where:

σφb = standard deviation or measure of sorting for borrow material (Equation III-1-3)

σφn = standard deviation or measure of sorting for native material (Equation III-1-3)

Mφn = mean sediment diameter for native material (Equation III-1-2)

Mφb = mean sediment diameter for borrow material (Equation III-1-2)

Values obtained using the relationships in Equations V-4-3 and V-4-4 are then plotted on the graph

presented in Figure V-4-9. The value of *R*A can be obtained by interpolating between the values

represented by the isolines. Values of the overfill factor greater than 1.0 indicate that more than one

unit of borrow material will be needed to produce one unit of fill material. Example V-4-1 illustrates

computation of the overfill factor.

V-4-26

Beach Fill Design

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