PROVISIONAL DATA SUBJECT TO REVISION
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Site Information
LOCATION.--Lat 42°06'17.2", long
74°18'34.4" referenced to North American Datum of
1983, Ulster County, NY, Hydrologic Unit 02020006, on left bank
downstream from bridge on Park Road, in Chichester.
DRAINAGE AREA.--3.83 mi².
PERIOD OF RECORD.--December 2016 to current year.
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 1,020 ft above NAVD of 1988, from topographic map.
REMARKS.--Water Years 2018-23: Records fair except those for estimated discharge, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 916 ft³/s, Dec. 25, 2020, gage height, 7.09 ft, from rating curve extended above 42 ft³/s, on basis of contracted opening measurement of peak flow; minimum discharge 0.03 ft³/s, Oct. 22, 2017; minimum gage height, 2.49 ft, Aug. 17, 19, 26, 2022.
PERIOD OF RECORD1.--November 2016 to current year.
PERIOD OF DAILY RECORD1.--TURBIDITY: DTS12 - November 2016 to current year. Analite - June 2022 to current year.
SUSPENDED-SEDIMENT CONCENTRATION: November 2016 to current year.
SUSPENDED-SEDIMENT DISCHARGE: December 2016 to current year.
INSTRUMENTATION1.--An optical turbidity sensor provides readings at 15-minute intervals since November 2016.
COOPERATION1.--In cooperation with the New York City Department of Environmental Protection.
REMARKS1.--Daily suspended-sediment load and concentration are derived from a regression equation relating turbidity to suspended-sediment concentration.
EXTREMES FOR PERIOD OF DAILY RECORD1.--TURBIDITY: DTS12 - Maximum, 1,600 FNU, June 19, 2017; minimum, <0.2 FNU, Sept. 19, 21, 26, 2021. Analite - Maximum, 1,040 FNU, Aug. 7, 2023; minimum, <0.2FNU, on several days. [<, actual value is known to be less than the value shown]
SUSPENDED-SEDIMENT CONCENTRATION: Maximum daily mean, about 1,360 mg/L, Dec. 25, 2020; minimum daily mean, <1 mg/L, on many days. [<, actual value is known to be less than the value shown]
SUSPENDED-SEDIMENT DISCHARGE: Maximum daily, 46.4 tons, Aug. 17, 2018; minimum daily, <0.01 tons, on many days. [<, actual value is known to be less than the value shown]
1 Water-Quality Records
DRAINAGE AREA.--3.83 mi².
PERIOD OF RECORD.--December 2016 to current year.
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 1,020 ft above NAVD of 1988, from topographic map.
REMARKS.--Water Years 2018-23: Records fair except those for estimated discharge, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 916 ft³/s, Dec. 25, 2020, gage height, 7.09 ft, from rating curve extended above 42 ft³/s, on basis of contracted opening measurement of peak flow; minimum discharge 0.03 ft³/s, Oct. 22, 2017; minimum gage height, 2.49 ft, Aug. 17, 19, 26, 2022.
PERIOD OF RECORD1.--November 2016 to current year.
PERIOD OF DAILY RECORD1.--TURBIDITY: DTS12 - November 2016 to current year. Analite - June 2022 to current year.
SUSPENDED-SEDIMENT CONCENTRATION: November 2016 to current year.
SUSPENDED-SEDIMENT DISCHARGE: December 2016 to current year.
INSTRUMENTATION1.--An optical turbidity sensor provides readings at 15-minute intervals since November 2016.
COOPERATION1.--In cooperation with the New York City Department of Environmental Protection.
REMARKS1.--Daily suspended-sediment load and concentration are derived from a regression equation relating turbidity to suspended-sediment concentration.
EXTREMES FOR PERIOD OF DAILY RECORD1.--TURBIDITY: DTS12 - Maximum, 1,600 FNU, June 19, 2017; minimum, <0.2 FNU, Sept. 19, 21, 26, 2021. Analite - Maximum, 1,040 FNU, Aug. 7, 2023; minimum, <0.2FNU, on several days. [<, actual value is known to be less than the value shown]
SUSPENDED-SEDIMENT CONCENTRATION: Maximum daily mean, about 1,360 mg/L, Dec. 25, 2020; minimum daily mean, <1 mg/L, on many days. [<, actual value is known to be less than the value shown]
SUSPENDED-SEDIMENT DISCHARGE: Maximum daily, 46.4 tons, Aug. 17, 2018; minimum daily, <0.01 tons, on many days. [<, actual value is known to be less than the value shown]
1 Water-Quality Records
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![Graph of Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU), [Observator, Analite NEP 5000 S]](https://natwebcaww01.wr.usgs.gov/nwisweb/data/img/USGS.01362368.333555.63680..20240929.20241006..0..gif)
![Graph of Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU), [Forest Technology Systems DTS-]](https://natwebcaww01.wr.usgs.gov/nwisweb/data/img/USGS.01362368.333554.63680..20240929.20241006..0..gif)
