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Summary of June 2010 Monthly Hydrologic Conditions

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

June 2010

Precipitation was below normal for the third month in a row at all three index stations. Newark reported 2.37 inches, which is 70 percent of normal.  Atlantic City reported 1.71 inches, which is 64 percent of normal.  Trenton reported 0.98 inches, which is 26 percent of normal. However, total precipitation over the past 12 months is still above average at all three sites: 52.21 inches at Newark, which is 5.96 inches above normal; 63.19 inches at Atlantic City, which is 22.60 inches above normal; and 53.89 inches at Trenton, which is 12.50 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of June 30 was 68.16 billion gallons (84.3 percent of capacity), which is lower than the average June contents for the reference period 1961-1990.  The storage was -8.05 billion gallons lower than one month ago and 10.22 billion gallons lower 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 62.0 ft3/s, 50 percent of normal.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 68.2 ft3/s, 93 percent of normal.  The monthly mean discharge of the Delaware River at Trenton was 5,530 ft3/s, 53 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on June 30 was 3,780 ft3/s.

Ground-water levels, as measured in water-table observation wells for the month of June, decreased from last month at all three index wells. June levels were below normal and lower compared to last year at the Readington School 11 and Morrell index wells. Levels were above normal and higher compared to last year at the Vocational School 2 index well.

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 19.8 to 29.8 degrees Celsius. Dissolved oxygen ranged from 7.1 to 14.5 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