Along the Los Gatos Creek Trail in Los Gatos, Campbell and San Jose, there’s an 80 acre park called the Los Gatos Creek County Park.  This long park includes six percolation ponds, which look a bit like square or rectangular ponds with gravel along the edges.  I passed by one yesterday in Campbell along Budd Avenue near San Tomas Expressway.  It was a pretty sight with the Santa Cruz Mountains in the background.  (This view is looking south toward Los Gatos and toward Santa Cruz and the Monterey Bay beyond the coastal foothills.)

Perhaps you have seen them and wondered what their purpose is?  The series of ponds and waterways enables the rainwater runoff to be filtered and placed back into the underground waterway system, which we refer to as aquifers.  (The Unites States has a number of very large aquifers throughout the country, and the biggest one in California is the Central Valley Aquifer.)
(more…)