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Summary of February 2006 Monthly Hydrologic Conditions

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

February 2006

Precipitation was below normal at all three index stations. Newark reported 0.79 inches, which is 18.8 percent of normal. Atlantic City reported 0.37 inches, which is 9.1 percent of normal. Trenton reported 1.30 inches, which is 37.6 percent of normal. Total precipitation over the past 12 months was: 41.22 inches at Newark, which is 5.03 inches below normal; 46.90 inches at Atlantic City, which is 5.51 inches above normal; and 41.46 inches at Trenton, which is 0.87 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of March 31 was 74.11 billion gallons (92.2 percent of capacity), which is greater than the average March contents for the reference period 1961-1990. The storage was 4.73 billion gallons less than one month ago and 5.69 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 below normal at all three index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 86.1 ft³/s, 41.6 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 73.6 ft³/s, 59.8 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 7,730 ft³/s, 38.8 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on March 31 was 6,090 ft³/s.

Groundwater levels, as measured in water-table observation wells for the month of March, were below normal at Readington School 11, slightly below normal at Vocational School 2, and approximately normal at Morrell 1. Levels decreased from last month, and were lower than one year ago at all three index wells.

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 2.0 to 13.8 degrees Celsius. Dissolved oxygen ranged from 11.2 to 17.8 milligrams per liter. Specific conductance ranged from 186 to 258 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