Sure @Linn. @beaker353, are you fairly confident of your soil setting? That’s an important starting point. We have Sandy Loam here. I’m currently watering my shrubs every 5 or 6 days (my crop coefficient is 0.52.) and am giving each shrub 8 gallons (1GPH emitters, 1 per shrub, 8 hour runs). That’s the recommended watering duration for a 3ft canopy shrub here in Phoenix, and also the recommended interval for this time if year.
We got up to 118F here last Sunday and are due to hit 122F in Phoenix tomorrow. With these temps I’ve been checking my shrubs and garden daily. At day 6 one of my many shrubs was showing signs of distress, but the others seem just fine. That was at a crop coefficient of 0.5, so I bumped it up to 0.52 to water at 5 days instead of 6. 75% sounds quite high to me, so I’m guessing you expect more frequent watering?
Screen shots of your zone and schedule would be helpful. Also share your nozzle precipitation rate and your moisture graph with details shown. We should be able to help. There are at least four of us on these boards that are active and can try to point you in the right direction.