1. Dept. of Civil Engineering/School of Geography and Geology, McMaster Univ., Hamilton ON, Canada L8S 4L7 (corresponding author).
2. NSERC/Hydro-Québec Chair in Statistical Hydrology (INRS-ETE), Sainte-Foy PQ, Canada G1V 4C7.
3. Hydro-Québec Research Institute (IREQ), Varennes PQ, Canada J3X 1S1.