Pennsylvania

Attention!

The application for this State is based on StreamStats version 2. Please read the new User Instructions for this application before attempting to use it. The new network navigation and estimating flows based on similar gages, have not yet been implemented in this state. These processes will be added in the near future.

Please help us conserve our server system resources and close the Interactive Map window when you are finished using it. Doing so will help ensure system availability for all users. Thank you.

Also, please bookmark this page, rather than the Interactive Map page, since the URL for the interactive map may change in the future.

We want your feedback! Please send any comments or questions that you have on StreamStats to the StreamStats development team at GS-W StreamStats@usgs.gov.

Pennsylvania StreamStats incorporates regression equations for estimating numerous streamflow statistics. Equations are included for estimating the 2-, 5-, 10-, 50-, 100-, and 500-year recurrence interval floods, which have the probability of exceedance in any single year of 50, 20, 10, 2, 1, and 0.2 percent, respectively. Equations also are included for estimating the 7-day, 10-year; 7-day, 2-year; 30-day, 10-year; 30-day, 2-year; and the 90-day, 10-year low flows, the 10-year, 25-year, and 50-year base flows, and the harmonic mean flow, and the mean annual flow. The reports below document the regression equations available in StreamStats for Pennsylvania, 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 this report before using StreamStats to obtain estimates of streamflow statistics for ungaged sites.

Roland, M.A., and Stuckey, M.H., 2008, Regression equations for estimating flood flows at selected recurrence intervals for ungaged streams in Pennsylvania: U.S. Geological Survey Scientific Investigations Report 2008-5102, 57 p.

Stuckey, M.H., 2006, Low-flow, base-flow, and mean-flow regression equations for Pennsylvania streams: U.S. Geological Survey Scientific Investigations Report 2006-5130, 84 p.

Interactive Map

Note: An adjustment factor is applied to the basin characteristic mean basin slope to more accurately replicate the values used to develop the regression equations. Mean basin slope is used in the regression equation for low-flow region 1. Both the raw (unadjusted) and adjusted basin slope values can be displayed using the BasinChars tool, however, only the adjusted value is displayed on the FlowStats form if the ungaged site of interest is within low-flow region 1.

StreamStats for Pennsylvania was developed in cooperation with the Pennsylvania Department of Protection, the Federal Emergency Management Agency, the Pennsylvania State Association of Township Supervisors, and the Susquehanna River Basin Commission.