Why does Torricelli's law overestimate distance for water siphoned through a tube?

[RMalayappan]

My physics teacher cooked up an experiment today on the fly where we tried to calculate the horizontal distance traveled, D, from a rubber tube through which water was siphoned from a graduated cylinder elevated a certain distance H from the ground:

He modified an experiment he had found of the same sort but with a hole in the cylinder instead, in which case he could use Torricelli's Law to find that $v=sqrt(2gh)$ for water exiting with the surface a distance of h above the hole and basic kinematics to find the horizontal distance upon impact with the ground. We tried the same equations with h being the height of the tube above the opening and the calculations gave a distance that was much farther than the actual distance. What is the proper way to go about this problem and why did the application of the same equations give such a gross overshoot?

 

[Bystander]

tube through which water was siphoned

How does flow through a tube differ from flow through an orifice?

 

[256bits]

We tried the same equations with h being the height of the tube above the opening and the calculations gave a distance that was much farther than the actual distance

So what you are saying is that if you move the top curve of the siphon higher or lower, using the "same equations" the distance d should vary?
Seems that you have forgotten something about the hose.

 

[RMalayappan]

Evidently I have forgotten something, but I don't know what it is. I'm not exactly sure what is different between flow out of an orifice and a tube.