# Clearance work in the Merwede Canal

By means of a drainage sluice at Zeeburg, canal water from Amsterdam is discharged into the IJsselmeer and fresh water is taken in from there. For the exchange of water flows there are nine long metal tubes on the bottom of the Merwede Canal, called syphons, which are no longer in use. However, now that the Merwede Canal will be widened and deepened to accommodate increasing shipping traffic, the syphons may become an obstruction and will be removed. SHOTS: - a tugboat brings a floating sheerlegs to the lock; - in the lock, a diver goes into the water to attach mooring lines to the tubes underwater, assisted by workers on a flat deck barge; - the floating sheerlegs slowly hoists the tubes up and places them on the shore.

- Kind: Film
- By: Polygoon-Profilti (producent)
- Archive: [Europeana](https://www.europeana.eu/item/2051906/data_euscreenXL_https___www_openbeelden_nl_media_654535)
- Licence or status: [Public Domain Mark 1.0](http://creativecommons.org/publicdomain/mark/1.0/) (as the archive states it)
- Credit: Netherlands Institute for Sound & Vision
- Who can watch: Teens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

Not offered: its uploader or archive marks it public domain, and nothing the site holds bears that out (its record gives no year, or a year from 1978 on, which no US term has left), so where it is free is not known. Unclear is not offered.