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Summary of August 2005 Monthly Hydrologic Conditions

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

August 2005

Precipitation was below normal at all three index stations. Newark reported 0.51 inches, which is 12.7 percent of normal. Atlantic City reported 1.02 inches, which is 23.6 percent of normal. Trenton reported 3.58 inches, which is 94.2 percent of normal. Total precipitation over the past 12 months was: 39.77 inches at Newark, which is 6.48 inches below normal; 39.98 inches at Atlantic City, which is 0.61 inches below normal; and 47.67 inches at Trenton, which is 6.28 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of August 31 was 50.9 billion gallons, (63.3 percent of capacity), which is less than the average August contents for the reference period 1961-1990. The storage was 11.8 billion gallons less than one month ago and 21.8 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 below normal at all three index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 27.5 ft³/s, 36.5 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 41.7 ft³/s, 70.9 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 3,450 ft³/s, 62.6 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on August 31 was 3,610 ft³/s.

Groundwater levels, as measured in water-table observation wells for the month of August, were below normal at Readington School 11 and Morrell 1 index wells, and above normal at the Vocational School 2 index well. Levels decreased from last month, and 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 23.8 to 31.6 degrees Celsius. Dissolved oxygen ranged from 4.7 to 10.6 milligrams per liter. Specific conductance ranged from 216 to 272 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