The Mengkuang Dam is the core component of the “Mengkuang Pumped Water Storage Scheme”. The “pumped storage” aspect differentiates the Mengkuang Dam from the other key dams in Penang. During dry seasons, the raw water stored in the Mengkuang Dam is released when the levels of Sungai Muda (at Penang’s Lahar Tiang Intake) is low.
Water released from this dam during dry seasons is channelled, via Sungai Dua Canal at Lahar Yooi, to the Sungai Dua Water Treatment Plant (WTP).
On 14.12.1985, the Yang DiPertua Negeri (Governor) of Penang, TYT Tun Datuk Dr. Haji Awang bin Hassan, officially opened the “original” Mengkuang Dam.
The Mengkuang Dam has been expanded to meet Penang’s water supply needs during annual dry seasons in the 21st Century. On 15.11.2020, Penang Chief Minister YAB Tuan Chow Kon Yeow officially opened the Mengkuang Dam Expansion Project (MDEP). Today, the maximum effective capacity of the dam is 86.40 billion litres.