Available online: http://saspublisher.com/sjet/ 354 Scholars Journal of Engineering and Technology (SJET) ISSN 2347-9523 (Print) Abbreviated Key Title: Sch. J. Eng. Tech. ISSN 2321-435X (Online) ©Scholars Academic and Scientific Publisher A Unit of Scholars Academic and Scientific Society, India www.saspublisher.com Determinations of Zones Risks of Inundations in the City of Meknes by Using G.I.S and Tools of Hydraulic Modelling Rhazi Abdelaziz * , Essahlaoui Ali, Elouali Abdelhadi, El Hmaidi Abdellah Department of Geology, Faculty of Sciences, University of Moulay Ismail, City of Meknes, Morocco Original Research Article *Corresponding author Rhazi Abdelaziz Article History Received: 14.11.2018 Accepted: 28.11.2018 Published: 30.11.2018 DOI: 10.21276/sjet.2018.6.11.8 Abstract: At the present time, environmental risks are becoming more and more of a danger to material and human goods, especially in urban environments. In the first place, the risks of floods in the city of Meknes. Because it is crossed by three valleys which are: boufekrane valleys, Bouishak valley and the Ouislane valley on one side. urbanization and development of vulnerable areas that are exposed to these risks. It is in this context that our research, through this scientific paper, becomes our intervention to manage, prevent and predict while delineating risk areas by modeling tools and geomatics and solve this phenomenon that threaten the lives of the people. Keywords: planning, floods, urbanization, management, prevention and prevision. INTRODUCTION The geographical situation of the city of Meknes, its topography, its urban evolution is as many main factors generating some urban risks. Also, its membership in the Sebou basin which considers itself one of the most watered basins of Morocco, and the fact that it is crossed mainly by three valleys Boufekrane Wadi, Bouishak and Ouislane, makes this agglomeration an area vulnerable to risks. flooding and especially in the urban contact zones of the Boufekrane valley and on the quarry cliffs. This has been aggravated by human actions through the proliferation of illegal habitat that is gaining more and more space on the banks and beds of the valleys, on rough terrain with steep slopes, etc. This anarchic urban expansion finds its justification in the complexity of the legal status of the property tax base and in the inadequacy of urban planning documents with reality. Even worse, the Meknes development plan has become obsolete while its master plan approved urban development in 2001 is being revised despite being valid until 2020. The risks of flooding call into question the sustainability of the city of Meknes and complicate its resilience if they are not taken into account in the urban policy and planning of the city and in the absence of a management plan, forecasting and prevention of these risks. General framework of the study Geographic and topographic setting The agglomeration of Meknes is composed of three essential communes namely: Meknes, Toulal and Ouisslane. It is located on the plateau known as Meknes. Despite its small size (S≈ 3200 Km²), 80 km long and 30 km wide, this plateau is the sub-regional area of Meknès-Tafillalet best endowed with natural and human resources, and the most privileged by its geographical position and the quality of its links with modern communication networks [1]. Also, it is bounded by the valley of the Beht wadi and the central plateau to the west, the plain of Fez to the east, the mountains of Pre-rif in the North and the Middle Atlas Mountains to the south. Which ensures Meknes plateau a broad cover over the fresh and humid west winds, also on the dry easterly winds, cold in the winter and hot in the summer. Indeed, this plateau is cut by the of several valleys and valleys along a South-West, North-East axis, the city of Meknes is compartmentalized in several parts of plateau extended, separated from each other by valleys with significant depths, the width of which varies from upstream to downstream and from valley to valley. Also, it is of great interest to point out that the city of Meknes is on the north side of the plateau Sais-Meknes which separates it from the pre-Rifine hills, overlooking the depression gathering the tributaries of the R'dom (Bouishak valley, valley of Boufekrane and ouislane valley), is marked by a relatively tormented topography. This plateau of Meknes, or Western Sais occupies part