Assessing Flood Hazard at River Basin Scale: Comparison between HECRAS-WMS and Flood Hazard Index (FHI) Methods Applied to El Maleh Basin, Morocco

Prediction of Flash Flood Susceptibility Using Fuzzy Analytical Hierarchy Process (Fahp) Algorithms and Gis: A Study Case of Guelmim Region in Southwestern of Morocco

“…The resulting map showed that residential areas at the outlet (red region in the North West, Figure4) of the watershed and which are close (around the rivers, Figure4) of the main effluents Sayed and Oum Laachar wadis were very susceptible to flooding and were classified in the high flash flood susceptibility class. this result is consistent with the studies (Echogdali et al 2018;Elkhrachy 2015;Papaioannou et al 2015). Remarking that the second map predicted more the flash flood susceptibility areas than the first one.…”

“…The AHP results indicated that 37% of susceptibility the flash flood is induced by Soil moisture index, 24.30% by Rainfall and 15,75 by Drainage density, therefore, is just 9,98 %, 6,39, 4,06 and 2,70 which is induced respectively by LULC, DEM, Slope, and Soil. This result is faithful with the prior researches (Echogdali et al 2018;Lyu et al 2018;Rahmati et al 2016).…”

“…The process of identifying the flash flood susceptibility areas need to Divided into different steps ( Figure 3) the first step involves preparing the flood conditioning factors (Figure 2) (Darabi et al 2019) by using GIS technicality and geographic data; but the second step has to deal with calculating the percentage of certain Criteria Weights by using the Analytical Hierarchy Process algorithms (Echogdali et al 2018;Saaty 1989). Furthermore, the third step includes a transformation process of the flood conditioning factors from 0 to 1 scale by using the Fuzzy Membership (linear functions) algorithm (Ait Kacem et al 2019;Zadeh 1978).…”

“…Where: the maximum eigenvalue (λmax) is getting by this equation equation 1; the Consistency Index (CI) getting by this equation equation 2; And the Random Index (RI) getting according to the Random Index Table which based on the number of criteria (Echogdali et al 2018;Elkhrachy 2015;Papaioannou et al 2015;Rahmati et al 2016;Saaty 1989) (1)…”

“…In recent years, flash flood risk susceptibility researches have been realized by many countries (Abdelkareem 2017;Carpenter et al 1999;Chen, Hill, and Urbano 2009;Curebal et al 2016;Dawod, Mirza, and Al-Ghamdi 2011;Elkhrachy 2015). However, various methods have been used to identify and evaluate flash flood vulnerable areas in Morocco (Boutaleb et al 2018;Echogdali et al 2018;Hakdaoui et al 2019;El Khalki et al 2018;Tramblay et al 2012;Werren et al 2016). And only a few methods have been used to evaluate flash flood susceptibility in Guelmim region.…”