Ogbozige, Francis James. “Development of Intensity-Duration-Frequency (IDF) Models for Manually Operated Rain Gauge Catchment: A Case Study of Port Harcourt Metropolis Using 50 Years Rainfall Data”. Tanzania Journal of Engineering and Technology 40, no. 2 (February 21, 2022). Accessed April 7, 2026. http://196.44.161.124/index.php/tjet/article/view/4584.