Figure 2. Cross-section through a hypothetical barrier island underlain by extremely thick sand beds. The lower dotted line shows the relative position of the freshwater-saltwater interface. The upper dotted line shows the position of the water table as calculated by the equation from Fetter (2001) where
H is hydraulic head (elevation of top of saturated zone)
K is hydraulic permeability of the sediments
W is the rate of recharge
L is half the width of the island
X is the distance from the side of the island, and
G equals 40, based on the ratio of the density of sea water and fresh water.
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May28 10
