3x Multi F-dek (open and closed) for B-E De Lier albers2018-07-18T10:02:49+00:0030 May 2016| Albers Alligator has installed three Multi-F covers for B-E De Lier at Greenco in Middenmeer. 5,760 m² of the rainwater basin is open. The two drain basins measuring 1,160 m² each are entirely closed. To complete project overview