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Advances in Meteorology
Volume 2017, Article ID 9496787, 10 pages
Research Article

Assessment of Rainfall Intensity Equations Enlisted in the Egyptian Code for Designing Potable Water and Sewage Networks

1Resources and Environmental Department, Dar Al Handasah Consultants (Shair and Partners), Cairo, Egypt
2Water Resources Engineering, Civil Engineering Department, Faculty of Engineering, Fayoum University, Fayoum, Egypt
3Sanitary and Environmental Engineering, Public Works Department, Faculty of Engineering, Cairo University, Giza, Egypt

Correspondence should be addressed to Ayman G. Awadallah; moc.oriacrad@halladawaa

Received 24 August 2016; Accepted 10 January 2017; Published 16 February 2017

Academic Editor: Niko Wanders

Copyright © 2017 Ayman G. Awadallah et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The design of combined sewage system networks is based on the sanitary discharge (domestic, industrial) and the runoff generated by rainfall. The Egyptian code of practice for designing potable water and sewage networks gives two Intensity-Duration-Frequency (IDF) equations to calculate the intensity of rainfall to be applied to all cities of Egypt. The purpose of this research is to study and assess the adequacy of the rainfall intensity equations suggested by the aforementioned Egyptian code. This is carried out taking into consideration the available rainfall ground station measurements and remote sensing Tropical Rainfall Measurement Mission (TRMM) satellite rainfall estimates. This assessment leads to the following results. For the Mediterranean coastal cities, the code of practice equations significantly underestimates the rainfall intensities for all storm durations, which may lead to road networks damage and accidents due to hydroplaning and road flooding. On the contrary, for many other southern cities along the Nile Valley, the code equations significantly overestimate the rainfall intensities, which affects the economical aspect of the sewage network. Consequently, the current research suggests new rainfall intensity equations instead of the code equations.