USGS Water-Year Summary for Site 01582500

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	Available Parameters
	00060 Discharge(Mean)
	63680 Turbidity, Form Neph(Mean,Max.,Min.) [Discontinued]
	63680 Turbidity, Form Neph(Min.,Max.,Mean) [TS032, Discontinued]

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Water year 2021: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2021

01582500 GUNPOWDER FALLS AT GLENCOE, MD

LOCATION - Lat 39°32'58.9", long 76°38'10.0" referenced to North American Datum of 1983, Baltimore County, MD, Hydrologic Unit 02060003, on right, downstream wingwall of bridge on Glencoe Road at intersection of Upper Glencoe Road and Lower Glencoe Road in Glencoe, and 0.7 mi upstream from Piney Creek.

DRAINAGE AREA - 160 mi².

REVISIONS HISTORY - WDR MD-DE-89-1: 1985(M).

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1977 to June 1980, December 1982 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 244.13 ft above North American Vertical Datum of 1988.

REMARKS -

Water Years 2018-2020: Records good, except those for estimated discharges, which are poor.

Water Year 2017: Records good, except those above 2400 ft³/s, which are fair, and those for estimated discharges, which are poor.

Water Years 2014-2016: Records good, except those above 2,400 ft³/s, which are fair, and those for estimated daily discharges, which are poor.

Water Year 2013 and prior years' accuracy statements can be found in Annual Water Data Reports.

Flow regulated by Prettyboy Reservoir, 12 mi upstream, beginning April 10, 1933, for water supply of Baltimore City (usable capacity, 20,000,000,000 gal; dead storage, 1,080,000,000 gal). U.S. Geological Survey satellite data-collection platform at station.

WATER-QUALITY RECORDS

PERIOD OF RECORD - October 2015 to October 2020.

PERIOD OF DAILY RECORD - October 2015 to October 2020.

INSTRUMENTATION - Water quality monitor, October 2015 to October 2020.

REMARKS - Turbidity values greater than 1,600 nephelometric turbidity units (NTU) exceed the instrument calibration range. Values are included in the record but are presumed to have lower precision. Turbidity values that were determined to be a result of debris on the sensor, a function of incident sun angle, or other phenomena that did not appear to be correlated to suspended-sediment concentration were removed by the hydrographer.

EXTREMES FOR PERIOD OF DAILY RECORD -

Turbidity FTS: Maximum 2,097 NTU, April 6, 2017; Minimum 0.00 NTU, multiple occurrences recorded, first occurrence on December 3, 2017.

Turbidity EXO: Maximum 1,020 NTU, July 22, 2020; Minimum 0.10 NTU, multiple occurrences recorded, first occurrence on July 20, 2020.