| 31. | The Watergraafsmeer part of the borough is a polder.
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| 32. | Polders and dams enclose most of the wetland area.
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| 33. | Polders in Britain are mostly drained by gravity, rather than active pumping.
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| 34. | The supervisor of the project, Jaap Kreeft gave the polder its name.
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| 35. | In the Watergraafsmeer polder, five people were killed.
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| 36. | "Tochmaland " was built in to drain the Tochmaland polder.
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| 37. | The Archimedes'screw that pumped water into the polder has been removed.
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| 38. | The water management of the polder will be independent.
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| 39. | The polders between each of these posts were flooded.
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| 40. | This resulted in the creation of the Bamburg polder.
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