Lawn sprinkler systems can improve your lawn's health, but you can do serious damage without learning how to properly use an automated system. Without enough water, grass will become crunchy, or blades will wilt. You'll notice that the ground is dry and the grass breaks when stepped on rather than springing back to life. A lack of water can also cause your grass to grow less quickly. Overwatering can lead to Brown Patch Lawn Disease. You'll notice that some grass areas develop brown due to turf fungus growth. When shady areas get too much water, you might notice moss growing. Shady areas are also more likely to suffer from root rot and rotting grass, which will turn your lawn yellow or brown.