@RVRoadie, I think you’re referring to the square footage the zone, correct?
If so, this measurement is taken into account in your precip rate. Currently, this calculation is a manual input. We hope to enhance this feature in the future to make it easier to configure and remove the math involved.
Nevertheless, do you need any help calculating your precip rates? If so, please refer to this support article with the equation to do so. Let us know if you have any questions.