In watershed and land-use planning, the buffer zone serves primarily to achieve which outcome?

• A. To protect water quality and habitat by filtering runoff and reducing erosion
• B. Provide recreational open space
• C. Increase property values around the watershed
• D. Block all wildlife movement

Answer: (A)

The main idea behind buffer zones in watershed planning is to protect water quality and habitat by filtering runoff and reducing erosion. Vegetation in these strips acts like a sponge, slowing stormwater, trapping sediments, and absorbing nutrients and pollutants before they reach streams or rivers. The roots stabilize stream banks and support riparian habitats, helping maintain ecological health along the waterway. While a buffer can offer some recreational open space or affect property values as a side effect, its primary purpose is not recreation or economics. Blocking wildlife movement would undermine habitat protection, so buffer zones are designed to support, not hinder, ecological connectivity.