Haya Water’s two major sea outfall projects to be ready by year-end

Muscat: Around 85 per cent of the two sea outfall projects in Darsait and Al Athaiba has been achieved and the project is expected to be completed by end of current year, Haya Water said in a press statement.
The company said that the two sea outfall projects will greatly help to discharge mixed raw sewage and storm water during storm and cyclones.
The Darsait Sewage Treatment building coincides with the establisment of the two outfall projects in Darsait and Al Athaiba. This project is considered to be of significance because it discharges surplus of treated effluent (TE).
Technicas Reunidas and Sarooj Construction Company joint venture was appointed by Haya water to execute detailed design and construction works in August, 2014.
The main objective of both projects is to ensure that the discharges cause no environmental degradation of the coastal region and that the outfalls will provide a future-proof solution, avoiding adverse impact on beaches and at a nearby desalination plant. The company successfully completed last year the construction Al Seeb outfall.
In 2010, Haya Water appointed Halcrow to carry out feasibility studies and develop designs for emergency marine outfall at two prime locations, from Darsait Sewage Treatment Plant (STP), the third largest STP in Muscat, and from Al Athaiba Central PumpingStation (CPS) which pumps all the collected sewage from Bausher catchment into Al Ansab STP, the second largest STP in Muscat.
The Darsait Sewage Treatment building coincides with the establishing of the two outfall in Darsait and Al Athaiba. This project is considered to be one of a significant importance because it discharges surplus of Treated Effluent (TE). Both projects will greatly help to discharge mixed raw sewage and storm water during storm and cyclone events.
Although, networks are dedicated for transporting sewage storm and rainwater may enter these networks via sewage manholes that are designed to handle limited amount of storm flow.
A comprehensive series of surveys and investigations have been conducted together with detailed design work including 2D and 3D hydrodynamic dispersion modelling, environmental impact assessment (EIA), hydraulic, surge and structural analysis. The proposed outfalls are 1600mm dia High Density Polyethylene (HDPE), extending up to 3,100m long in water depths up to 22m in Al Athaiba and 2,500m long in water depth up to 45m in Darsait.