What is a potential method for addressing surface stormwater drainage mentioned in CALGreen?

Using swales is a recognized method for managing surface stormwater drainage as outlined in CALGreen. Swales are shallow, vegetated channels designed to slow down and filter stormwater runoff. They facilitate natural infiltration into the ground, which reduces surface water runoff and helps recharge groundwater supplies. The vegetation in swales also provides increased water quality benefits by filtering pollutants from stormwater before it enters larger water bodies.

Swales can effectively manage stormwater in various settings, including residential, commercial, and industrial areas, making them a versatile and sustainable solution. Their design allows for the landscaping to blend with the natural environment, promoting aesthetic value and ecological benefits.

In contrast, other options like installing rainwater barrels, while useful for capturing roof runoff for later use, do not address broader surface drainage issues effectively on their own. Building artificial lakes and excavating underground tunnels are more extensive and costly solutions that may not be practical for all situations, especially when simple surface solutions like swales can be employed more efficiently.