Bernoulli's Principle and Water Tank

[663697]

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Referring to the image below, the practice questions I've done so far have assumed that P1 = P2 in the Bernoulli equation in order to solve for the exit speed of the fluid at the bottom of the tank. The TPR book states this is because Patm is the same at the top and bottom. However, wouldn't the pressure at the bottom also include the gauge pressure from the water above that specific point? This is what is confusing me with these questions as I have never covered it in my ugrad courses.

 

[Neuroplasticity]

Bernoulli's uses compares 3 different kinds of pressures: static (pressure term), dynamic (velocity term), and the hydraulic head (height term). The static pressure on the fluid at point 1 is Patm, and the static pressure on the fluid at point 2 is Patm. The difference in height in taken into account by the p*g*h term in Bernoulli, the hydraulic head.