Our weekend rains didn’t go down the drain in Roanoke’s recently-renovated Elmwood Park. Part of the project included a system to gather and store rainfall, water to irrigate the park’s landscaping — all 20,000 plants. It is part of a greater city effort to reduce the amount of rainfall runoff that picks up pollutants before flowing into storm sewers and eventually into the Roanoke River. WFIR’s Evan Jones has the story…