Rainwater treatment at the wastewater treatment plant without overloading the combined sewer system
The INKA-controlled road drainage system allows contaminated rainwater to be safely routed to the wastewater treatment plant, while uncontaminated rainwater is routed directly to the separate system/watercourse. The first rainwater that washes off the First-Flush is collected in a storage pipe under the road and retained until the combined sewer system has the hydraulic capacity to safely discharge the volumes to the wastewater treatment plant.