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Summary of November 2007 Monthly Hydrologic Conditions

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

November 2007

Precipitation was below normal at all three index stations. Newark reported 2.35 inches, which is 61 percent of normal. Atlantic City reported 1.40 inches, which is 43 percent of normal. Trenton reported 1.61 inches, which is 48 percent of normal. Total precipitation over the past 12 months was: 51.90 inches at Newark, which is 5.65 inches above normal; 36.38 inches at Atlantic City, which is 4.21 inches below normal; and 40.54 inches at Trenton, which is 0.85 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of November 30 was 51.2 billion gallons (63.7 percent of capacity), which is less than the average November contents for the reference period 1961-1990. The storage was 2.34 billion gallons more than one month ago and 28.4 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 the South Branch Raritan River near High Bridge and at the Great Egg Harbor River at Folsom index gages, and above normal at the Delaware River at Trenton index gage. The monthly-mean discharge at South Branch Raritan River near High Bridge was 106 ft³/s, 87 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 45.3 ft³/s, 59 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 13500 ft³/s, 122 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on November 30 was 22000 ft³/s.

Groundwater levels, as measured in water-table observation wells for the month of November, were above normal at Readington School 11 index well, and below normal at Morrell 1 and Vocational School 2 index wells. Levels at Readington School 1 and Morrell 11 index wells increased and the Vocational School 2 index well decreased from last month, and all 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 5.3 to 11.7 degrees Celsius. Dissolved oxygen ranged from 11 to 13 milligrams per liter. Specific conductance ranged from 108 to 244 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