II$.$ Record the $x$ coordinate on the coordinate grid where the

water jet first crosses an $x$ gridline. Record the $Y$ coordinate

of the jet at that point.

III. Repeat step $1$ at $20$ mm intervals of the $x$ coordinate.

IV$.$ Plot the $Y$ coordinate against the $x$ coordinate to obtain the

trajectory of the jet.

V$.$ Plot $\sqrt[\phantom{2}]{Y}$ against the X coordinate and obtain the slope m of

the straight line. Calculate the coefficient of velocity from:

$C_v=\frac{1}{m*2*\sqrt[\phantom{2}]{h}}$

Parabolic trajectory is related by:

$v=\sqrt[\phantom{2}]{\frac{g*x^2}{2*y}}$

The actual velocity:

$v_{\text{a}\text{c}\text{t}}=C_v*\sqrt[\phantom{2}]{2*g*h}$

The coefficient

of velocity:

$C_v=\sqrt[\phantom{2}]{\frac{x^2}{4*y*h}}$

$3\mathrm{.}3$ Measurement of discharge coefficient.

I. To determine the discharge coefficient it is necessary to

measure the water flow rate from the orifice.

II$.$ Insert the supplied length of PVC pipe into the outlet of the

Standard Hydraulic Test bench, and allow water from the jet

to accumulate in the basin.

III. Use a stopwatch and record the level of water in the basin at

time zero. Measure the time elapsed to add $2$ litres of

water to the basin. Calculate the flow rate from the volume

and elapsed time.

IV$.$ Calculate the coefficient of discharge from Equation $6$ and

from that result calculate the coefficient of contraction

Cc$.$