The project includes preparation of engineering and economic studies to achieve the objectives of the National Water Company, raise the level of customer service, and develop the scope of work through the preparation of databases and programs to manage work between the National Water Company, customers and contractors, coordination between other government sectors, and the development of engineering plans to raise the level of quality in projects, the preparation of studies and the offering of contracts for contractors to implement projects of sewage lines and sewage connections to the eastern regions of Riyadh. The project includes implementation of horizontal drilling works with large depths and diameters. Many sewage projects and household connections have been executed, designs approved and studies prepared for that. The total length of the lines is 438 km with different diameters and types, and the number of connections is more than 16,000 connection and a set of lifting stations