The Strategic Tunnel Enhancement Programme (Step) is a deep-gravity sewerage system designed to collect wastewater flow of 1.9 million cubic metres a day from Abu Dhabi island and the mainland.
STEP (STRATEGIC TUNNEL ENHANCEMENT PROJECT)

The Strategic Tunnel Enhancement Programme (Step) is a deep-gravity sewerage system designed to collect wastewater flow of 1.9 million cubic metres a day from Abu Dhabi island and the mainland.