Quick Answer: Discharge Over Notches Apparatus is a self-contained, water re-circulating set-up for determining the coefficient of discharge (Cd) of rectangular, trapezoidal and 45 deg. and 60 deg. V notches fitted interchangeably at one end of a 600 x 250 x 180 mm channel.
Last updated: October 2026
Key Features
Channel test section 600 x 250 x 180 mm, fed with water from the bottom
Interchangeable brass notches: rectangular, 45 deg. V and 60 deg. V, with trapezoidal also listed
Hook/pointer gauge with Vernier scale to measure water height in the channel
Sump tank of 70 litres, FHP pump, flow control and by-pass valves
Measuring tank of 25 litres with piezometer and electronic stop watch
A notch is fitted at one end of the channel, and the hook gauge with Vernier scale measures the height of water in the channel while the flow control and by-pass valves set different flow rates. The measuring tank and stop watch give the actual discharge, from which Cd is found for each notch shape in turn on this FLUID MECHANICS LAB set-up.
Frequently Asked Questions
Q1. Which notches are supplied? Brass notches: rectangular, 45 deg. V and 60 deg. V. A trapezoidal notch is also listed in the specification.
Q2. How is the water level over the notch measured? With a hook/pointer gauge fitted with a Vernier scale, which measures the height of fluid in the flow channel.
Lab Equipments Ambala exports to 80+ countries, including Zambia, Lesotho, Kuwait and Belgium.
