A bio-what? Bioswale are open channels with vegetation, intended to move water, say runoff water from a parking lot or driveway or roadway, slowing, cleansing and filtering it along the way.
Volunteers worked on installing a Native Garden at Redwood Grove on Dec. 10.
GreenTown and Acterra invited the public to participate in the installation of a bioswale, permeable pathway, and native garden, in what is Phase Two of the Rainwater Harvesting and Native Gardens Demonstration Project, a joint effort of GreenTown Los Altos, Acterra and the Los Altos History Museum Shaped by Water exhibit.
To learn more about bioswales, see this nicely illustrated page on rainwater management from the website from the Capital Regional District of Vancouver island in British Columbia.