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Summary of July 2006 Monthly Hydrologic Conditions

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

July 2006

Precipitation was above normal at all three index stations. Newark reported 6.71 inches, which is 143 percent of normal. Atlantic City reported 5.20 inches, which is 135 percent of normal. Trenton reported 5.23 inches, which is 122 percent of normal. Total precipitation over the past 12 months was: 49.64 inches at Newark, which is 3.39 inches above normal; 43.47 inches at Atlantic City, which is 2.88 inches above normal; and 49.81

Combined storage in the thirteen major water supply reservoirs as of July 31 was 73.2 billion gallons (91.0 percent of capacity), which is greater than the average July contents for the reference period 1961-1990. The storage was 4.55 billion gallons less than one month ago and 10.5 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 above normal at all three index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 141 ft³/s, or 154 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 110 ft³/s, or 168 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 19,770 ft³/s, or 271 percent of normal. Flow on the Delaware River receded steadily throughout July following flooding which occurred on June 29. The observed daily mean discharge of the Delaware River at Trenton on July 31 was 7,470 ft³/s.

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

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 19.2 to 28.7 degrees Celsius. Dissolved oxygen ranged from 6.6 to 10.6 milligrams per liter. Specific conductance ranged from 87 to 231 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