wow, I was really mislead by the original picture. I was looking for a river in a rather wide river bed, so discarded all Belgian airfields, after having a close look on GE just to be sure. I never would have guessed it was Grimbergen (EBGB). And I've flown there, although as a passenger on the Goodyear blimp. It has 2 rather special hangars on the airfield (info in dutch:
Vliegveld Grimbergen Loodsen). Some 20+ years ago it still had the original size with 3 grass runways, but environmentalists forced it to close, later opening again much smaller with one runway. The remainder of the former airfield was turned into a recreational/nature area, where the 2 old runways are still clearly visible. Some more history in dutch
Recreatief Vliegveld Grimbergen - EBGB - Grimbergen Airfield (then click on 'Geschiedenis' button). The Sabena aeroclub is still based there.