SWCC-Riyadh, appointed “ARE”, for the assessment of the Million and Jurranah reservoirs in Makkah region. The scope included investigation and assessment of the concrete structural elements, cable stayed roof and earthen dams. The work involved carrying analyses and simulation to examine if the detected seepage (if any) is within safe ranges and in controlled pattern, evaluation of the existing piezometers data and define the level of risk and at which piezometers level reservoir have to be emptied/filled, and at what piezometers rising rate at which the reservoirs have to be emptied. Also includes evaluation of the safety of reservoirs slopes and base from different aspects such as slope stability, allowable bearing capacity, seepage (leak), erosions aspects as well as other aspects; Hydraulic and geotechnical stability of the closure dam and abutments, etc. Works involved visual inspection, sampling and testing, and assessment & recommendations.
Based on the assessment, ARE shall produce a Remedial Works Package to be carried out by a specialist Contractor (s) including; Scope of Works; Tender Drawings; Bills of Quantities; Performance Specification for the monitoring scheme; and Specification for any addition rehabilitation or remedial works.