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Summary of July 2005 Monthly Hydrologic Conditions

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

July 2005

Precipitation was below normal at the Newark index station, and above normal at the Trenton and Atlantic City index stations. Newark reported 4.05 inches, which is 86.5 percent of normal. Trenton reported 6.13 inches, which is 143 percent of normal. Atlantic City reported 4.44 inches, which is 115 percent of normal. Total precipitation over the past 12 months was: 42.94 inches at Newark, which is 3.31 inches below normal; 48.43 inches at Trenton, which is 7.04 inches above normal; and 43.10 inches at Atlantic City, which is 2.51 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of July 31 was 62.7 billion gallons (78.0 percent of capacity), which is less than the average July contents for the reference period 1961-1990. The storage was 5.60 billion gallons less than one month ago and 12.3 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 Great Egg Harbor River index station, and below normal at the South Branch Raritan and Delaware River index stations. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 75.9 ft³/s, 116 percent of normal. The monthly-mean discharge at South Branch Raritan River near High Bridge was 52.5 ft³/s, 57.3 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 5,030 ft³/s, 69.1 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on July 31 was 3,500 ft³/s.

Groundwater levels, as measured in water-table observation wells on July 31, were below normal at the Readington School 11 index well, and above normal at the Morrell 1 and Vocational School 2 index wells. From last month, levels increased at Readington well, and decreased at Morrell and Vocational School wells. Levels were lower than one year ago at all three index wells.

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 21.7 to 31.8 degrees celsius. Dissolved oxygen ranged from 5.9 to 11.5 milligrams per liter. Specific conductance ranged from 209 to 278 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