Low-Flow Statistics for New York State, Excluding Long Island, Computed Through March 2022

Dates

Publication Date: 2024-08-02
Start Date: 1887-10-07
End Date: 2022-03-31

Citation

Stagnitta, T.J., Graziano, A., Woda, J., Glas, R., and Gazoorian, C., 2024, Low-flow statistics for New York State, excluding Long Island, computed through March 2022: U.S. Geological Survey data release, https://doi.org/10.5066/P9NOM6FR.

Summary

This USGS data release contains 7Q10 and 30Q10 [lowest annual 7-day and 30-day average streamflow that occurs (on average) once every 10 years] statistics at 292 USGS streamgages in or adjacent to New York State excluding Long Island. all_sites_wstats.csv - includes 7Q10 and 30Q10 values for all sites and includes information on results from the trend analysis and which sites have daily exceedance probability values available. site_regulated_7day_exc_perc#.csv and site_regulated_30day_exc_perc#.csv files include daily exceedance probability values for all altered sites that were not suitable for calculating low flow statistics. R scripts used to compile and screen streamgage datasets of daily flow, perform trend analysis, and [...]

Summary

This USGS data release contains 7Q10 and 30Q10 [lowest annual 7-day and 30-day average streamflow that occurs (on average) once every 10 years] statistics at 292 USGS streamgages in or adjacent to New York State excluding Long Island.

all_sites_wstats.csv - includes 7Q10 and 30Q10 values for all sites and includes information on results from the trend analysis and which sites have daily exceedance probability values available.

site_regulated_7day_exc_perc#.csv and site_regulated_30day_exc_perc#.csv files include daily exceedance probability values for all altered sites that were not suitable for calculating low flow statistics.

R scripts used to compile and screen streamgage datasets of daily flow, perform trend analysis, and calculate the low streamflow statistics 7Q10 and 30Q10 are included in processing_scripts.zip. Users are encouraged to read the readme file in this zipped file for details on the scripts and associated files used to generate the statistics.

Contacts

Point of Contact :: Timothy J Stagnitta
Originator :: Timothy J Stagnitta, Alexander P Graziano, Joshua C Woda, Robin L Glas, Christopher L Gazoorian
Metadata Contact :: Timothy J Stagnitta
Publisher :: U.S. Geological Survey
USGS Mission Area :: Water Resources
SDC Data Owner :: New York Water Science Center
Distributor :: U.S. Geological Survey - ScienceBase

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Low-Flow Statistics for New York State, Excluding Long Island, Computed Through March 2022.xml Original FGDC Metadata	View	30.03 KB	application/fgdc+xml
site_regulated_7day_exc_perc1.csv		38.38 MB	text/csv
site_regulated_7day_exc_perc2.csv		38.79 MB	text/csv
site_regulated_30day_exc_perc1.csv		38.43 MB	text/csv
site_regulated_30day_exc_perc2.csv		36.79 MB	text/csv
processing_scripts.zip		227.02 MB	application/zip
all_sites_wstats.csv		34.96 KB	text/csv

