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DGS Annual Report

DGS Annual Report of Programs and Activities.

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Site content related to keyword: "Brandywine Creek"

Stream Station: Brandywine Creek at Wilmington

USGS 01481500 BRANDYWINE CREEK AT WILMINGTON, DE

Station Type: 
Stream
Period of Record: 
1946 to Present
Frequency: 
Monthly
Map County: 
New Castle County
Map Location: 
39.769416667,-75.573277

RI59 Bedrock Geology of the Piedmont of Delaware and Adjacent Pennsylvania

RI59 Bedrock Geology of the Piedmont of Delaware and Adjacent Pennsylvania

This report accompanies a new map that revises the original bedrock geologic maps of the Delaware Piedmont compiled by Woodruff and Thompson and published by the Delaware Geological Survey (DGS) in 1972 and 1975. Combined detailed mapping, petrography, geochemistry, and U-Pb geochronology have allowed us to redefine two rock units and formally recognize eleven new units. A section of the Pennsylvania Piedmont is included on the new map to show the entire extent of the Mill Creek Nappe and the Arden Plutonic Supersuite.

RI34 Long-Term Chemical-Quality Changes in Selected Delaware Streams

RI34 Long-Term Chemical-Quality Changes in Selected Delaware Streams

Data from three streamflow water-quality stations were statistically analyzed to determine the relationships of the major inorganic chemical constituents to specific conductance and to stream discharge. The results show that ion concentrations varied directly with the flow and with specific conductance. A set of regression equations defining these relationships were derived for each of the three stations: Brandywine Creek at Wilmington, St. Jones River at Dover, and Nanticoke River near Bridgeville.