Note: The computational method used in StreamStats to estimate flows at ungaged locations on gaged streams (performed in the application by using the button with a green streamgage and Q-hat symbol ) is different than that reported in Lumia and others, 2006 (SIR 2006-5112). For a detailed explanation of the differences in computational methodology and to download a spreadsheet tool to perform the computation as described in SIR 2006-5112, please visit the SIR 2006-5112 support page.
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StreamStats for New York can be used to estimate (1) instantaneous flood discharges with exceedance probabilities of 0.8, 0.667, 0.5, 0.2, 0.1, 0.04, 0.02, 0.01, 0.005, and 0.002 (1.25-, 1.5-, 2-, 5-, 10-, 25-, 50-, 100-, and 500-year recurrence intervals, respectively) for ungaged, unregulated, rural streams throughout New York; (2) bankfull discharge and channel characteristics of streams throughout New York. The reports below present the regression equations used to estimate these statistics, and describes the methods used to develop the equations and to measure the basin characteristics used in the equations. Users should familiarize themselves with the reports before using StreamStats to obtain estimates of streamflow statistics for ungaged sites.
- Lumia, Richard, 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.
- Mulvihill, C.I., Baldigo, B.P., Miller, S.J., and DeKoskie, Douglas, 2009, Bankfull Discharge and Channel Characteristics of Streams in New York State: U.S. Geological Survey Scientific Investigations Report 2009-5144, 51 p.
General information on the Interactive Map application, as well as specific sources and computation methods for basin characteristics are available here.
In addition to solving the above regression equations, New York StreamStats can be used to delineate drainage areas and to provide the basin characteristics that are needed as input for the New York Streamflow Estimation Tool (NYSET) program, which can estimate daily mean streamflows for water years 1961-2010 for user-selected sites on ungaged streams. The estimates provided by NYSET assume that flows at the selected site are minimally altered by human activities. Additional information on the NYSET program, including instructions for downloading, installing, and operating the program are at the following web page:
NOTE: In the StreamStats outputs for ungaged sites in New York, the tables for bankfull statistics have a column heading indicating that all bankfull statistics are in units of cubic feet per second. This table heading is erroneous. The actual units for BFAREA (bankfull area) are square feet, BFDPTH (bankfull depth) are feet, for BFFLOW (bankfull flow) are cubic feet per second, and BFWDTH (bankfull width) are feet. Future program modifications will show the correct units in the table.
StreamStats for New York was developed in cooperation the New York City Department of Environmental Protection, the New York State Department of Environmental Conservation, the New York Department of State, and the New York State Department of Transportation.
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