanding was that the question was mainly about duikers under 
the Wagenweg.

I had a look in real life for this, before I got the government data. I 
didn't spot the one, so it's probably small or underwater.

  -- Bart / Uglyhack