To visualize this dataset N&S&Deltares created a website:
http://test.kustviewer.lizard.net/kml/viewer
Sourcecode of the application:
https://github.com/lizardsystem
https://github.com/lizardsystem/lizard-kml
https://github.com/lizardsystem/lizard-kml/tree/master/lizard_kml/jarkus
https://github.com/lizardsystem/lizard-kml/blob/master/lizard_kml/jarkus/nc_models.py


The grids files are not all valid arcinfo grid files

examples of invalid files:

This comment line is valid in c but not in a grid file
KB112_4544_20070101.asc
/* arc grid file created by Matlab 

Invalid spaces before ncols and nrows
KB112_4746_19680101.ASC
 ncols    500
 nrows    625