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Brief
 
 In realizing its vision and through its services and projects and strategic planning, ADSSC look to participate in developing the sewage Sustainable development in sewage sector in Abu Dhabi and actively participate   infrastruc​ture development through a comprehensible strategic plan conducted by Abu Dhabi Government.

In this context, STEP is considered to be a cornerstone on the Abu Dhabi government's map of pipeline infrastructure projects. This project will accommodate the projected demands in the emirate for flow and distribution management from the island and mainland and some of the neighboring islands through cooperation with partners and related entities in the emirate.

This project is enlisted as part of the company's strategy for the 5 years plan incorporating the General Policy Agenda of Abu Dhabi municipality and according to the the strategic plan of 2030 projecting his R.H Sheikh Khalifa Ben Zayed Al Nahyan, vision (in God's bless) which engulfs the continuity of secure social and economic development open to international compatibility.
 
 The tunnel is considered to be of the longest descending waste tunnels in the world. The program main components consists of three main elements:
 
• 41 kilometers (km) deep sewer tunnel (the “spine”)
 
• 43 km of smaller diameter link sewers (the “ribs”) to transport the waste water to the treatment plants.
 
• A main pumping station with maximum capacity situated at the end of the deep tunnel. The link sewers will relieve the existing main  collector system and eliminate the need of up to 35 existing pumping stations, which are nearing capacity and require extensive  maintenance.
 
The flows will be channeled by gravity via the deep tunnel sewer to the main pumping station, and then lifted to centralized wastewater  treatment facilities. The treated sewage effluent (TSE) will return to the metropolitan area for irrigation purposes.
This program is one of the unique solutions that carry an effective and qualitative value in terms of cos, sustainability, meeting the long term island demands, mainland and neighboring archipelagos of water waste and treatment.

This program will provide a successful system with ecological benefits of waste