RT Journal Article SR Electronic T1 Trees and Wind: A Practical Consideration of the Drag Equation Velocity Exponent for Urban Tree Risk Management JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 101 OP 113 DO 10.48044/jauf.2005.013 VO 31 IS 3 A1 Scott Cullen YR 2005 UL http://auf.isa-arbor.com/content/31/3/101.abstract AB Arborists and urban foresters are increasingly concerned with tree risk management. The aerodynamic drag equation is a potentially useful management tool. Some sources question the form of equation—specifically, the velocity exponent—that should be applied to trees. For the tree risk manager, concerned with public safety and legal liability, this is more than an academic curiosity. Uncertainty about the appropriate exponent questions the reliability of the conventional form. This paper reviews the literature, reports on modeling of both equation forms, and concludes that the conventional form—velocity squared—is appropriate for trees. Detailed analysis is presented for the researcher or advanced practitioner. A summary explanation is provided for the typical practitioner.