[https://edepot.wur.nl/211289](https://edepot.wur.nl/211289)
“When the muddy deposits have accumulated sufficiently to rise
above the normal summer tides, the salts are consequently washed out of the
upper 20 to 30 cm. of the muddy deposits by the summer rains to such an
extent that the original salt vegetation (Seaweed, Salicornia, etc.) gives way
to a grass flora. These grass-grown deposits are called “kwelders”; they are
covered only by the high tides, especially in winter. When the kwelder is
high enough a dike is built to keep out the sea water; the kwelder is now
transformed into a young sea-polder.”
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