You could probably come up with something figuring the surface area of a drip hole and the vecosity of water and the surface tension of water and multiply it by the number of holes....
But if it were me I would just connect it up and see if it works. If the drip plate can't keep up with the flow.... drill more holes, it is just acrylic. Just make sure the drip plat is fully supported while drilling by putting it on a piece of wood... to prevent cracking the acrylic.