Technical Luncheon – Calgary, AB


We’re back in Calgary! After a long period of modified work practices, we are restarting the Calgary Technical Luncheons. We want to get the face-to-face interactions back, so this luncheon will be at no cost to NASTT Members. Note there will be a maximum number of attendees we can handle, so please register early.

Please join us for a technical luncheon on Thursday, November 24, 2022.

Deadline to RSVP: Thursday, November 17
Event Date: Thursday, November 24
Location: Danish Canadian Club, Tivoli Room | 727 11 Ave SW Calgary, AB T2R 0E3
Time: 11:30 am Registration | 12:00 pm Lunch | 12:30 pm Guest Speaker | 1:30 pm Adjournment
Cost: Members: FREE • Non-Members: $20.00 paid at door.
Payments taken at the door by cash or cheque.
*Note: Membership status will be verified against the Northwest Chapter’s current member list. If your name is not on the chapter member list, you will be asked to pay the non-member rate. To check if you are a registered member of NASTT, please visit and search the member directory for your name; this directory is current with NASTT’s membership records.

Presentation: A two-part presentation based on sister projects completed in southeast Calgary earlier this year: Ogden Water Feedermain Highway (Deerfoot Trail) Crossing and Seton Storm Trunk & Bow River Outfall Escarpment Drop

Abstract #1 – Ogden FM Highway Crossing
The Ogden Water Feedermain was designed to provide potable water service to 767 hectares of residential and commercial development in the Rangeview and Ricardo Ranch areas being developed in southeast Calgary. This feedermain extension has a total length of 10.27 km with a diameter of 900 mm and is divided into two phases for the design and construction. Phase 1 connects to the existing Cranston Feedermain just north of Cranston Avenue SE and west of the Deerfoot Trail (Highway 2), runs south along the Deerfoot Trail highway right-of-way then east on 212 Avenue SE to its terminus east of future 52 Street SE, a total distance of approximately 4.4 km. Phase 1 includes a crossing of Deerfoot Trail SE which (provincial Highway 2), Alberta’s and Calgary’s primary north-south highway corridor.

The Deerfoot Trail crossing presented a number of constructability challenges that the design had to address. These included limited working space between the developments adjacent to the Deerfoot Trail right of way and the edge of pavement, existing noise berms on both sides, major overhead power lines, water, sanitary and storm utility crossings, and temporary relocation of the overland drainage in the existing ditch systems on both sides of the highway. In addition, a preinstalled CMP casing for crossing Cranston Avenue SE and Fiberglass Reinforced Polymer (FRP) pipe pre-installed by local development provided further constraints on the feedermain alignment options.
During the preliminary design phase, three potential trenchless crossing locations were identified along Deerfoot Trail. All three locations have similar limited room and site access on the west side for constructing a reception shaft. A Triple Bottom Line (TBL) approach was used to evaluate the crossing location options, and Option 1, the most northerly location was determined to be the preferred crossing location. At this location there are four traffic lanes in each direction plus the on and off ramps resulting in the trenchless crossing being approximately 120 m in length.

This presentation will provide an overview of the challenges that the design had to overcome, site investigations, selection of options for crossing Deerfoot Trail and evaluation of the available trenchless methods to complete the crossing, considerations for pipe material selection, and procurement for construction for both the traditional and trenchless installation sections of the project under one Prime Contractor. We will also touch on the lessons learned during construction of the project.

Abstract #2 – Seton
The Seton Storm Trunk and Outfall to the Bow River was designed to convey clean stormwater flows from the communities of Rangeview and Ricardo Ranch being developed in southeast Calgary. The Seton Storm Trunk has a total length of 2.3 km with diameters ranging from 900 mm to 1,500 mm, and will provide servicing for an area of 614 hectares. Approximately 2.0 km of the storm trunk were installed by conventional open cut trenched installation. The fun starts when the storm trunk reaches the top edge of the Bow River escarpment where the ground elevation drops 50+ m in a horizontal distance over approximately 175 m. There are a number of groundwater springs along the toe of the escarpment where it meets the floodplain. There are also several known areas where soil creep is occurring to the east of the proposed storm trunk alignment, likely due to the shallow groundwater table in combination with surface water drainage paths.

Once again Triple Bottom Line analysis of the available options determined the most viable and cost-effective trenchless installation option that reduced the possible environmental impact on the escarpment slope. To meet the hydraulic requirements of the project it was determined that a 900 mm HDPE pipe installed at a slope of just over 14% was required for capacity. At this slope, a major energy dissipation structure was required at the bottom prior to the flow being discharged through to the new outfall to the Bow River. The drill entry location, drop sequencing from gravity to supercritical flow and energy dissipation were major design elements for addressing tie-ins to this trenchless installation.

This presentation will provide an overview of the challenges, both geotechnical and hydraulic, that the design had to overcome. The result was a complex HDD plan set out to complete the work. We will also touch on the lessons learned during the procurement and construction of the project.