U.S. GEOLOGICAL SURVEY

WATER-RESOURCES CONDITIONS IN

NEW YORK

APRIL 2002




U.S. GEOLOGICAL SURVEY, WRD New York District, Troy, NY WATER RESOURCES REVIEW AND CURRENT CONDITIONS STATEMENT FOR APRIL 2002 Prepared May 1, 2002 Troy Subdistrict--Summary Report Provisional streamflow conditions at sites monitored and included in this report in eastern New York were in the normal to deficient range. Sites monitored in the southeastern region were those in the deficient range. A new provisional period-of-record minimum daily discharge (affected by regulation) for April was recorded at Mohawk River at Cohoes (359 cfs on April 25 - previous = 829 cfs in 1995). Conditions at Wallkill River at Gardiner and Wappinger Creek near Wappingers Falls improved slightly from last month, but were in the deficient range for the ninth consecutive month at Gardiner and the seventh consecutive month at Wappingers Falls. Also, conditions were in the deficient range for the second consecutive month at Schoharie Creek at Prattsville, East Branch Delaware River at Margaretville, and West Branch Delaware River at Walton. The total New York City reservoir system was at 66.9 percent of capacity on April 30; normal for this period is 99.8 percent of capacity. Ithaca Subdistrict--Summary Report Provisional streamflow conditions at sites monitored and included in this report for western New York were in the deficient range at Susquehanna River at Conklin, Unadilla River at Rockdale, and Chenango River at Chenango Forks. Monitored sites at Chemung, Salamanca, Gowanda, Batavia, Wellsville, Garbutt, Ithaca, and Oneida were in the normal range. Coram Subdistrict--Summary Report Mean flow at Connetquot Brook near Central Islip was in the deficient range for the sixth consecutive month. ___________________________________________________________________________________________

___________________________________________________________________________________________ Provisional Data for April 2002 MEAN FLOW FOR SELECTED GAGING STATIONS Period of record Flow Percent Station (to date) (cfs) Exceedence Conditions 01306460 Connetquot Brook nr Central Islip 1978 16 96 Deficient 01318500 Hudson River at Hadley 1921 8,030 56 Normal 01321000 Sacandaga River nr Hope 1911 3,390 54 " 01350000 Schoharie Creek at Prattsville 1902 622 84 Deficient 01357500 Mohawk River at Cohoes 1917 10,800 69 Normal 01371500 Wallkill River at Gardiner 1924 810 88 Deficient 01372500 Wappinger Cr nr Wappingers Falls 1928 165 95 " 01413500 E Br Delaware River at Margaretville 1937 412 82 " 01420500 Beaver Kill at Cooks Falls 1913 751 83 " 01423000 W Br Delaware River at Walton 1950 864 82 " 01502500 Unadilla River at Rockdale 1930-95,2001 1,210 83 " 01503000 Susquehanna River at Conklin 1912 4,960 82 " 01512500 Chenango River nr Chenango Forks 1912 3,510 81 " 01531000 Chemung River at Chemung 1903 3,870 73 Normal 03011020 Allegheny River at Salamanca 1903 5,070 62 " 04213500 Cattaraugus Creek at Gowanda 1940-98,2000 1,400 53 " 04217000 Tonawanda Creek at Batavia 1944 489 43 " 04221000 Genesee River at Wellsville 1916 685 63 " 04230500 Oatka Creek at Garbutt 1945 464 51 " 04234000 Fall Creek at Ithaca 1925 278 74 " 04243500 Oneida Creek at Oneida 1950 332 52 " 04256000 Independence River at Donnattsburg 1942 471 56 " 04262500 W Br Oswegatchie R nr Harrisville 1916 1,530 33 " 04275500 Ausable River at Au Sable Forks 1910-68,1990 2,050 34 " MONTHLY MEAN DISCHARGE FOR SELECTED STREAMFLOW STATIONS

Provisional Data for April 2002 INDEX OBSERVATION WELLS The observation-well network generally reflects conditions in water-table sand and gravel aquifers and does not necessarily reflect conditions in confined and bedrock aquifers. Water levels in N1259, N1616, Q1249, Sa-1100, S1806, and S1810 have been affected by changes in ground-water withdrawals or sewering. Water level in feet below land-surface datum unless site noted with * which indicates reference to sea level. Year record Percent County Well No. began Date Water Level Exceedence Conditions Albany A-636 1974 4/26 11.23 97 Deficient Broome Bm-121 1947 4/29 20.47 27 Normal Broome Bm-128 1980 4/29 24.69 73 " Broome Bm-129 1985 4/29 68.35 66 " Cattaraugus Ct-121 1984 4/15 4.65 92 " Chautauqua Cu-10 1939 4/18 19.21 48 " Chemung Cm-46 1955 4/26 23.69 71 " Chenango Cn-12 1975 4/29 8.82 72 " Clinton Cl-145 1992 4/29 22.60 86 Deficient Cortland C-102 1975 4/30 4.64 45 Normal Dutchess Du-1009 1967 4/29 13.13 55 " Kings *K1194 1971 unavailable Madison M-178 1975 4/29 6.26 49 Normal Nassau *N1259 1962 4/19 41.79 100 Deficient Nassau *N1616 1966 4/19 65.87 100 " Oneida Oe-151 1926 4/29 15.46 28 Normal Otsego Og-23 1953 4/29 5.18 58 " Queens *Q1249 2000 4/26 26.00 - -- Rockland Ro-18 1949 4/29 24.54 99 Deficient St. Lawrence St-40 1953 4/29 5.36 68 Normal Saratoga Sa-1100 1983 4/26 69.08 41 " Steuben Sb-472 1965 4/26 7.08 65 " Suffolk *S1806 1978 4/19 47.92 100 Deficient Suffolk *S1810 1976 4/19 45.86 100 " Suffolk *S1812 1982 4/25 42.92 100 " Suffolk *S4271 1946 4/19 10.97 51 Normal Suffolk *S5517 1948 4/25 40.19 90 Deficient Suffolk *S8833 1951 4/26 15.59 76 " Sullivan Sv-535 2001 4/30 9.59 - -- Wyoming Wo-4 1974 4/26 11.75 69 Normal INDEX OBSERVATION WELLS

LAKES AND RESERVOIRS Elevation & Storage at End of Month Reservoirs (Storage in million cubic feet) Current Year Last Year Average 01314500 Indian Lake nr Indian Lake, NY 4,641 4,655 4,148 01323500 Great Sacandaga Lake at Conklinville 32,350 30,940 31,560 04295000 Richelieu River (Lake Champlain) at Rouses Point, NY - Elevation in ft above sea level April 30, 2002 98.04 April 30, 2001 100.82 Average (1939-2000) 98.41 Maximum daily 101.81 (1993) Minimum daily 94.11 (1965) Provisional Data for April 2002# INDEX STREAMFLOW STATIONS (Reference period 1971-2000)

## Reference period is 1978-2000. *=Deficient e=Estimate # Note: Flow statistics based on data collected through April 30, 2002. NOTES, DEFINITIONS, ETC. Percent exceedence is, for example, the percentage of November monthly mean discharges for period of record equal to or greater than the current November monthly mean discharge. Statistics for the "Index Streamflow Stations" table are for the 30-year reference period 1971-2000. All other statistics used in report are based on the period of record at the site. Median = 50th percentile, which means that, for the period of record included in the analysis, 50% of the values are greater than the median and 50% are less. Deficient range = values below the 25th percentile - for the period of record included in the analysis, 75% of the values are greater and 25% are less than this value. Excessive range = values above the 75th percentile - for the period of record included in the analysis, 25% of the values are greater and 75% are less than this value. Normal range = values between the 25th and 75th percentiles.
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