This book is about the flow field and scour around bell mouth groin (An Experimental study).This experiment has been conducted on the Bangladesh University of Engineering and Technology (BUET), Dhaka, Bangladesh.This book has been discuss about 4 types of bell mouth groin orientation.Three different discharge and four different angle and two groin condition (submerged and non-submerged) has been considered.The groin model used in the test runs was constructed as bell mouth type.