Fire Hydraulics: Hydrant Water Available at 20 psi 

Can someone please help me figure this out? My Static PSI is 40, my Residual PSI is 25, My Orifice inches is 2.5 and my Pitot reading is 20. My waterline is 6 inches and my Coefficient is 0.9....What would my Flow GPM and flow at 20 PSI numbers be.....Please help

Thanks

And to repeat all the others - where can I get this chart?

Where may I find this Chart? Thanks for any help

Where may I find this Chart? Thanks for any help