thatch thickness and soil composition really can determine whether your water will penetrate the roots of your lawn or simply run off or evaporate without doing much good. Thatch can create a vicious cycle: More than a half inch of thatch will thicken from over watering while keeping water from reaching healthy grass roots during critical growing seasons.
The best way to break down thatch is to aerate and or pawer rake. We have been doing this for over 11 years now. utah lawn aeration