1Research Scholar, School of Engineering, RK University, Rajkot-Bhavnagar Highway, Rajkot-360020, Gujarat, India.
2Principal, Merchant Engineering Collage, Basana, Vishnagar, Gujarat, India.
3Deputy Executive Engineer, GERI, Vadodara, Gujarat, India.
Online published on 8 May, 2017.
Dams play important roles in development of any country. It provides flood control, water for drinking purpose, hydroelectric power, navigation and irrigation. Dams in India are 30 to 40 years old and required rehabilitation. Storage capacity of dam day by day decreases due to siltation. Modified shape of Labyrinth weir called piano key weir is implemented to overcome these problem. The Piano key weir is a modified shape of Labyrinth weir with overhanging on upstream or downstream or on both sides. The zigzag shape of Piano key weir permits to multiply the crest length of a given spillway length, which increase discharge capacity without increasing the submergence area on upstream side of dam. From last decade Piano key weir is in the core of research investigations. Mostly experimental models are studied to determine the co-efficient of discharge. In this paper we have highlight the earlier studies on different parameters which impact on flow capacity of the Piano key weir.
Piano key weir, Labyrinth weir, Spillway capacity
