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Summary of December 2004 Monthly Hydrologic Conditions

Compiled in cooperation with the New Jersey Department of Environmental Protection
Provisional assessment of hydrologic conditions in New Jersey

The following pages are adapted for online release from a summary of hydrologic condions for the previous month.

December 2004

Precipitation was below normal at the Newark and Atlantic City index stations, and above normal at the Trenton index station. Newark reported 3.37 inches, which is 94.4 percent of normal. Atlantic City reported 2.55 inches, which is 80.1 percent of normal. Trenton reported 3.69 inches, which is 109 percent of normal. Precipitation totals for the 2004 calendar year were 104 percent of normal at Newark, 96 percent of normal at Atlantic City, and 113 percent of normal at Trenton.

Combined storage in the thirteen major water supply reservoirs as of December 31 was 78.7 billion gallons, which is 97.9 percent of capacity. The storage was 2.48 billion gallons more than one month ago and 0.19 billion gallons less than one year ago. The thirteen major water supply reservoirs are as follows: Lake Tappan, Woodcliff Lake, Oradell Reservoir, DeForest Lake, Splitrock Reservoir, Boonton Reservoir, Canistear Reservoir, Oak Ridge Reservoir, Clinton Reservoir, Charlottesburg Reservoir, Echo Lake, Wanaque Reservoir and Spruce Run Reservoir.

Streamflow was above normal at all three index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 197 ft³/s, 127 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 109 ft³/s, 110 percent of normal. The observed monthly mean discharge of the Delaware River at Trenton was 27,590 ft³/s, 193 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on December 31 was 16,800 ft³/s. Mean annual streamflows for the 2004 calendar year were 90.6 percent of normal at South Branch Raritan at High Bridge, 110 percent of normal at Great Egg Harbor River at Folsom, and 129 percent of normal at Delaware River at Trenton.

Groundwater levels, as measured in water-table observation wells, were above normal at all three index wells. Levels decreased from last month, and were lower than one year ago.

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 0.3 to 7.8 degrees celsius. Dissolved oxygen ranged from 12.4 to 15.7 milligrams per liter. Specific conductance ranged from 87 to 205 microsiemens per centimeter at 25°C.

All of the files listed below are in Portable Document Format (PDF) which can be viewed/printed with the Adobe Acrobat® Reader, freely available for most computer platforms.

• Combined Storage in the 13 Major Water Supply Reservoirs
• Monthly precipitation at three selected sites
• Groundwater levels in selected Water-table observation wells
• Streamflow at selected sites
• Water quality for the Delaware River at Trenton