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Summary of March 2004 Monthly Hydrologic Conditions

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

The following pages are adapted for online release from a summary of hydrologic condions for the previous month.

March 2004

Precipitation was below normal at all three index stations. Newark reported 2.87 inches, which is 68.2 percent of normal. Atlantic City reported 3.45 inches, which is 85.0 percent of normal. Trenton reported 3.05 inches, which is 88.2 percent of normal.

Combined storage in the thirteen major water supply reservoirs as of March 31 was 77.1 billion gallons, which is 95.8 percent of capacity. The storage was 1.37 billion gallons more than one month ago and 3.09 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 147 ft³/s, 71.0 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 118 ft³/s, 95.9 percent of normal. The observed monthly mean discharge of the Delaware River at Trenton was 15,620 ft³/s, 78.4 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on March 31 was 15,900 ft³/s.

The January monthly-mean discharge at Delaware at Trenton was revised from 15,700 ft³/s, 115 percent of normal to 16,050 ft³/s, 118 percent of normal.

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

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