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Summary of November 2009 Monthly Hydrologic Conditions

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

November 2009

Precipitation was below normal at all three index stations. Newark reported 1.20 inches, which is 30.9 percent of normal.  Atlantic City reported 1.38 inches, which is 41.6 percent of normal.  Trenton reported 3.12 inches, which is 95.7 percent of normal. Total precipitation over the past 12 months was: 46.68 inches at Newark, which is 0.43 inches above normal; 52.78 inches at Atlantic City, which is 11.39 inches above normal; and 58.83 inches at Trenton, which is 18.24 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of November 30 was 66.323 billion gallons (82.0 percent of capacity), which is higher than the average November contents for the reference period 1961-1990.  The storage was -2.755 billion gallons lower than one month ago and 3.816 billion gallons higher 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 the Great Egg Harbor River at Folsom and Delaware River at Trenton index stations, and below normal at the South Baranch Raritan River near High Bridge index station. The monthly-mean discharge at South Branch Raritan River near High Bridge was 74.2 ft3/s, 60.8 percent of normal.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 100 ft3/s, 130 percent of normal.  The monthly mean discharge of the Delaware River at Trenton was 11,250 ft3/s, 102 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on November 30 was 7980 ft3/s.

Ground-water levels, as measured in water-table observation wells for the month of November were above normal at all three index wells. Levels decreased from last month at the Readington School 11 and Morrell 1 index wells while they increased at the Vocational School 2 index well. Levels were higher than one year ago at the Readington School 11 and Vocational School 2 index wells, but were lower than one year ago at the Morrell 1 index well.

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 7.6 to 12.8 degrees Celsius. Dissolved oxygen ranged from 10.1 to 12.7 milligrams per liter. Specific conductance ranged from 125 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