How should surface stormwater drainage be managed according to CALGreen?

Managing surface stormwater drainage effectively is essential for environmental sustainability and meeting regulatory standards, as set forth in CALGreen. Proper grading and drainage systems play a pivotal role in diverting and controlling stormwater runoff. This method ensures that water is directed away from structures and into designated drainage areas, minimizing the risk of flooding and erosion.

Grading involves designing the land's slope to facilitate natural water flow, while drainage systems include the use of pipes, trenches, or channels that transport stormwater efficiently to prevent pooling and manage runoff volume. This approach not only addresses immediate drainage needs but also reduces the potential impact on local water bodies by filtering pollutants and allowing for natural filtration processes.

Other methods, such as decorative landscaping, may enhance aesthetic appeal but do not provide the necessary functional drainage capabilities. Artificial water retention pools can manage stormwater; however, without proper grading and drainage design, they may not be effective in all scenarios. The use of chemical drainage aids is generally discouraged due to potential environmental impacts and risks associated with chemical runoff. Thus, focusing on grading and drainage systems is the most reliable and environmentally friendly approach to managing stormwater effectively.