| 11. | Most of the Biesbosch was reclaimed and turned into polders.
|
| 12. | The sky above the polders began to play a more important role.
|
| 13. | It was dammed and used for draining the surrounding polders.
|
| 14. | It was built to drain the Hartwerd-West polder.
|
| 15. | N85 Purmerend-Almere ( planned route into the discontinued Markerwaard polder)
|
| 16. | You have to keep water out of the polder.
|
| 17. | A polder is farmland reclaimed over the centuries from marsh and river basins.
|
| 18. | The most critical zone is the Culemborgerwaard en Tielerwaard polder in western Netherlands.
|
| 19. | The windmills were later used to drain lakes, creating the famous polders.
|
| 20. | The first polders were constructed in the 11th century.
|
