Civil Engineering June 2022 | Vol 30 No 5

upgrade old delivery pipework, the old 400 kW pumps had to be taken offline for a prolonged period. This neces- sitated the construction of a flow and pressure-controlled cross feed from one rising main to the other to maintain the supply to the affected area. The new electrical building houses new medium voltage switchgear, transformers and an MCC room. The old electrical building was demolished to make way for a new generator building to house the two existing and two new diesel-powered generators. HIGHBURY WTW Due to funding constraints, the civil works for the new greenfields Highbury WTW had to be split into two stages. Construction of the first stage began in 2019. The contract for the remainder of the civil infrastructure is about to be awarded and tendering for the mechanical Figure 8 Raw water emergency river pumps with new Clear Water pump delivery manifolds in background Figure 7 New 4 000 kVA generator building for Thornhill WTW Figure 6 New MCC room for Thornhill WTW pumps Civil Engineering  June 2022 17