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Summary of May 2006 Monthly Hydrologic Conditions

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

May 2006

Precipitation was below normal at the Newark and Trenton index stations, and above normal at the Atlantic City index station. Newark reported 3.35 inches, which is 75.1 percent of normal. Trenton reported 2.47 inches, which is 65.9 percent of normal. Atlantic City reported 3.58 inches, which is 106 percent of normal. Total precipitation over the past 12 months was: 43.98 inches at Newark, which is 2.27 inches below normal; 47.02 inches at Trenton, which is 5.63 inches above normal; and 41.56 inches at Atlantic City, which is 0.97 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of May 31 was 76.31 billion gallons (94.9 percent of capacity), which is greater than the average May contents for the reference period 1961-1990. The storage was 0.04 billion gallons less than one month ago and 0.99 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 below normal at all three index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 112 ft³/s, 65.5 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 62.5 ft³/s, 61.3 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 11,270 ft³/s, 73.1 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on May 31 was 7,690 ft³/s.

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

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 13.8 to 25.6 degrees Celsius. Dissolved oxygen ranged from 7.6 to 11.4 milligrams per liter. Specific conductance ranged from 140 to 204 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