PULAU INDAH, INDUSTRIAL PARK, Malaysia Client: Central Spectrum (M) Sdn Bhd Country: Malaysia Length of Pipe: 5 km No. of Valves: 100 Peak Flow: 30 litres/second Specialist Feature: Reduced sewer depths through innovative design to negoti- ate the deep storm water drains Pulau Indah is an island off the coast of Malaysia, South -west of the capital city Kuala Lumpur. The ground conditions on the island are mangrove swamp overlain with fine sand and a water table approximately 1 metre below the existing ground levels. With storm water drains installed at depths of up to 3 metres, the previously designed gravity system had main sewers 5 metres deep and 4 pumping stations each at a depth of 10 metres from the finished ground levels. With the existing soil conditions, the diffi

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