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DGS Annual Report

DGS Annual Report of Programs and Activities.

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B6 The Water Resources of Northern Delaware

B6 The Water Resources of Northern Delaware

Northern Delaware, the area above the Chesapeake and Delaware Canal in New Castle County, is an area of rapidly growing population and expanding industry. In some places the demand for water has reached or exceeded the capacity of the existing facilities creating apparent water shortages. Many agencies, both public and private, are attempting to alleviate these shortages; studies are being made and reports prepared for immediate action as well as long-term planning. It is the purpose of this report to examine on a long-range basis the water resources of the northern Delaware area. This examination indicates that the surface-water and groundwater resources of the area far exceed the 72.8mgd (million gallons per day) used during 1955. The amount of ground water potentially available in the area is estimated to be at least 30 mgd and the amount of surface water potentially available depends principally on the amount of storage that may be feasible economically. Storage of 3 million gallons per square mile would provide an allowable draft rate of 140 mgd with a deficiency at average intervals of ten years, while storage of 30 million gallons per square mile would raise the allowable draft to 250 mgd, which is about half of the mean annual discharge. In addition to the fresh-water resources, saline water from the Delaware River and its tidal estuaries is available in almost unlimited quantity for cooling, fire fighting, some types of washing, and other purposes.

RI28 Well and Aquifer Tests, Laird Tract Well Field, Newark, Delaware

RI28 Well and Aquifer Tests, Laird Tract Well Field, Newark, Delaware

Well and aquifer coefficients have been determined for a crystalline rock aquifer system that provides part of the water supply of the City of Newark, Delaware. Conventional analytical methods can be used to derive coefficients for crystalline rocks in the Newark area if the limitations of such methods are recognized and if the local hydrologic framework is known.

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RI27 Ground-Water Investigations in the Delaware Piedmont for the City of Newark, 1976

RI27 Ground-Water Investigations in the Delaware Piedmont for the City of Newark, 1976

Field reconnaissance, geologic mapping, and photogeologic interpretations aided collectively in the identification of 30 potential high-yield well sites in the crystalline rocks of Delaware's western Piedmont. Fracture traces discernable on panchromatic and color infrared photography were identified in the study area. Well locations were selected on individual traces and on fracture trace intersections. Six test wells averaging 468.5 feet in depth were drilled at selected sites. Test analyses indicate that production wells at these sites would have a combined potential estimated at 1.0 to 1.1 million gallons per day of water. A thorough knowledge of the hydrogeologic framework is key to successful ground-water exploration and development. Subsurface fracturing is of prime importance in governing the water-yielding properties in the crystalline rocks. The surface traces of vertical or near-vertical zones of subsurface rock fracture were identified and used as an aid in high-capacity well siting.

RI24 Relation of Ground Water to Surface Water in Four Small Basins of the Delaware Coastal Plain

RI24 Relation of Ground Water to Surface Water in Four Small Basins of the Delaware Coastal Plain

Beaverdam Branch, the Nanticoke River, Sowbridge Branch, and Stockley Branch drain small basins in the Delaware Coastal Plain that are characterized by similar climate, topography, geology, and land use. Withdrawals of ground water and surface water are very small, there is little urbanization, and other man-made effects, which include minor regulation on Sowbridge Branch and construction of drainage ditches in the Nanticoke basin, probably have had minimal effect on the natural hydrologic regimen. These are virtually natural-flow streams, which, because of similar basin characteristics, have nearly identical rates of evapotranspiration and runoff. During the 10-year period, 1959-68, precipitation averaged 40-42 inches annually, runoff averaged 16-17 inches annually, and evapotranspiration averaged 23-25 inches annually.

Introduction to the Hydrogeology of Delaware

Brandywine Creek

Delaware’s water, both ground and surface, is one of its most important natural resources. As Delaware’s lead earth science agency, the Delaware Geological Survey provides information to inform and educate resource managers and the public to better understand and manage our water resources.

The Geology of Delaware

The Geology of Delaware is an online resource for information about the geology and hydrogeology of Delaware. Information on these pages is explained in general terms although common geologic terminology is used. This book covers the major important factors in Delaware geology as well as latest research. Additional information is provided at the bottom of some pages and on the last page of the book, More Information.

Simulation of Groundwater Flow in Southern New Castle County, Delaware

Diagram of Conceptual Groundwater Flow Model
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To understand the effects of projected increased demands on ground water to supply water, a finite-difference, steady-state, nine-layer, groundwater flow model was used to simulate groundwater flow in the Coastal Plain sediments of southern New Castle County, Delaware. Results are published in DGS RI77

Rapid infiltration basin systems -- research introduction

A. Scott Andres, senior scientist with the Delaware Geological Survey, presented "Rapid Infiltration Basin Systems -- Research Introduction" to the Delaware Clean Water Advisory Council on June 24 in Dover, Del.

About the Delaware Geological Survey

The DGS Building, University of Delaware, Newark Campus

The Delaware Geological Survey (DGS) is a science-based, public-service-driven Delaware state agency at the University of Delaware (UD) that conducts geologic and hydrologic research, service, and exploration for the benefit of the citizens of the First State. The mission of the DGS is to provide objective earth science information, advice, and service to its stakeholders, the citizens, policy makers, industries, and educational institutions of Delaware.

HM12 Ground-Water Recharge Potential Sussex County, Delaware

HM12 Ground-Water Recharge Potential Sussex County, Delaware

The ground-water recharge potential map of Sussex County, Delaware, is a compilation of 1:24,000-scale maps of the water-transmitting properties of sediments in the interval between land surface and 20 ft below land surface. Water-transmitting properties are a key factor in determining the amount of water that recharges Delaware’s aquifers and the susceptibility of aquifers used as sources of water supply to contamination from near-surface pollutant sources. The mapping methodology was developed by Andres (1991) for the geologic characteristics of the Atlantic Coastal Plain portion of Delaware. Mapping and methods development started in 1990 and the final maps were completed in 2002 (Andres et al., 2002). Additional information about the map and methodology and a list of cited references are presented on the reverse side. The mapping program was funded by the Delaware Department of Natural Resources and Environmental Control and the Delaware Geological Survey.

HM11 Ground-Water Recharge Potential Kent County, Delaware

Ground-Water Recharge Potential Kent County, Delaware

The ground-water recharge potential map of Kent County, Delaware, is a compilation of 1:24,000-scale maps of the water-transmitting properties of sediments in the interval between land surface and 20 ft below land surface. Water-transmitting properties are a key factor in determining the amount of water that recharges Delaware’s aquifers and the susceptibility of aquifers used as sources of water supply to contamination from near-surface pollutant sources. The mapping methodology was developed by Andres (1991) for the geologic characteristics of the Atlantic Coastal Plain portion of Delaware. Mapping and methods development started in 1990 and the final maps were completed in 2002 (Andres et al., 2002). Additional information about the map and methodology and a list of cited references are presented on the reverse side. The mapping program was funded by the Delaware Department of Natural Resources and Environmental Control and the Delaware Geological Survey.

HM3 Geohydrology of the Wilmington Area, Delaware

Geohydrology of the Wilmington Area, Delaware

Geology and hydrology of the Wilmington, Delaware area. There are 4 sheets in this series.

HM2 Geohydrology of the Newark Area, Delaware

Geohydrology of the Newark Area, Delaware

Geology and Hydrology of the Newark, Delaware area. There are 2 sheets in this series.