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SUMMARY ARCHIVES

Summary of September 2010 Monthly Hydrologic Conditions

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

September 2010

Map of New Jersey showing sites where hydrologic conditions are reported.

The New Jersey Department of Environmental Protection issued a statewide drought watch on September 8, 2010, “[as] a result of record high temperatures and water demands, combined with near-record low precipitation”.
(http://www.nj.gov/dep/newsrel/2010/10_0088.htm)

For the month of September, precipitation was below normal at the Trenton and Newark index stations, but above normal at the Atlantic City index station. Newark reported 3.58 inches, which is 89.3 percent of normal. Atlantic City reported 3.46 inches, which is 110 percent of normal. Trenton reported 3.05 inches, which is 89.2 percent of normal. Total precipitation over the past 12 months was: 47.69 inches at Newark, which is 1.44 inches above normal; 53.07 inches at Atlantic City, which is 12.48 inches above normal; and 41.28 inches at Trenton, which is -0.11 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of September 30 was 44.883 billion gallons (55.5 percent of capacity), which is less than the average September contents for the reference period 1961-1990. The storage was 8.106 billion gallons less than one month ago and 25.001 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 the long-term monthly-mean for the reference period 1971-2000 at all three index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 32.0 ft3/s, 38.8 percent of the long-term mean. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 32.2 ft3/s, 57.3 percent of the long-term mean. The monthly mean discharge of the Delaware River at Trenton was 2,922 ft3/s, 45.5 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on September 30 was 3,370 ft3/s.

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

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 19.0 to 28.1 degrees Celsius. Dissolved oxygen ranged from 6.8 to 11.0 milligrams per liter. Specific conductance ranged from 219 to 254 microsiemens per centimeter at 25°C.

Note: The preceding data is preliminary and subject to revision.

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.

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