NADI-LAUTOKA REGIONAL WATER SUPPLY SCHEME, FIJI
44-NADI-LAUTOKA-REGIONAL-WATER-SUPPLY-SCHEME,-FIJI.pdf - 161.6 KB
Contract Value
$70 MILLION
Construction Period
MARCH 1980 - APRIL 1983
Client
MINISTRY OF WORKS, FIJI
This project for a complete water supply scheme servicing Fijis Nadi-Lautoka region, was constructed by Baulderstone in joint venture with Thiess and Leightons.
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This project for a complete water supply scheme servicing Fiji’s Nadi-Lautoka region, was constructed by Baulderstone in joint venture with Thiess and Leightons. The facility services a population of 80,000 with capacity built in to cater for an anticipated population of 187,000 by the year 2001.
The scope of work included an earth and rockfill dam with a clay core located at the headwaters of the Nadi River in the Nausori Highlands. The rock fill and filter material for the dam was won from the 230 metre long spillway cut. The project also included construction of a 44ml/day treatment works, a total of 64 kilometres of ductile iron pipeline and a 13 kilometre road through difficult terrain to provide access for construction and maintenance of the pipeline. The dam sits 500 metres above sea level with the treatment works at 170 metres.
The reservoirs fed by the treatment plant are all at elevations less than 100 metres. Four break pressure tanks are provided between the dam and the treatment works with the first of these incorporating hydro-electric generation plant to power the control tower and dam area.
The treatment plant, located at Nagoda some 17 kilometres from the dam, incorporates chemical dosing, settlement and rapid gravity filtration, chlorination and fluoridation.
The early completion of the project was a particularly notable achievement due to exceptionally we conditions throughout the contract period. Cyclone Arthur in January 1981 and Cyclone Hettie in January 1982 both caused delays to the project with the work affected by rain itself, subsequent landslides and consequent bridge failures which disrupted access to the dam site, in one case for around six weeks.
