culvert and other infrastructure projects in British Columbia. The list- ings for polypropylene pipe can be found in MMCD Section 33 40 01: Storm Sewers, Mainline Profile and in Section 33 42 13: Pipe Culverts, Open Profile. ADS SaniTite HP polypropylene pipe is certified to meet CSA Stan - dard B182.13 by Intertek, a third-party certification body authorized by the Standards Council of Canada (SCC) to certify products. Ad- ditionally, the structural performance of SaniTite HP has been evalu - ated in accordance with American Association of State Highway and Transportation Officials (AASHTO) Load Resistance Factor Design (LRFD) Bridge Design Specifications. SaniTite HP is accepted by the British Columbia and Ontario Ministries of Transportation (BCMOT and MTO), the Ontario Provincial Standards (OPS) and meets ASTM F2764 with 100 kPa (15psi) joints tested in accordance with ASTM D3212 for water tightness. Installation of the new pipeline was done by Complete Utility Contrac - tors Ltd. (Pitt Meadows, B.C.) with a crew of four to seven. “To get through the bedrock, we had two excavators with large hoe ram attach- ments, but we did have to blast in some areas,” said Adam Matheos, project manager for Complete Utility Contractors. “We laid in the pipe sections concurrently. We excavated and didn’t get too far ahead so the pipe would line up. And because the ADS pipe is lighter than the concrete and comes in longer sections, it definitely made for a quicker installation. There were fewer joints and it was easier to put into the ground and push together. This made it much easier going through residential areas at a pretty significant grade and we were anywhere from three to four meters deep. Naturally, the bedrock was more chal - lenging but even though this was our first time using the ADS pipe in such large diameters, it was easy to work with and very durable.” The pipe came from the ADS plant with special five-degree mitres for some sections. “Those five-degree bends were needed for constructing the pipe around within the existing roads, and for running between existing underground utilities and services,” stated Lowe. “We tried to create smooth circular radius curves or bends which we achieved using the SaniTite.” Specific sections of the pipe were fabricated at the ADS plant to include a riser with a ladder inside to act as a manhole. In addition to the new stormwater management system, the project will also include the relocation of water mains, complete reconstruction of roads and resurfacing and the addition of sidewalks. When completed, the project will increase the level of flood protection for homes below the Upper Levels Highway. Rerouting the excess stormwater will also reduce erosion, help to safeguard residents and property while accomplishing its original goal of protecting the water- shed health of the Five Creek drainage areas. Additional information about ADS can be found at: www.adspipe.com.
“We obviously didn’t want to dry out these creeks, and it was important to maintain the environmental benefits of those creeks. Essentially, we removed the large rain events from the creek, which provides pro- tection to the downstream properties and an area of around 500 acres containing numerous homes.” Maximizing the hydraulic efficiency of the pipe conveying the di - verted water was a key in selecting the type of pipe that would be used. Lowe’s plan called for pipe in diameters from 1500mm to 1800mm (60 to 72 in) to accommodate the volume of runoff. He first considered us - ing all reinforced concrete pipe (RCP). In order to meet the hydraulic design consideration, however, there was a desire for it to be would lined, in order to provide protection against abrasion which would add to the cost. “As we designed the alignment and calculated the hydraulic need for conveying gravity flow runoff down the steep grade from the base of Cypress Mountain all the way to the Pacific, that led us to thinking about thermoplastic types of pipe,” he explained. “SaniTite only goes up to 1500mm diameter. At some points we needed 1800mm diameter pipe. So, we couldn’t use it for all the run, but we reached a com- promise. The reason we went with it was because the pipe provides excellent hydraulics, being so smooth on the inside, plus it’s also very durable as well, so it is resistant to operational damage from any sedi- ment that enters the pipe. Our materials selection was acceptable to the District of West Vancouver.” Previous to the Five Creeks project, ADS submitted its SaniTite HP polypropylene pipe to the Master Municipal Construction Documents Association, Civil Committee, which unanimously approved it and material and added the pipe to the Master Municipal Construction Documents (MMCD) list of approved products for use in highway, The new pipe system will enable storm level flows to be managed within the Five Creeks area of West Vancouver and will reduce the impact of intense storms in Westmount and West Bay. Photo: ADS
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csengineermag.com
july 2021
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