Various practices will be used at the Canadian Port of Entry (POE) to manage stormwater runoff. One of the stormwater management measures being employed is boxed culverts which will allow stormwater to be diverted from paved areas to underground channels. The use of culverts will help prevent flooding, erosion and possible structural damage of paved areas.
In advance of the construction of the new perimeter access road (PAR) at the Canadian POE, more than 281 metres of box culverts are being installed. First, a trench measuring roughly 3.5 metres wide and 2 metres to 4 metres deep is excavated. The bottom of the trench is then sloped and a layer of granular material is placed and compacted to form bedding for the culvert. Next, the pre-cast concrete culvert sections are lowered into place on chains attached to an excavator. Each culvert section is 1.2 metres by 2.4 metres and weighs 450 kilograms. Once each culvert section is in place, it is shifted horizontally and carefully aligned to the adjoining piece. The end of each culvert section is fitted with a rubber gasket to ensure that the joints are water tight. Once installed, the box culverts are covered with compacted granular material.
The box culverts will carry rainfall from the PAR into stormwater management ponds and eventually into the Broadway Drain.
For more information on WDBA’s stormwater management activities, please see our Spotlight story at /en/spotlight-stormwater-management.