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ilf consulting engineers water supply waste water mdf eib man made river project brown & root ghadames project kfw bank gravity pipelines sewage pipelines pe pipelines testing rc tank libya bat iii project lanchkhuti georgia waste water project existing conditions water reservoirs derventa sanitation al jewaibyah regulating rc tank water tanks rc tanks gharyan tank construction joints water-stop pipe penetrations prefabricated manholes serbia etno-architecture etno village stanisic ozurgeti reservoir lashis gele pipeline minor structures pipelaying pccp pipe man made river kostajnica water supply project kfw bore piles piling anti-sliding piles helical reinforcement helical pile's reinforcement cages pile's concrete sewage pump stations waste water pumping station gravity collectors sewage collectors pressure pipelines ww manholes ww air valves steel pipelines grp pipelines trench bracing trench shoring sheet piling kakanj city water stop reservoirs tie-rod formwork rehabilitation of lashis-gele water rc reservoir rehabilitation of oragvis-gele water rc reservoir water supply pipelines channel crossing 3-days construction schedule tightness testing en1610 handbook en805 hydrostatic pressure testing hydrostatic testing batumi water supply tanks seismic bore piles batumi project