Pennsylvania

StreamStats for Pennsylvania can be used to estimate low-flow statistics, including the 7-day, 10-year; 7-day, 2-year; 30-day, 10-year; 30-day, 2-year; and the 90-day, 10-year low flow, base-flow statistics, including the 10-year, 25-year, and 50-year base flows, and mean flows, including the harmonic mean and mean annual flow. The report below documents 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.

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 Environmental Protection.