There are a lot more factors that must be considered in order to give you an accurate number, such as the length of pipe, type of pipe, number of valves in line, tees, elbows. Water pressure will drop as the water flows along the line, and as it encounters turns, valves, tees, sprinklers, etc. I'll give you a rough estimate of 23 gpm, but this is an extremely rough estimate. You will need to figure out the complete layout with all valves, turns, sprinklers, etc, then consult an expert to get a better estimate.
Water flow rate half inch PVC pipe 65 psi?
4324
5 Pounds per Square Inch
2.5 gallons per minute
what is the discharge flow of 10m/s passing from 2ft pipe
The answer depends on the flow rate or the water pressure, not just the pipe size.
80 gpm
For laminar flow? For a full pipe? for a 3/4-full pipe? For a 1/2-full pipe? It all makes quite a difference. Please repost your question with a little more information. It would also help to for us to know the coefficient of friction of the inside of the pipe.
Assuming that the pressure remains at a constant, reducing the diameter of the pipe will increase the water flow. On the contrary, increasing the diameter would cause the water to flow at a much slower rate.
At constant pressure and constant fluid density, larger pipe results in larger flow rate.
4
You speed up the pump, which increases its pressure on the solid or liquid. Narrowing the pipe does not increase the pressure or flow rate, it only increases the speed at which the liquid or gas passes by a given point.