In a healthy redwood grove, fallen trees and beaver dams help spread rainfall out across the forest floor, allowing the ground to slowly absorb it over time. At Roy’s Redwoods, a beloved public forest preserve in Marin County, California, visitors had created so many informal trails across the forest floor that the nearby creek began following the footpaths and incising the ground, creating rapid runoff that couldn’t easily infiltrate the soil and nurture the trees and understory species. “There wasn’t a clear trail system, and the community was just walking wherever,” says Lauren Hammack, a fluvial geomorphologist and principal at Prunuske Chatham, Inc.
Hammack and landscape architects at the Restoration Design Group recently worked to redirect both public access and water flow within the preserve. Erik Stromberg, a principal with…