1. Civil Engineering Intern, Stewart Inc., 421 Fayetteville St., Suite 400, Raleigh, NC 27601 (corresponding author).
2. Professor, Extension Specialist, and University Faculty Scholar, Dept. of Biological and Agricultural Engineering, North Carolina State Univ., 3100 Faucette Blvd., D. S. Weaver Labs Campus Box 7625, Raleigh, NC 27595.
3. Extension Associate, Dept. of Biological and Agricultural Engineering, North Carolina State Univ., 3100 Faucette Blvd., D. S. Weaver Labs Campus Box 7625, Raleigh, NC 27595.