Does your lawn sit on a hill or slope? If so, when watering your lawn this is something to be mindful of. When you’re watering your lawn, if the soil is compacted or has a thatch issue the water is going to run down the hill or slope. Meaning less water is being absorbed and the root system is unable to thrive. Resulting in thin unhealthy grass. To avoid this you will want to consider breaking up your irrigation run times and watering in sections. Most irrigation systems have the option to run zones for different amounts of time.