1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Faculty of Engineering, Univ. of Auckland, 20 Symonds St., Auckland 1010, New Zealand (corresponding author).
2. Watercare Chair in Infrastructure, Dept. of Civil and Environmental Engineering, Faculty of Engineering, Univ. of Auckland, 20 Symonds St., Auckland 1010, New Zealand.
3. Senior Lecturer, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Auckland 1010, New Zealand.