The answer to 'drainage system brown patches' is that they are typically caused by issues with the drainage system, such as clogged or damaged pipes, poor grading, or inadequate drainage. Symptoms can include standing water, soggy soil, and unsightly brown or dead patches of grass. To address this, you'll need to inspect and repair the drainage system, which may involve unclogging pipes, regrading the soil, or installing additional drainage components.
In many cases, homeowners can handle minor drainage issues through DIY methods like snaking pipes or improving grading. However, for more complex problems or if the issue persists, it's best to call in a professional landscaper or drainage specialist. They can properly diagnose the problem and implement a comprehensive solution to ensure proper drainage and a healthy lawn.