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A layer or layers of graded fine stones underlying a breakwater, GROYNE or rock EMBANKMENT to prevent the natural bed material from being washed away.
Source http://www.kennisbank-waterbouw.nl/Glossary/printUK.php?subject=@Зураг
A layer or layers of graded fine stones underlying a breakwater, GROYNE or rock EMBANKMENT to prevent the natural bed material from being washed away.
Source http://www.kennisbank-waterbouw.nl/Glossary/printUK.php?subject=@