Risk indices and risk matrix have been used among governmental agencies for assessing risks and ranking alternatives protection measures. The popularity of risk matrices can be associated with its characteristics to quick assessing risk and providing inexpensive solutions. The risk assessment is associated with flood protection as: economic, environmental, and life-safety. Economic risks are reasonably well dealt with by the well-known traditional cost-benefit analysis, insurance, and financial markets. Environmental risks are difficult to assess by traditional methods in flood project evaluation. Environmental consequences cannot be directly measured, while social risks represent the most challenge to quantify. It may be possible to estimate the number of fatalities, and cost of damaged infrastructures, while the social aspects cannot be measured. This paper is proposing a flood risk matrix technique for assessing risks in urban arid and extreme arid regions demonstrated through case-study application on the catchment of Taibah University (TU) and Islamic University (IU) in Medina, KSA. The study focused on assessing the geographical impacts of the flash flood inundated depths for different frequencies from 5 to 100 years return periods leading to identification of the flood channels, and its floodplains that may be vulnerable to different degrees of flood hazards.

1. The 3rd
ICIEM 2018, International Conference on Integrated
Environmental Management for Sustainable Development
www.iciem-conference.com
Development of Flash Flood Risk Assessment Matrix in
Arid Environment: Case Study Taibah and Islamic
Universities' Campuses
02-05 May 2018, Sousse, Tunisia
Mohamed Abdulrazzak(1), Amro Elfeki(2), Ahmed Kamis(2), Nassir
Alamri(2), Moustafa Kassab(1), Anis Al-Shabani(2), and Kashif Noor(2)
1-Departement of Civil Engineering, college of Engineering, Taibah University, Medina, KSA,
2
Department of Hydrology and Water Resources Management - Faculty of Meteorology,
Environment & Arid Land Agriculture, King Abdulaziz University, Jeddah, KSA.
PAPER
ID:
219

2. Outline.
1. Field Finding.
2. Objectives.
3. Study Area.
4. Hydrological and Hydraulic Modelling
5. The Proposed Flood Risk Matrix for Risk Assesement.
6. Application.
7. Some Results.
8. Conclusions.
2
ID:219

3. Field Finding for Floods in The Study Area
3
ID:219

4. Proposing a flood risk matrix that is suited the conditions of arid environment:
Defining the reasonable risk probabilities or return periods and the consequences in
terms of damage (inundation depth).
Objectives
4

5. Study Area
5

6. Hydrological Modelling (WMS) + (HEC-HMS)
6

7. Hydraulic Modelling (2D HEC-RAS)
7

8. Hydraulic Modelling (2D HEC-RAS) CONT.
8

9. Flood Risk Matrix (FRM)
9

10. Application of FRM
10

11. Application of FRM (CONT.)
11

12. Risk Summary of IU
12

13. The developed flood-risk matrix has been applied for a case study. It indicated:
- Low to moderate risk for flood frequencies of 5 years return.
- Moderate to high risk may exist for flood with rerun period of 50 and 100 years.
The proposed risk matrix technique provides an appropriate tool for arid and extreme
arid regions.
The technique needs further evaluation through other case studies.
Conclusions
13

14. The 3rd
ICIEM 2018, International Conference on Integrated
Environmental Management for Sustainable Development
www.iciem-conference.com
Thank you!
Mohamed Abdulrazzak
mjabdulrazzak@gmail.com
02-05 May 2018, Sousse, Tunisia
PAPER
ID:
000