Many irrigation systems have different sprinkler head types. This is because some plants work best with a drip or spray system and your grassy area might benefit more from a rotor sprinkler head. But professional installers will clearly delineate these areas clearly. A mixed zone is where the same patch of vegetation is watered by two or more types of sprinkler heads. These zones can occur even if your sprinklers are evenly spread out because different types have different reach lengths.
What problems can mixed zones cause?
Sections of your landscaping will be overwatered.
Plants only need so much water before their roots start to drown and their leaves wilt or start to yellow. Overwatering can also turn the surrounding soil into mud and leave puddles of standing water. This will dissuade customers from walking nearby, especially if the mud starts to stretch onto the sidewalk. Commercial landscaping is supposed to entice passing traffic and give your commercial tenants a competitive advantage. If the landscaping is routinely muddy and drooping, they might look elsewhere.
Water is expensive.
Irrigation is routinely one of the most expensive maintenance costs for real estate, and even an irrigation system with a timer and environmentally-friendly settings might not change that. If you’re overwatering parts of your landscaping, you still have to pay for the wasted water that’s drowning some of the plants. Doubling the coverage for large sections of plants and grass means you could routinely be paying for ten or twenty percent more water than you need. If you water more than city ordinances allow because of a drought in the area, then that water could also come with surplus fees or penalties.