New Jersey Water Science Center
Summary of October 2011 Monthly Hydrologic Conditions
Compiled in cooperation with the New Jersey Department of Environmental Protection
Precipitation was above normal at the Newark index station for the reference period 1981-2010, and below normal at the Atlantic City and Trenton index stations. Newark reported 5.80 inches, which is 161 percent of normal. Atlantic City reported 3.00 inches, which is 88 percent of normal. Trenton reported 3.03 inches, which is 72 percent of normal. Total precipitation over the past 12 months was: 67.58 inches at Newark, which is 21.33 inches above normal; 46.15 inches at Atlantic City, which is 4.40 inches above normal; and 57.29 inches at Trenton, which is 10.85 inches above normal.
Combined storage in the thirteen major water supply reservoirs as of October 31 was 78.597 billion gallons (97.2 percent of capacity), which is higher than the average October contents for the reference period 1961-1990. The storage was -1.649 billion gallons less than one month ago and 24.615 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, Charlotteburg Reservoir, Echo Lake, Wanaque Reservoir and Spruce Run Reservoir.
Streamflow was above the long-term monthly-mean for the reference period 1981-2010 at all three index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 225 ft3/s, 257 percent of the long-term mean. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 101 ft3/s, 169 percent of the long-term mean. The monthly mean discharge of the Delaware River at Trenton was 25,680 ft3/s, 303 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on October 31 was 20,000 ft3/s.
Groundwater levels, as measured in water-table observation wells for the month of October were above normal at all three index wells. Levels decreased from last month at the Readington School 11 and Vocational School 2 wells, and increased from last month at the Morrell 1 well. Levels were higher than one year ago at all three wells.
Water-quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 7.1 to 17.4 degrees Celsius. Dissolved oxygen ranged from 9.0 to 12.8 milligrams per liter. Specific conductance ranged from 94 to 194 microsiemens per centimeter at 25°C.
Note: The preceding data is preliminary and subject to revision.
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