obeyApril 24, 2015 - The American Society of Civil Engineers (ASCE) selected Dr. Jayantha Obeysekera, Hydrologic & Environmental Systems Modeling, and Jose Sala, Emeritus Professor, Colorado State University, as recipients of the prestigious 2015 Norman Medal. They co-authored the paper, "Revisiting the Concepts of Return Period and Risk for Nonstationary Hydrologic Extreme Events."

The Norman Medal was instituted and endowed in 1874 by George H. Norman and is the highest honor granted by the ASCE for a technical paper that "makes a definitive contribution to engineering." In selecting this work, the committee commended it as, " the presentation of a convincing concept and needed statistical techniques that advance knowledge of nonstationarity in hydrologic observations due to anthropogenic causes and natural processes." The award will be presented during the ASCE annual convention in New York City on October 13.​

The paper was also published in the March 2014 issue of Journal of Hydrologic Engineering and selected as the year's "Best Paper" by the editors. This award will be presented at the World Environmental & Water Resources Congress in Texas in May.