This table shows the approximate amount of water different types of landscaping typically need each month. Individual watering times may vary due to soil and other conditions. Gradually reduce the amount of water you're using to find an adequate amount for your situation without being wasteful. Use this guide as a reminder to change your sprinkler system each month. When there's measurable rain, turn your sprinkler system off and keep it off until the ground has dried. Download the Irrigation Guide (PDF).