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The potential for water-supply development of the aquifers along the ocean beach between Ocean City, Md., and Behoboth Beach, Del., is good. The ocean beach, the easternmost segment of the Coastal Plain province, is underlain by unconsolidated sand, gravel, silt, clay, shale, and shell beds which overlie deeply buried southeastward-sloping consolidated rocks. At Rehoboth Beach the estimated thickness of the sediments is about 6,500 feet, and at Ocean City about 8,500 feet The sediments are of Triassic, Cretaceous, Tertiary, and Quaternary age. Only sands and gravels in the uppermost 300 feet of the sediments are used at present (1959) as a source of ground water. At Ocean City the major aquifers are formations of the Pleistocene, Pliocene (?), and upper part of the Miocene Series. The Pocomoke and Manokin aquifers in the Miocene Series are the most productive. Some wells ending in the Manokin aquifer are capable of sustained yields of 500 gpm. At Rehoboth Beach large amounts of ground water are obtained from wells ending in sand and gravel of the Pleistocene Series. Some of these wells yield as much as 700 gpm. Only water for domestic use is obtained from the deeper Pocomoke and Manokin aquifers. Along the ocean front in Maryland, iron is common in the ground water in concentrations sufficient to be objectionable. In the Fenwick Island area, saline or brackish water is present locally. Generally, in Delaware the sands of the Pleistocene Series yield water of good quality. However, at Rehoboth Beach public-supply wells had to be relocated inland because of salt-water infiltration into the aquifers. In the deeper aquifers salt water may be expected below depths of 700 to 900 feet.

Beach-area water supplies between Ocean City, Maryland and Rehoboth Beach, Delaware