In this paper, we apply an effective method to evaluate relative tectonic activity by applying several morph-tectonic indices that are useful in evaluating topography and tectonics. These include stream length-gradient, asymmetric factor, hypsometric index, curves, valley floor width height ratio, drainage basin shape, mountain front sinuosity. The study region of Wadi Al-Arish northern Sinai P...

a r t i c l e i n f o Keywords: palaeoflood Sinai rainfall–runoff model boulder transport flash floods The Wadi Isla drainage basin, a narrow steep bedrock canyon and its tributaries, rises near the highest elevations of the Precambrian Sinai massif on the eastern margin of the tectonically active Gulf of Suez rift. The basin area upstream from the mountain front is 191 km 2 and downstream the ...