Pennsylvania Water Science Center



CONTACT FOR MORE INFORMATION

Marla H. Stuckey
(mstuckey@usgs.gov)

 

Flow Statistics for Pennsylvania Streams

Streamstats for Pennsylvania Streamflow statistics for ungaged streams in Pennsylvania with no significant regulation can be determined using StreamStats for Pennsylvania. The following statistics can be determined: peak flows (50, 20, 10, 2, 1, and 0.2 percent annual exceedance flood), low flows (7-day, 10-year; 7-day, 2-year; 30-day, 10-year; 30-day, 2-year; and the 90-day, 10-year low flows), base flows (10-year, 25-year, and 50-year base flows), and mean flows (mean annual flow, harmonic mean flow). The reports below document the regression equations available in StreamStats for Pennsylvania and the errors associated with the estimates obtained from the equations.

Staff gageStreamflow statistics for streamgages can also be found using StreamStats for Pennsylvania or in published USGS reports (see links below). For guidance on techniques regarding weighting and transference of statistics, see Techniques for Estimating Magnitude and Frequency of Peak Flows for Pennsylvania Streams, USGS Water Resources Investigations Report 00-4189 by Stuckey and Reed; and documentation found at USGS Low-Flow Statistics for Pennsylvania Streams web application. The most-current methods and results of statistical analyses for low-flow statistics from regulated streams are described in Comparison of Methods for Computing Streamflow Statistics for Pennsylvania Streams, USGS Water Resources Investigations Report 99-4068 by Ehlke and Reed.

If you are interested in:

In the above list of sources of current streamflow statistics, the term "regulated" means one or more significant flow-altering impoundment or reservoir is located upstream of the streamgage or ungaged location of interest.

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