Related External Resources

Type: Method

Feaster, T.D., and Lee, K.G., 2017, Low-flow frequency and flow-duration characteristics of selected streams in Alabama through March 2014: U.S. Geological Survey Scientific Investigations Report 2017-5083, 371 p.,	https://doi.org/10.3133/sir20175083
Ries, K.G., III, 2006, Selected streamflow statistics for streagaging stations in northeastern Maryland, 2006: U.S. Geological Survey Open File Report 2006-1335, 16 p.	https://doi.org/10.3133/ofr20061335
Eash, D.A., and Barnes, K.K., 2017, Methods for estimating selected low-flow frequency statistics and harmonic mean flows for streams in Iowa: U.S. Geological Survey Scientific Investigations Report 2012-5171, 106 p.	https://doi.org/10.3133/sir20125171
Evenson, E.J., Orndorff, R.C., Blome, C.D., Böhlke, J.K., Hershberger, P.K., Langenheim, V.E., McCabe, G.J., Morlock, S.E., Reeves, H.W., Verdin, J.P., Weyers, H.S., and Wood, T.M., 2013, U.S. Geological Survey water science strategy—Observing, understanding, predicting, and delivering water science to the Nation: U.S. Geological Survey Circular 1383–G, 49 p.	https://doi.org/10.3133/cir1383G
Gotvald, A.J., 2016, Selected low-flow frequency statistics for continuous-record streamgages in Georgia, 2013: U.S. Geological Survey Scientific Investigations Report 2016–5037, 20 p.	https://doi.org/10.3133/sir20165037
Lumia, R., Freehafer, D.A., and Smith, M.J., 2006, Magnitude and Frequency of Floods in New York: U.S. Geological Survey Scientific Investigations Report 2006–5112, 152 p.	https://pubs.usgs.gov/sir/2006/5112/
Ries, K.G., III, Newson J.K., Smith, M.J., Guthrie, J.D., Steeves, P.A., Haluska, T.L., Kolb, K.R., Thompson, R.F., Santoro, R.D., and Vraga, H.W., 2017, StreamStats, version 4: U.S. Geological Survey Fact 2017–3046, 4 p., https://doi.org/10.3133/fs20173046. [Supersedes USGS Fact Sheet 2008–3067.]	https://doi.org/10.3133/fs20173046
Riggs, H.C., 1972, Techniques of Water-Resources Investigations of the United States Geological Survey: Low-Flow Investigations, Book 4 Hydrologic Analysis and Investigations: U.S. Geological Survey	https://pubs.usgs.gov/twri/twri4b1/pdf/twri_4-B1_a.pdf
Suro, T.P., and Gazoorian, C.L., 2011, Changes in low-flow frequency from 1976-2006 at selected streamgages in New York, excluding Long Island: U.S. Geological Survey Scientific Investigations Report 2011–5112, 21 p.	http://pubs.usgs.gov/sir/2011/5112
De Cicco, L.A., Hirsch, R.M., Lorenz, D., Watkins, W.D., and Johnson, M., [2014], dataRetrieval—Retrieval functions for USGS and EPA hydrologic and water quality data(v. 2.7.13, 2023): U.S. Geological Survey software release	https://doi.org/10.5066/P9X4L3GE
R Core Team, 2020, R—A language and environment for statistical computing: R Foundation for Statistical Computing web page	https://www.R-project.org/

Type: Related Primary Publication

Stagnitta, T.J., Graziano, A.P., Woda, J.C., Glas, R.L., and Gazoorian, C.L., 2024, Low-flow statistics for selected streams in New York, excluding Long Island: Scientific Investigations Report, https://doi.org/10.3133/sir20245055.	https://doi.org/10.3133/sir20245055

Purpose

Reliable information about the magnitude, frequency, and duration of low-flows are critical for water-supply management; reservoir design; waste-load allocation; and the preservation of water quality and quantity for irrigation, recreation, and ecological conservation purposes. Low-flow statistics, including n-day flow frequency, are used by Federal, State, and local entities for setting regulatory standards and establishing water-quality and water-supply management goals, particularly during dry periods when demand often exceeds the supply of water (Ries, 2006). Because of the importance of these applications, it is critical to effectively measure and document daily flow data for use in updating low-flow frequency relations on a regular basis, preferably every 10 years, and especially after periods of extreme low flow (Feaster and Lee, 2017). Low-flow statistics in New York have not been updated statewide since 1972 (Eissler, 1978).

citationType	Method
journal	U.S. Geological Survey, 176 p.
note	Eissler, B.B., 1978, Bulletin 74: Low-flow Data and Frequency Analysis of Streams in New York Excluding New York City and Long Island

Low-Flow Statistics for New York State, Excluding Long Island, Computed Through March 2022

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