Al-Mukallah Water Supply System (First Stage)

Project Description

Phase 1: Pre-construction Services:

Review and approve tender documents for the supply and delivery of water well casings and screens.
Review and approve tender documents for drilling and testing of boreholes.
Review and approve tender documents for construction of pump stations, reservoirs and pipelines.
Contractor’s prequalification procedures and preparation of prequalification list.
Assist NWSA in tender evaluation and award of contracts.

Phase 2: Construction Supervision Services:
Provide complete construction supervision services including: review and approval of contractor’s furnisheddesigns and drawings; continuous site supervision of construction and electromechanical installations, and outside inspection in suppliers factories.
Phase 3: Technical Assistance:
Provide NWSA with technical assistance services during construction of the project, on-the-job and overseas (Egypt) training.

The objective of the project was to increase water production to meet the actual demand required for Al-Mukalla. Water was conveyed to Al-Mukalla from the existing Wadi Buwaysh wells producing 40 l/sec and the new An-Naga’ah wellfi eld which adds 138 l/ sec.
The project comprised the development of a new wellfield at An-Naga’ah by drilling twelve boreholes equipped with wellscreens and borehole electrosubmersible pumps. Water was conveyed through a 400 mm pipeline to a 400 m³ collection tank. At Wadi Buwaysh additional three boreholes were drilled and developed to replace existing wells. Water from the collection tank at An- Naga’ah was conveyed through a 600 mm pipeline to Al-Sedad by means of a new 800 m³ reservoir at Al Huwayrah. From
Al-Sedad reservoir a 400 mm pipeline was laid around Al-Mukalla to Bagrain and Al-Omal areas. Booster pump stations were built at Wadi Buwaysh. Moreover, two reservoirs were built at Al-Sedad (1,200 m³) and at Al-Omal (2,000 m³).