Guide banks are constructed alongside rivers to direct floodwater flow through a defined waterway when structures like bridges are built. They extend upstream and downstream of structures. Guide banks have curved upstream and downstream heads connected by a straight shank. Their design considers the length of the clear waterway, length of the guide banks, radius of curved heads, cross-section, slope protection with stone pitching, and a launching apron to protect the slope from scouring. Formulas are provided to calculate parameters like stone pitching thickness, scour depth, and quantity of stone required for the apron based on the river's maximum discharge.