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Summary of February 2005 Monthly Hydrologic Conditions

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

February 2005

Precipitation was below normal at the Newark and Trenton index stations, and above normal at the Atlantic City index station. Newark reported 2.81 inches, which is 94.9 percent of normal. Trenton reported 2.59 inches, which is 92.8 percent of normal. Atlantic City reported 3.23 inches, which is 113 percent of normal. Total precipitation over the past 12 months was 50.76 inches at Newark which is 4.51 inches above normal, 48.89 inches at Trenton which is 7.50 inches above normal, and 42.64 inches at Atlantic City which is 2.05 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of February 28 was 78.8 billion gallons, which is 97.6 percent of capacity. The storage was 0.22 billion gallons more than one month ago and 3.07 billion gallons more 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 slightly below normal at the High Bridge and Folsom index stations, and above normal at the Trenton index station. The monthly-mean discharge at South Branch Raritan River near High Bridge was 164 ft³/s, 96.5 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 106 ft³/s, 99.1 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 14,710 ft³/s, 105 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on February 28 was 11,600 ft³/s.

Groundwater levels, as measured in water-table observation wells, were above normal at all three index wells. Levels increased from last month at all three index wells, were higher than one year ago at Readington School 11 and Morrell 1, and lower than one year ago at Vocational School 2.

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 0.3 to 4.3 degrees celsius. Dissolved oxygen ranged from 13.1 to 15.5 milligrams per liter. Specific conductance ranged from 159 to 224 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