gallons per 1 inch of rainfall
gallons per 1 inch of rainfall
20th St. Overlook 1st Ave and 20th St. Rock Island, IL Project Area 140′ x 15′ Square Footage 2,100
Sylvan Slough Natural Area 4th Ave. and 45th St. Rock Island, IL Project Area 360′ x 450′ Square Footage 162,000