SUMMARY OF HYDROLOGIC CONDITIONS
FOR THE
UPPER DELAWARE RIVER BASIN
JANUARY 2000


Prepared by the 
Office of the Delaware River Master
Milford, Pennsylvania

Adjusted streamflow in the upper Delaware River basin during January was within the normal range. The maximum daily discharge of 6,450 cfs occurred on January 12. The minimum daily discharge was 2,620 cfs on January 9. Streamflow was affected by ice during January 15-31.

On the basis of a 5-station average, precipitation during January was 3.22 inches, which was 107 percent of the 59-year average. The maximum daily-average precipitation during January was 0.80 inches on January 31. Precipitation in the upper Delaware River Basin during the past 12 months was 4.28 inches less than the long-term average. Precipitation during January was 0.20 inches more than the long-term average for the month. 

The monthly mean streamflow of the Delaware River at Montague, N.J. during January was 3,540 cfs (observed), which was 71 percent of the median. The flow at Montague, adjusted for diversions from the basin and change in storage in the major reservoirs was 4,488 cfs, or 102 percent of median (water years 1961-90).

Storage February 1, 2000, in Pepacton, Cannonsville and Neversink Reservoirs was 69.2 percent of capacity above the point of maximum depletion. The combined storage of 187 billion gallons was 2 billion gallons greater than that of one month ago and was 24 billion gallons more than that of one year ago. Median storage on the first day of February in 32 years of record is 214 billion gallons.

As part of a statewide network, the USGS operates 14 observation wells in the Pennsylvania part of the Delaware River Basin. Mean water levels during January were below average in 6 of the wells. Water levels in most observation wells were trending downward in comparison to December levels.

 

HYDROLOGIC CONDITIONS IN THE UPPER DELAWARE RIVER BASIN
Compiled by the Office of the Delaware River Master, Milford, Pa.
(Preliminary data - subject to revision)
PRECIPITATION, IN INCHES

 

Dec. 1940 to Dec. 1998

February 1999 to January 2000

 

Average

Actual

Percent of average

Excess (+) or deficit (-)

 

Amount

Cumulative

Amount

Cumulative

By month

Cumulative

By month

Cumulative

Feb.

2.66 43.26 1.67 38.98 63 90 -.99 -4.28

Mar.

3.30 40.60 4.40 37.31 133 92 +1.10 -3.29

Apr.

3.78 37.30 2.29 32.91 61 88 -1.49 -4.39

May

4.19 33.52 3.32 30.62 79 91 -.87 -2.90

June

3.94 29.33 2.28 27.30 58 93 -1.66 -2.03

July

4.12 25.39 2.34 25.02 57 99 -1.78 -.37

Aug.

3.87 21.27 3.05 22.68 79 107 -.82 +1.41

Sept.

3.74 17.40 9.08 19.63 243 113 +5.34 +2.23

Oct.

3.40 13.66 2.72 10.55 80 77 -.68 -3.11

Nov.

3.87 10.26 2.98 7.83 77 76 -.89 -2.43

Dec.

3.37 6.39 1.63 4.85 48 76 -1.74 -1.54

Jan.

3.02 3.02 3.22 3.22 107 107 +.20 +.20

 Note: Amount shown in cumulative columns is total from month shown to present.

 

STREAMFLOW, IN CFS

DELAWARE RIVER AT MONTAGUE, N.J.

Month

1940-98

 

Percent of

Maximum

Median

Minimum

Monthly mean

median

January (observed)

15,600 (1996) 4,960 1,318 (1981) 3,540 71

 January (adjusted)

21,330 (1996) 5,874 1,064 (1981) 4,488 76

 

         

February (observed)

15,120 (1976) 5,456 1,748 (1980)    

 February (adjusted)

20,330 (1981) 5,610 1,373 (1980)