Finding Turbine Angular Velocity given Net Head, GPM, and power from Alternator.

[MaxMoon]

An alternator attached to a water turbine generates 35 Watts given 50 feet of head and 10 gallons per minute. Assuming that the efficiency of the alternator is 50%, is it possible for me to find the angular velocity from this information?

If so, how would I do it?

[d00dz]

humm...im not sure if im right but assuming your trying to find the angular velocity of the turbine blades? then i think you need more information such as average radius of the turbine where the blades are. But im not even sure if your taking about that...