 The Four National Taps form the backbone of PUB's, and in turn Singapore's, water management strategy.Singapore's rainwater is collected and stored in 17 reservoirs using an extensive network of drains, rivers and canals.The 17 reservoirs for rainwater collection are Pandan Reservoir, Kranji Reservoir, Jurong Lake, MacRitchie Reservoir, Upper Peirce Reservoir, Lower Peirce Reservoir, Bedok Reservoir, Upper Seletar Reservoir , Lower Seletar Reservoir, Poyan Reservoir, Murai Reservoir, Tengeh Reservoir, Sarimbun Reservoir, Pulau Tekong Reservoir, Marina Reservoir, Serangoon Reservoir and Punggol Reservoir.