Shouldn’t all irrigated lawns be green? Yes and no. Take the pictures above. The picture on the left shows the entire lawn, and the picture on the right is a small section of the same lawn. This is typical of almost all lawns, especially those with established trees.
In a perfect world, irrigation would ensure a uniformly green lawn. However, different parts of a lawn have varying soil profiles and water requirements. Factors such as buried gravel, tree roots, slopes, and varying sun exposure can create wet and dry spots despite using the same irrigation program. Adjusting sprinklers can help, but some variation is often unavoidable.
Historically, we watered more to compensate for those hard to water areas. With increasing water costs, we've aimed to reduce irrigation to save money for our customers. The downside is that most properties end up with a few dry spots. The upside is that tolerating these dry spots can cut water costs by 20-40%. This is where weather-based irrigation systems come in. They adjust the watering schedule daily based on current weather conditions. However, factors like inconsistent soil, hidden debris, and gravel can still create differential water needs and challenges in certain areas, regardless of irrigation method.
Weather-based irrigation is excellent for reducing water usage but also highlights areas where the landscape or irrigation system may need improvement. You can read more about it here.
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