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Coarse to Fines - "Rule of Thumb"

Sediment containing 80% sands and 20% fines (i.e 80/20) has typically been considered to contain the maximum amount of fine-grained materials suitable for use in a beach nourishment project. Use of source materials containing a higher percentage of fines has typically been discouraged unless a high degree of background information on sediment movement pattersn and ecological habitats in the vicinity of the project is available. The 80/20 ratio is a "rule of thumb" as opposed to an actual regulation, and we have identified and provided known information on this rule of thumb in the links below.