Robert L. Tortorelli

• Depth-duration frequency of precipitation for Oklahoma
• Estimated flood peak discharges on Twin, Brock, and Lightning creeks, southwest Oklahoma City, Oklahoma, May 8, 1993
• Flood frequency estimates and documented and potential extreme peak discharges in Oklahoma
• Hydrologic drought of water year 2006 compared with four major drought periods of the 20th century in Oklahoma
• Hydrologic drought of water year 2006 compared with four major drought periods of the 20th century in Oklahoma
• Hydrologic drought of water year 2006 compared with four major drought periods of the 20th century in Oklahoma
• Nutrient concentrations, loads, and yields in the Eucha-Spavinaw Basin, Arkansas and Oklahoma, 2002-2004
• Nutrient concentrations, loads, and yields in the Eucha-Spavinaw basin, Arkansas and Oklahoma, 2002-2006
• Phosphorus concentrations, loads, and yields in the Illinois River basin, Arkansas and Oklahoma, 2000-2004
• Statistical summaries of streamflow in Oklahoma through 1999
• Techniques for estimating flood peak discharges for unregulated streams and streams regulated by small floodwater retarding structures in Oklahoma
• Techniques for estimating peak-streamflow frequency for unregulated streams and streams regulated by small floodwater retarding structures in Oklahoma