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Summary of October 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.

October 2004

Precipitation was below normal at the Newark and Trenton index stations, and above normal at the Atlantic City index station. Newark reported 0.89 inches, which is 28.2 percent of normal. Trenton reported 1.49 inches, which is 56.9 percent of normal. Atlantic City reported 3.49 inches, which is 122 percent of normal.

Combined storage in the thirteen major water supply reservoirs as of October 31 was 74.3 billion gallons, which is 92.4 percent of capacity. The storage was 2.42 billion gallons less than one month ago and 2.15 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 South Branch Raritan River near High Bridge index station, and above normal at the Great Egg Harbor River at Folsom and Delaware River at Trenton index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 80.3 ft³/s, 89.9 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 81.5 ft³/s, 130 percent of normal. The observed monthly mean discharge of the Delaware River at Trenton was 15,000 ft³/s, 184 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on October 31 9,870 ft³/s.

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

Water quality parameters collected at the Delaware River at Trenton were within recorded historic monthly extremes.

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