Bioswale 2 Quebec Street at West 1st Avenue, Vancouver Canada

(Bio)swale

Created at: 02 May 2022

Description

Bioswale 2 Quebec Street at West 1st Avenue, Vancouver Canada

Bioswale 2 follows the same design parameters of Bioswale 1. The inlets of this practice are similar to those of Bioswale 1. The second inlet is to the south of the first one and they are spaced by 10.7 m (centerline to centerline). The outlet is located 8.6m (centerline to centerline) to the south of the second inlet. Figure 3.8 shows the cross-sections of Bioswale 2. The fully detailed engineering drawings can be found in Appendix C. This bioswale allows a maximum ponding depth of 28cm before overflowing. The practice is approximately 18.24m long and 1.4m wide (width based on base which is the smalles dimension). The average depth of this bioswale is 0.50m. The soil used for this practice a custom bioretention mix produced by VeratecĀ®. This soil mix is proprietary, and it does have added biofiltration capabilities or nutrient retention additives. The underdrain and 20cm clear crush layer have the same set-up as Bioswale 1. A monitoring manhole was installed and attached to the underdrain in order to monitor the outflows and water quality. A monitoring well was installed in this practice to track the water levels during storm events. Bioswale 2 collects and treats an EIA of 270m2 in addtion to the approxiamtely 25.5m2 of the bioswale practice itself. The catchment area includes a section from the sidewalk, bicycle lane, paved boulevard section. The boundaries were determined and calcualted by the GI Branch during design. I evaluated the boundaries in the field during the water quality sampling days. The areas are shown in Figure 3.9. The runoff drains to the curb, which in turn is sloped towards the inlets. From the bicycle lane, the water drains directly to the practice. Quebec Street is centerline crowned with a slope that varies between 1% to 2%. The water drains to the side gutter and ultimately into the GICB.


Samenvatting (Dutch description)

Bioswale 2 Quebec Street at West 1st Avenue, Vancouver Canada

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Floris Boogaard

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