To measure the effectiveness of water-saving irrigation methods on your lawn, consider monitoring factors such as water consumption, soil moisture levels, and plant health. Install water meters or flow sensors to track water usage, and use soil moisture sensors to monitor soil moisture levels. Regularly inspect your lawn for signs of healthy plant growth, such as vibrant color, dense foliage, and minimal weed growth. By tracking these metrics, you can determine the effectiveness of your water-saving irrigation methods and make adjustments as needed.