The lagoon is 0.3 km in lenght, has a maximum depth of 0.3 m and a tidal range about 0.2m. Seawater enters the lagoon on most high tides, but the freshwater input from a stream at western end of Skaith is high enough to keep the salinity as low 2 ‰ at low tide.
The salinity range was estimated to be between 2‰ eand 18‰.
There is a very little effect from wave action and tidal currents affect only the small area around the entrance channel.
The lagoon, between 0 and 0.3 m depth,was a mixture of sand and gravel, covered by a thin layer of fine sand.
The sediment was dominated by the green alga Enteromorpha intestinalis.Occasional clumps of the brackish-water wrak Fucus ceranoides were present and colonised by epiphytic growths of ectocarpoid brown algae. The sediment had very sparse infauna and only the burrowing amphipod Corophium volutator was recorded.
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