A parcel tax, if approved by voters sometime next year, would fund projects to capture more rain and percolate it underground so it can be used to augment drinking water supplies. Last winter was the second wettest winter in California history. But only a fraction of the rain that fell in Los Angeles County is captured to percolate into the ground and recharge aquifers. County Public Works projects capture enough rain water to serve the annual needs 1.5 million residents, but with the right projects, officials think they could double or triple that amount.