1 Average number of days with more than 70mm of rain in one hour Year 2012 Year 1980 1980 2012 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 165 Ongoing 105 Completed in 2012 & 2013 32 Commencing in 2014 Sungei Mandai Kechil Sungei China Kranji Reservoir Sembawang Outlet Drain No.2 Sungei Sungei Sembawang Punggol Tekong Mandai Serangoon Upper Sungei Khatib Bongsu Reservoir Reservoir Reservoir Sarimbun Sungei Buloh Besar Seletar Murai Reservoir Reservoir Reservoir Pang Sua Diversion Sungei Kangkar Sungei Pang Sua Lower Sungei Seletar Sungei Seletar Reservoir Punggol Canal Sungei Sungei Sungei Serangoon Lower Sungei Sungei Sungei Tengah Tongkang Peng Siang Sungei Changi Peirce Blukar Poyan Simpang Kiri Reservoir Reservoir Sungei Seletar Sungei Api Api Sungei Loyang Jurong Sungei Tampines Canal Upper Peirce Kallang River Sungei MacRitchie Sungei Selerang Reservoir Sungei Pinang Tengeh Lanchar Reservoir Bedok Bedok 5th Reservoir Jurong Reservoir Subsidiary Drain Lake Bukit Timah 2nd Bukit Timah Canal Diversion Canal Sungei Ulu Bedok Canal Pandan Pelton Canal Siglap Canal Jurong Industrial Jurong Industrial Estate Outlet Drain Sungei Whampoa Sungei Sungei Ketapang Changi Collector Stamford Drain 1 (South) Pandan Canal Diversion Canal Ulu Pandan Rochor Changi Airport Pandan Canal Canal Sungei Jurong Reservoir Alexandra Canal Geylang River Bukit Timah 1st Singapore Marina Diversion Canal River Reservoir 16 17 Western Watershed 18 19 20 21 Central Watershed 22 23 Newton Farrer Road Road Stevens Stamford Road Scotts Detention Tank Road Holland Road Orchard Road Napier Roa d Selegie Stamford Road Grange Diversion Canal Road Alexandra Canal Singapore River Ayer Rajah Alexandra Road Expressway Lower Delta Road 24 25 26 27 Eastern Watershed 29 Tampines Avenue 10 Tampines Tampines Bartley Road East Avenue 3 Avenue 2 Bartley Viaduct Simei Street 4 Bedok Reservoir Simei Avenue Bedok North Bedok Expo Drive Road Reservoir Road Bedok Canal Bedok Road Bedok North Upper Xilin Avenue Avenue 1 Changi Road East Upper East New Upper Changi Coast Road Road Sea Bartley Road East Jalan Damai Pan Island Expressway Kaki Bukit Avenue 1 Eunos Jalan Crescent Kembangan Changi Road Siglap Telok Kurau Road Road Frankel Joo Chiat Place Avenue Siglap Still Road Canal East Coast Road Marine East Coast Parade Parkway Road Sea 30 31 32 33 34 35 36 37 Major Canals and Outlet Drains Roadside Drains Estate Upgrading Programme 38 39 40 41 Major Canals and Outlet Drains 42 43 44.