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Stamford Diversion Canal and Stamford Detention Tank Go Operational Diversion Canal and Stamford Detention Tank Go Operational27/9/2018 4:00:00 PM28/9/2018 4:00:00 AMIssue DatePress Release About PUB, Singapore’s National Water AgencyFind out more about us<p>Pedestrians walking around Grange Road and River Valley Road might not know that a 2km diversion canal has been dug underfoot to channel stormwater into Singapore River. Similarly, visitors alighting at Singapore Botanic Gardens coach park might not know that a mega detention tank is located right beneath them. These major drainage projects - Stamford Diversion Canal (SDC) and Stamford Detention Tank (SDT) – which are designed to better protect Orchard Road against floods, have been completed and will go operational this month. </p><p>Mr Masagos Zulkifli, Minister for the Environment and Water Resources, officiated the commissioning of the SDC and SDT this morning. </p><p><img src="" alt="" style="margin:5px;" /><br></p><p><img src="" alt="" style="margin:5px;" /><br></p><p><strong>Enhancing Flood Protection for Stamford Catchment</strong></p><p>Intense rains in 2010 and 2011 had caused floods in Orchard Road as the Stamford Canal, which stretches 4.7km under Orchard Road shopping belt from Tanglin to Marina Reservoir, could not cope with the heavy rain then. PUB had since implemented several measures to improve stormwater flow and reduce flood risk for the Orchard Road area. These measures included raising the road from Orange Grove Road to Cairnhill Road by an average of 30cm, introducing a lining to smoothen the walls of Stamford Canal to channel stormwater more quickly and working with building owners along Orchard Road (e.g. Lucky Plaza, Wisma Atria) to install flood protection measures such as flood barriers.</p><p>In addition, the SDC and SDT were identified as important, long-term measures to alleviate floods in the Orchard Road belt. Construction works for SDT and SDC commenced in 2013 and 2014 respectively. (Please refer to <a href="">Annex A </a>for infographic on flood protection measures for Orchard Road).</p><font color="#000000" face="Times New Roman"> </font><p style="text-decoration:underline;">Stamford Diversion Canal (SDC)</p><p>The 2km SDC runs underneath Tanglin Road to Grange Road, across to Hoot Kiam Road, off Kim Seng Road and to the Singapore River. The SDC will divert stormwater from the upstream of Stamford Catchment (such as Holland Road and Napier Road areas) into the Singapore River, through two underground tunnels of 4.5m diameter and drains (6m to 14m wide box culverts), which eventually leads to Marina Reservoir. Previously, stormwater from these areas was channelled directly into Stamford Canal. The SDC will now be able to relieve Stamford Canal of a portion of stormwater. </p><p style="text-align:left;"><br><strong>Completed Tunnel of Stamford Diversion Canal</strong></p><p style="margin:0cm 0cm 0pt;line-height:120%;"><span style="font-family:arial, sans-serif;"><strong><font color="#000000" size="3"><img src="" alt="" style="margin:5px;" /></font></strong></span> </p><p style="margin:0cm 0cm 0pt;line-height:120%;"><span style="font-family:arial, sans-serif;"><strong><font color="#000000" size="3"></font></strong></span><br> </p><font color="#000000" face="Times New Roman"> </font><p>The construction of the SDC has been challenging. The conventional method for drainage construction is open-cut, involving excavation of a trench. However, this method was not feasible for Grange Road as it is a densely built up area. PUB therefore used a tunnel boring machine instead to build the two underground 4.5 metres diameter tunnels. SDC is one of the shallowest large diameter tunnels in Singapore, with some areas a mere 4 metres underground.  </p><p><strong><em>"Both SDC and SDT are complex infrastructural projects that took us about four years to complete. We were very mindful during the whole construction phase, making sure that we can minimise inconvenience to the residents and businesses. For example, shallow tunnelling for SDC is a very challenging task as it allows very little room for error. We took extra precautions by monitoring the ground condition 24/7 during such works. The use of skilled expertise also ensured that the tunnelling underground was executed smoothly. Most times, most people do not even feel that there were major works underneath, life above ground went on as usual,"</em> </strong>said Principal Engineer from PUB's Catchment & Waterways Department, James Koh. </p><p style="text-align:justify;"><strong>Stamford Detention Tank (SDT)</strong></p><p>The SDT sits beneath the Singapore Botanic Garden's Tyersall Learning Forest's coach park and the National Orchid Nursery. Although the underground tank is as large as a football field, its facility building on the surface only takes up a fifth of this area, freeing up space for the coach park and nursery.</p><strong></strong><p style="text-align:left;"><img src="" alt="" style="margin:5px;" /> </p><p>The SDT is designed to temporarily store stormwater from the drains in Holland Road during a heavy rainfall. The excess stormwater will flow from the drains into a weir chamber where a pair of inlet pipes will then channel the water into the SDT by gravity. After the rain subsides, and water levels in the Holland Road drains fall, the water stored in SDT will then be pumped back into these drains which leads to SDC. The SDT can hold up to 38,000m<sup>3 </sup>or 15 Olympic sized swimming pools of stormwater which can be emptied in four hours to prepare the tank for the next heavy rainfall.<em> (Please refer to <a href="">Annex B</a> for infographic on how excess stormwater enters and exit SDT).</em></p><ul style="list-style-type:decimal;"><li><p><em class="ms-rteStyle-ImageDescriptionStyle"><strong>"Building bigger and bigger drains to deal with more and more intense rain is not a good method. The SDT/SDC is a better way. By detaining, delaying and diverting storm runoff before it can do serious harm, the SDT/SDC offers long-term flood protection for Orchard Road. The same rains that led to the Orchard Road floods eight years ago should not threaten our famous shopping street again,"</strong></em><strong> </strong>said Mr Ng Joo Hee, Chief Executive, PUB. </p></li><li></li><li></li></ul><p><br>As part of PUB's holistic stormwater management approach, PUB has also mandated developers to build detention tanks for all new and redevelopments projects that are larger than 0.2 hectares (2,000 square metres). These localised detention tanks within the industrial, commercial and residential developments, work similarly as the SDT, and will slow down the flow of stormwater into the public drainage system.  <br></p><p style="text-align:left;">                                                                                           ***​</p><p>PUB is a statutory board under the Ministry of the Environment and Water Resources. It is the national water agency, and manages Singapore’s water supply, water catchment and used water in an integrated way.</p><p>PUB has ensured a diversified and sustainable supply of water for Singapore with the Four National Taps (local catchment water, imported water, NEWater, desalinated water).</p><p>PUB calls on everyone to play a part in conserving water, in keeping our waterways clean, and in caring for Singapore’s precious water resources. If we all do our little bit, there will be enough water for all our needs – for commerce and industry, for living, for life. </p><p>​Like us at <a href=""><span style="text-decoration:underline;"><font color="#0066cc"></font></span></a> <br>Follow us on <a href=""><span style="text-decoration:underline;"><font color="#0066cc"></font></span></a> and <a href=""><span style="text-decoration:underline;"><font color="#0066cc"></font></span></a> <br>Subscribe to our channel at <a href=""><span style="text-decoration:underline;"><font color="#0066cc"></font></span></a> <br>For our latest event photos, visit <a href=""><span style="text-decoration:underline;"><font color="#0066cc"></font></span></a> or <a href=""><span style="text-decoration:underline;"><font color="#0066cc"></font></span></a> <br>Download our mobile apps: MyWaters for <a href=""><span style="text-decoration:underline;"><font color="#0066cc">iOS</font></span></a>, <a href=""><span style="text-decoration:underline;"><font color="#0066cc">Android</font></span></a> or <a href=""><span style="text-decoration:underline;"><font color="#0066cc">Windows Phone</font></span></a> <br>Visit our website at <a href=""><span style="text-decoration:underline;"><font color="#0066cc"></font></span></a> </p>1/10/2018 2:37:13 AM