sprinkler irrigation?

Question

how will you measure coefficient of discharge?

Answer 1

Easy. Fluid mechanics. RainBird and Toro use it daily in the design of sprinklers.
Go to:
http://www.du.edu/~jcalvert/tech/fluids/orifice.htm

http://www.engr.iupui.edu/me/courses/me310lab/experiment10.pdf

http://www.usbr.gov/pmts/hydraulics_lab/pubs/wmm/chap14_03.html

http://www.flowmeterdirectory.com/flowmeter_orifice_calc.html

http://www.engineeringtoolbox.com/bernouilli-equation-d_183.html

http://www.newfreedownloads.com/find/coefficient-of-discharge.html

Answer 2

You will not. If you want to know how much water is being discharged, you will have to capture the water from a sprinkler for a measured period of time, and measure the amount of water discharged. Convert that to gallons per minute (in the US)