Tree Trench (Structural soil STT) Quebec Street at West 1st Avenue, Vancouver Canada

Tree Pits

Created at: 02 May 2022

Description

Tree Trench (Structural soil STT) Quebec Street at West 1st Avenue, Vancouver Canada

The structural soil STT at this location is built under a bicycle lane. This type of application shows the versatility of STT. Structural soil STT can be adapted into locations where utilities are present, and space is limited. The runoff is collected by a dedicated CB denominated as “GICB”. If the GICB is bypassed, a secondary CB is located 1.7m to the south. The secondary CB is connected to the stormwater sewer directly. The only connection of the GICB is the 6” feeder pipe (at 1% slope) that connects into the 6” distribution pipe laid (at 0% slope) along the length of the practice. The feeder pipe and the distribution pipe are connected by a bend of 135°. Utilizing connection angles not sharper than 135° is important for maintenance reasons. The operation crews of the CoV require large bends in order to use their snaking and scoping equipment when doing regular maintenance. Sharper bends would require the installation of an additional manhole or inspection chamber. This practice has a 4” perforated underdrain with the function of collecting the exccess stormwater that does not get to infiltrate into the native soils. The underdrain is laid along the length of the STT and it is placed at 0% gradient. At the end of the practice, the underdrain expands to a 6” solid pipe which is sloped at a 1%. This pipe is connected directly to the stormwater sewer. Figure 3.4 shows the cross section of the structural soil STT. The fully detailed engineering drawings can be found in Appendix C. The practice is approximately 18.24m long and 2.5m wide with a typical depth of 0.85m across the practice. A monitoring well was installed to track the water levels in the practice. This practice uses a custom structural soil and Veratec® bioretention blend as the structural soil in order to increase the water quality treatment efficiencies of this STT. A monitoring manhole was installed and connected to the underdrain pipe. This manhole will be used to monitor the outflows and water quality. This STT collects and treats an EIA of 415m2.


Samenvatting (Dutch description)

Tree Trench (Structural soil STT) Quebec Street at West 1st Avenue, Vancouver Canada

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Floris Boogaard

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