J. D Helvey

• Effects of defoliation by Douglas-fir tussock moth on timing and quantity of streamflow
• Flood frequency and culvert sizes needed for small watersheds in the central Appalachians
• Grass seeding and soil erosion in a steep, logged area in northeastern Oregon
• Input-output budgets of selected nutrients on an experimental watershed near Parsons, West Virginia
• Soil density and moisture content on two unused forest roads during first 30 months after construction