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Summary of March 2007 Monthly Hydrologic Conditions

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

March 2007

Precipitation was below normal at the Newark and Atlantic City index stations, and above normal at the Trenton index station. Newark reported 3.93 inches, which is 93.4 percent of normal. Atlantic City reported 3.52 inches, which is 86.7 percent of normal. Trenton reported 4.28 inches, which is 124 percent of normal. Total precipitation over the past 12 months was: 51.05 inches at Newark, which is 4.80 inches above normal; 51.54 inches at Atlantic City, which is 10.95 inches above normal; and 49.87 inches at Trenton, which is 8.48 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of March 31 was 76.8 billion gallons (95.5 percent of capacity), which is greater than the average March contents for the reference period 1961-1990. The storage was 3.33 billion gallons more than one month ago and 2.66 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 near normal at the South Branch Raritan River and Great Egg Harbor River index stations, and above normal at the Delaware River index station. The monthly-mean discharge at South Branch Raritan River near High Bridge was 202 ft³/s, or 97.6 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 128 ft³/s, or 104 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 24,040 ft³/s, or 121 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on March 31 was 35,000 ft³/s.

Groundwater levels, as measured in water-table observation wells for the month of March, were above normal at all three index wells. Levels increased from last month at the Readington School 11 and Vocational School 2 wells, and decreased from last month at the Morrell 1 well. Levels were higher compared to last year 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 0.2 to 7.7 degrees Celsius. Dissolved oxygen ranged from 9.1 to 16.9 milligrams per liter. Specific conductance ranged from 99 to 244 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