Flow of anti- ood measures

The Stamford Diversion Canal and the Stamford Detention Tank will reduce the load of Stamford Canal – which over owed in the 2010 and 2011 oods – by 30 per cent

STAMFORD DETENTION TANK How excess stormwater enters and exits the Stamford Detention Tank ROAD • 38,000 cubic m storage capacity, or 15 Olympic-sized swimming pools Water ows by • Excess stormwater in the drains of Holland Road will over ow into the 2 During heavy rain, gates allow 3 detention tank for temporary storage. The water will later be discharged into excess stormwater to over ow gravity into TYERSALL Stamford Detention Inlet & the Stamford Diversion Canal once sensors detect that water levels in the into weir chamber outlet Botanic Holland Road, Napier Road and Grange Road drains have fallen to a low level Tank via twin inlet pipes Gardens pipes CLUNY ROAD 1 Stormwater HOLLAND ROAD ows into NASSIM ROAD Holland Road

HILL drain

CLAYMORE EXPRESSWAY

SCOTTSROAD Lucky Plaza Overflow weir Orchard CENTRAL CUSCADEN station chamber ROAD Stamford Canal ROAD Ion Orchard Wisma ORCHARD Atria BOULEVARD PATERSON HILL STAMFORD DIVERSION CANAL GRANGE ROAD • It will divert rain water from 240ha Somerset station of the total 630ha catchment area station into the station • The 2km canal runs from Tanglin RIVER VALLEY ROAD Fort Road to Grange Road, across to Hoot Canning STAMFORD ROAD Stamford KIM SENG Park Canal Kiam Road, off Kim Seng Road and to ROAD ends at the Singapore River Singapore Marina 4 The canal is one of the shallowest River Reservoir • HILL STREET Excess stormwater is large-diameter tunnels in Singapore, City Hall When water level in the drains in temporarily stored in the station 5 with some areas 4m under ground Holland Road and Napier Road falls, water tank (38,000 cubic m in the Stamford Detention Tank is pumped storage volume) Marina Reservoir back into the drainage network Source: PUB STRAITS TIMES GRAPHICS