Algera bridge over Hollandse IJssel - delta works storm surge barrier

algera bridge hollandse ijssel delta works storm surge barrier algerabrug stormvloedkering flood defences algerasluis flood protection algerakering barrier infrastructure netherlands iconic south holland capelle aan den ijssel krimpen aan den ijssel aerial drone cityscape architecture europe birdseye view city urban travel transport construction european day landmark visit explore destination impressive attraction point of interest drone flight aerial view building no people nobody traffic over bridge hollandse ijsselkering rijkswaterstaat