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Summary of August 2007 Monthly Hydrologic Conditions

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

August 2007

Precipitation was above normal at the Newark index station, and below normal at the Atlantic City and Trenton index stations. Newark reported 7.32 inches, which is 182 percent of normal. Atlantic City reported 3.51 inches, which is 81.2 percent of normal. Trenton reported 2.73 inches, which is 71.8 percent of normal. Total precipitation over the past 12 months was: 61.12 inches at Newark, which is 14.87 inches above normal; 47.90 inches at Atlantic City, which is 7.31 inches above normal; and 50.53 inches at Trenton, which is 9.14 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of August 31 was 58.0 billion gallons (72.1 percent of capacity), which is slightly less than the average August contents for the reference period 1961-1990. The storage was 5.71 billion gallons less than one month ago and 8.09 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 above normal at the South Branch Raritan River and Delaware River index stations, and below normal at the Great Egg Harbor River index station. The monthly-mean discharge at South Branch Raritan River near High Bridge was 111 ft³/s, 147 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 42.6 ft³/s, 72.4 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 6,350 ft³/s, 115 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on August 31 was 4,780 ft³/s.

Groundwater levels, as measured in water-table observation wells for the month of August, were above normal at all three index wells. Levels increased from last month at the Readington School 11 well, and decreased from last month at the Morrell 1 and Vocational School 2 wells. Compared to one year ago, levels are lower at the Readington School 11 and Vocational School 2 wells, and are higher 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 30.7 degrees Celsius. Dissolved oxygen ranged from 6.0 to 10.9 milligrams per liter. Specific conductance ranged from 175 to 237 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