TECHNICAL ACTIVITY CARRIED OUT BY CENTRES / OVERSEAS CHAPTERS
Name of Centre / Overseas Chapter:
Title of Activity:
North Bengal Local Centre
Seminar on ‘STEPPED SPILLWAY FOR HYDRO POWER PROJECTS’
Activity under Divisional Board
CVDB
(delete which are not applicable):
Date: 23/12/2015
Venue:
Title of photo: Er. Tushar Kanti Sarkar at his presentation
Engineers’ House, Jalpaiguri Govt. Engg. College
campus, P.o +Dist. Jalpaiguri-735102
Title of photo: Er. Ashim Roy presenting Memento to Er. Tushar
Kanti Sarkar
Brief Report (not exceeding 4000 characters)
A Lecture Meeting on “Stepped Spillway for Hydro Power Projects” was organized by Institution of
Engineers (I), North Bengal Local Centre, on 23rd December, 2015 at 3.00 p.m. at Engineers’ House.,
Jalpaiguri Govt. Engg. College Campus, P.o + Dist. Jalpaiguri-735102. At the beginning of the programme,
welcome address was given by Er. Ashim Roy, Honorary Secretary, NBLC (IE). The theme speaker for the
programme was Er. Tushar Kanti Sarkar, Superintendent Engineer (Civil),Region office- Jalpaiguri,
W.B.S.E.D.C.L., SJDA Composite Complex, Rajbari Para, Jalpaiguri- 735101.
This is a very rich field of study for researchers of Fluid Mechanics and Hydraulics, because of the complex
flow characteristics, including turbulence, gas exchange derived from the two phase flow (air/water), cavitation,
among other aspects. Er. Tushar Kanti Sarkar delivering his presentation elaborately. He describes the
importance of Flows on stepped spillways which have been widely studied in various research institutions
motivated by the attractive low costs related to the dam construction using roller-compacted concrete and the
high energy dissipations that are produced by such structures. He also explain the most common type of flow
in spillways which is known as skimming flow and consists of: (1) main flow (with preferential direction
imposed by the slope of the channel), (2) secondary flows of large eddies formed between steps and (3)
biphasic flow, due to the mixture of air and water. The details of the three mentioned standards may vary
depending on the size of the steps, the geometric conditions of entry into the canal, the channel length in the
steps region and the flow rates. The second type of flow that was highlighted in the literature is called nappe
flow. It occurs for specific conditions such as lower flows (relative to skimming flow) and long steps in relation
to their height. In the region between these two “extreme” flows, a “transition flow” between nappe and
skimming flows is also explained by him.
20 participants enjoyed the presentation and it was very interactive session. Finally, Er. Ashim Roy, Hon.
Secretary, North Bengal Local Centre proposed the vote of thanks.