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Summary of March 2006 Monthly Hydrologic Conditions

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

March 2006

Precipitation was at or slightly above normal at the three index stations. Newark reported 4.05 inches, which is 103 percent of normal. Atlantic City reported 3.45 inches, which is 100 percent of normal. Trenton reported 3.70 inches, which is 103 percent of normal. Total precipitation over the past 12 months was: 41.84 inches at Newark, which is 4.41 inches below normal; 41.51 inches at Atlantic City, which is 0.92 inches above normal; and 45.90 inches at Trenton, which is 4.51 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of April 30 was 76.4 billion gallons (95.0 percent of capacity), which is greater than the average April contents for the reference period 1961-1990. The storage was 2.24 billion gallons more than one month ago and 2.64 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 105 ft³/s, or 50.0 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 81.4 ft³/s, or 67.3 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 10,650 ft³/s, or 49.3 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on April 30 was 15,600 ft³/s.

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

Specific conductance reached a new period of record monthly maximum at the Delaware River at Trenton in April. Other water quality parameters collected at the site were within recorded historical monthly extremes. Water temperature ranged from 9.2 to 19.2 degrees Celsius. Dissolved oxygen ranged from 7.6 to 14.3 milligrams per liter. Specific conductance ranged from 121 to 264 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