EFFECT OF ABSTRACTION PATTERNS ON FLOW FIELD BY USING SOBEK AND I SIS Roughened and corrugated aprons as scour countermeasures downstream of submerged hydraulic jumps Use corrugated beds to improvement downstream local scour Characteristics Influence of gravel beds on erosion of sand by submerged jets Improving irrigation system management: A case study: Bahr Sanhoor Canal, Fayoum, Egypt Pressure-Flow Scour under a Bridge Deck in Clear Water Conditions