Background

The Kingdom of Tonga comprises around 170 islands in the Pacific, 36 of which are inhabited. Three quarters of the population lives on the main island of Tongatapu, with almost all the rest distributed among the island groups of Vava'u, Ha'apai and 'Eua. For the existing road network, the ongoing erosion was increasingly a problem. Both road surfaces and the corresponding drainage infrastructure were repeatedly damaged.

Project

The Ministry of Infrastructure of the Kingdom of Tonga commissioned GAUFF Engineering, in cooperation with IMC (now DT Global, UK), to elaborate a feasibility study, detailed technical planning, tender evaluation and construction supervision of road works on Tongatapu and the island groups of Vava'u, Ha'apai and 'Eua. The road sections that had to be planned had a total length of about 155 kilometres. The focus was on the development of technical specifications for the improvement of road surfaces and drainage, especially on road sections prone to erosion. Subsequently, GAUFF Engineering together with IMC provided construction supervision for selected roads with a total length of about 110 kilometres.

Services

Updating and development of technical specifications

Feasibility study

Risk management

Detailed technical planning with focus on material use and drainage

Construction supervision

Technical training of the client to enable them to undertake the work themselves

Development of a performance-based maintenance contract with monitoring of maintenance in the first year