StreamStats in Connecticut
The reports below document the regression equations available for estimating streamflow statistics at ungaged sites that are included in StreamStats for Connecticut. The included equations can provide estimates for instantaneous peak flows with recurrence intervals of 2-. 10-, 25-, 50-, 100-, and 500-years, and flow-duration statistics with flow exceedances ranging from 25 to 99 percent for six “bioperiods”—Salmonid Spawning (November), Overwinter (December–February), Habitat Forming (March–April), Clupeid Spawning (May), Resident Spawning (June), and Rearing and Growth (July–October). The reports describe the methods used to develop the equations and to measure the basin characteristics used in the equations, and the errors associated with the estimates obtained from the equations. Users should familiarize themselves with these reports before using StreamStats to obtain estimates of streamflow statistics for ungaged sites:
- Ahearn, E.A., 2004, Regression equations for estimating flood flows for the 2-, 10-, 25-, 50-, 100-, and 500-year recurrence intervals in Connecticut: U.S. Geological Survey Scientific Investigations Report 2004-5160, 62 p.
- Ahearn, E.A., 2010, Regional regression equations to estimate flow-duration statistics at ungaged stream sites in Connecticut: U.S. Geological Survey Scientific Investigations Report 2010–5052, 45 p.
In addition to the above reports, a Fact Sheet is available that describes StreamStats implementation for the peak-flow equations (Ahearn, 2004). This Fact Sheet is:
- Ahearn, E.A., Ries, K.G., Steeves, P.A., October 2006, StreamStats: U.S. Geological Survey Web Application for Streamflow Statistics for Connecticut: U.S. Geological Survey fact sheet 2006–3129, 4 p.
The Connecticut Streamflow and Sustainable Water Use Estimator (CTSSUEE) was developed to be used in conjunction with the Connecticut StreamStats application to estimate daily unaltered and water-use adjusted streamflow at ungaged locations in Connecticut for the period of October 1, 1960 to September 30, 2014. Basin delineations, basin characteristics, and aggregated water use information for the period of 2010-2014 can be obtained in the Connecticut Streamstats application and imported into the CTSSUE software.
General information and documentation of methods used in the CTSSUEE can be found at the following links:
- Levin, S.B., Olson, S.A., Nielsen, M.G., and Granato, G.E., 2018, The Connecticut Streamflow and Sustainable Water Use Estimator—A decision-support tool to estimate water availability at ungaged stream locations in Connecticut: U.S. Geological Survey Scientific Investigations Report 2018–5135, 34 p., https://doi.org/10.3133/sir20185135.
The CTSSUE software can be downloaded here:
Click on this link to obtain general information on the Connecticut application, as well as specific sources and computation methods for basin characteristics.
StreamStats for Connecticut was developed in cooperation with the Connecticut Department of Transportation and the Connecticut Department of Environmental Protection.