This work describes the application of Hec-RASas Hydrologic Engineering Center derived River Analysis System model to the establishmentof floodplain maps for Martil river. Modeling with Hec-Ras enables calculation of, among other variables, water levels, depths and flow velocities for the different flow configurations and different cross-sectional zones along Martil River, i. e., from the confluence with the Lakhmiss and Mhajrat rivers to discharge into the Mediterranean Sea. This investigation, therefore, presents flood mapping and classification of risk areas using the Hec-GeoRas and Hec-Ras hydraulic modelling tools integrated into the Arcgis information system. The results indicate that the use of aerial photographsprovidesa good knowledge of the morphology and physical characteristics of the river, which will help decision makers to prevent floodingin the urban area of Tetuan.

Dans ce travail, nous présentons une méthode d’évaluation et de cartographie de la vulnérabilité à la contamination des eaux du barrage 9 avril 1947 (Maroc). Ses eaux sont connues pour un fort taux de la pollution et une activité anthropique considérable, malgré qu’elles soient destinées à l’alimentation en eau potable de plus de 760 000 habitants. Pour ce faire, nous avons appliqué un modèle français qui a été a nommé DKPR et qui comprend quatre facteurs : l’accessibilité du milieu aquatique (D), le fonctionnement hydrique du sol (K), la pente (P) et l’érosivité des pluies (R). La somme pondérée de ces facteurs, obtenue par le biais d’un logiciel SIG, nous a fourni un indice nommé Vr qui varie entre 0 à 4. À l'aide de cet indice, une carte de vulnérabilité à la contamination sur l’ensemble du bassin versant a été élaborée. Les zones présentant une moyenne ou faible vulnérabilité occupent respectivement 43 % et 38 % de la surface du bassin versant. Elles sont liées principalement au domaine forestier et agricole à moyenne et faible pente. Les zones à forte vulnérabilité occupent 14 % de la surface et sont liées aux secteurs anthropisés à forte pente. Les zones à très faible ou très forte vulnérabilité n’occupent que 4 % et 1 % respectivement de la surface du bassin versant. Les premières présentent les zones humides tandis que les secondes les terrains nus imperméables à forte pente.

This study evaluated the Soil and Water Assessment Tool (SWAT) model performance for modeling the portioning of rainfall in the Laou watershed (area: 940 km 2 ) that extended over two different climatic settings in Morocco, (the Mediterranean sub-humid and the semi-arid). This research also investigated the significant parameters that affect the stream flow simulation. SWAT model was constructed during the period from 2004 to 2011. The modeled stream flow data was manually calibrated using flow gauges daily from 2004 to 2008 and validated for the volumetric flows from 2009 to 2011. SWAT model results indicate that 60% of the stream is provided by the base flow. The sensitivity analysis showed that out of 28 parameters, only 6 revealed meaningful effects on the flow simulation (CN2, ESCO, SOL_AWC, ALPHA_BF, CH_N2, CH_k2) and have the most significant influence. The model proved to be very sensitive to the base flow. Furthermore our outcome indicates that SWAT can successfully replicate the daily stream flows in Laou watershed with Nash-Sutcliffe (NSE) coefficients in the range of 0.76-0.84, R2 of 0.74-0.82, RSR of 0.52-0.41 and PBIS of 12.24-8.93 respectively. In addition SWAT was found to be suitable for both climatic regions in Laou watershed. These results reinforced the multi-functionality and reliability of

The implementation of the Urban Development Master Plan, SDAU (Schema Directeur d’Amenagement Urbain) in the Tangier-Tetouan region has marked a radical change in the territorial organization of these provinces: this process that began in 2004 with the construction of the port of Tanger-Med, and the infrastructures to support the port and related industrial areas. This action has meant the change of administrative boundaries as the project progressed. Although the demographic dynamics throughout the Kingdom of Morocco is a process of rural exodus, this migratory pattern is more intense in northern Morocco. The Andalusian Geographical Studies group of the University of Seville, together with Abdelmalek Essaadi University, has investigated the impact of such planning on spatial planning in a framework of international university cooperation since 2002. This article will update previous research based on remote sensing techniques and demographic statistics that analyze the changes that occurred over the last two decades. These changes consist of more than a massive displacement of the rural population toward the large cities and coastal towns. It also means the construction of large infrastructures, holiday houses, and a new pattern of settlement in rural areas. This article aims to describe these changes, as well as the trends in the immediate future, using statistical analysis and the evolution of land uses with GIS and remote sensing tools.