We are at the tail end of our pool construction. We have a gunite pool and raised spa. The pool and the spa each have their own pool equipment/filter set up so that we can winterize the pool and keep the spa open. We have recently had a lot of rain in the area. The pool has an overflow set up, so the water stays at a normal level. However, we recently learned the spa does not have an overflow set up. Recent rain put the water level at the top of the spa and it does not go down. We asked our pool builder about the spa overflow and he said their isn't one. They said "a cover will solve this". We were not planning to use a cover during the summer so we can enjoy the lights and aesthetics of the spa and pool. Is no overflow for the spa normal, or did our pool builder make a mistake? Any suggestions or remedies?