Indianapolis averages 42 inches of precipitation annually, with heavy rainfall concentrated in spring and early summer. Storm events frequently exceed one inch per hour, overwhelming storm sewer systems designed for slower drainage rates. Clay soil throughout Marion County has low permeability, meaning surface water cannot infiltrate naturally. Your parking lot drains carry the entire runoff load. Catch basins designed for moderate flow rates in sandy soils fail rapidly when installed in clay. Sediment from erosion during construction phases settles into catch basins and hardens during dry months, reducing capacity by 40 to 60 percent within two years of installation. Regular stormwater drain cleaning prevents this capacity loss.
Marion County stormwater regulations require commercial properties to maintain functional drainage systems that do not discharge sediment-laden water into municipal storm sewers. Inspectors enforce these requirements during site plan reviews and complaint-driven inspections. Properties with visible ponding or sediment discharge face mandatory corrective actions. Keystone Plumbing Indianapolis has worked with local inspectors and understands what documentation and system performance they expect. We provide service records that satisfy compliance audits and demonstrate good-faith maintenance efforts. Choosing a contractor familiar with local enforcement standards reduces your regulatory risk.