Venturi

Ok I have received a project from my engineering class at

school and need some help.

Here it is: Please excuse the elementary task!!

Problem: I have to combine 2 liquids by using an injection type method.

The main component is H20 the other to be injected into the line of H20 is Syrup "Viscosity similar to H20".

I have to achieve a constant "set" flow rate of the syrup into the main line of water 

when the water is flowing.