To investigate relation between head over sill of a rectangular notch and the flow rate through the notch.

Object: To investigate relation between head over sill of a rectangular notch and the flow rate through the notch.

Here, you will learn about:

• Notches, flow rate, and cd.
  
• Experimental and graphical procedure of finding the relationship between head and discharge.
  

Apparatus Required:

• 
  Hydraulic Bench with (orifice and) notch apparatus, measuring cylinder, and stop-watch.
  

Arrangement of apparatus for measuring flow through Rectangular Notch

Theory:

 Q C T d

x 2 / 3 xL

x H 3 / 2

(5.1)

where  = Vol. of water collected

2g

T = Time in which  is collected Q = Actual discharge

Cd = Coeff. of discharge for the notch L = Length of the notch

H = Head over the notch

_ Cd  2

1

L

3

. Qac H 3 / 2

(5.2)

 Cd

2g

or C

 0.033

L

 0.011

Qac H 3 / 2

Qac

(cgsunits)

if L  3

(cgs mits)

(5.3)

(5.4)

d H 3 / 2

Procedure:

Observations:

Length of the notch, L = 3cm

Results & Comments: