Hello PhilCorso,Jeffrey...
1) Are the 2 output orifices at the same level from the surface of the water?
2) Are the 2 output orifices the same size?
3) Are the 2 output orifices very small with respect to the volume of water in the tank?
4) Is there water flowing into the tank?
As long as the answer to Q3 is yes, then use Bernoulli's Theorem!
Regards, Phil Corso