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The total area of permanent standing water is 5.5 ha, though the area is subject to periodic flooding, when standing water can temporarily cover the entire site and fresh sediment is deposited. Part of Marston Lake, the largest of the three permanent lakes, is fringed with tall fen vegetation, characterised by Bulrush, "Typha latifolia", Meadowsweet, "Filipendula ulmaria", and Common Marsh-bedstraw, "Galium palustre".