Drainage involves the natural flow of surface water across the property. Many factors affect drainage, including the topography of the property and the land upstream, the type of soil present, the type of development on the property (for example, whether the property is paved or landscaped), the localized drainage systems at the property (drains, gutters, ditches, and the like), among many others. Some properties may naturally be prone to flooding during heavy rain events. Adequate drainage is also important to hillside stability and landslide prevention.
To evaluate the adequacy of the drainage systems at your property, and to determine whether your property presents special risks (such as hillside properties), you should consult a California licensed specialist, such as a civil engineer, geotechnical engineer, or geologist, and obtain guidance on the need for regular slope and drainage inspections.