On July 21, 2016, new peak-flow regression equations for urban basins were added to Illinois StreamStats. These new equations are from the report:

• Over, T.M., Saito, R.J., Veilleux, A.G., Sharpe, J.B., Soong, D.T., and Ishii, A.L., 2016, Estimation of peak discharge quantiles for selected annual exceedance probabilities in northeastern Illinois: U.S. Geological Survey Scientific Investigations Report 2016–5050, 50 p. with appendix.

There are several issues to be aware of when obtaining either rural or urban peak-flow estimates, which are explained on the Illinois introductory page. Users should review the discussion on that page before using Illinois StreamStats.