In August 2014, Patching Associates was retained to provide a Noise Impact Assessment (NIA) of the functional design of the West and Southwest Calgary Ring Road (WCRR and SWCRR) for Alberta Transportation and the City of Calgary. The study included 40 km of road, 70 bridges and 20 interchanges. Patching Associates submitted the final report in April 2015.
The primary objective of this work was to ensure that the noise emissions from the roadways met both the Alberta Transportation Highway and the City of Calgary Surface Transportation noise policies in all the adjacent residential areas.
Creating a detailed model using sophisticated software allowed Patching Associates to predict levels not just at “representative” receivers, but to extend the analysis to all adjacent residential areas, allowing confirmation of predicted levels throughout and adjustments to the proposed barriers accordingly.
Patching Associates executed this project using SoundPLAN® noise modelling software, which incorporates the internationally recognized Transportation Noise Modelling (TNM) algorithms first proposed by the Federal Highway Administration. This software afforded Patching Associates a high degree of accuracy and flexibility in the noise model to accommodate design changes.
A key feature of SoundPLAN is its ability to model immense projects including entire city infrastructures. The software has been verified through numerous tests to be representative of expected real world results, and is capable of incorporating the many factors that can affect noise predictions, including detailed terrain mapping, road modeling, traffic volumes, barriers, buildings, and receiver locations.
Experienced project staff developed a detailed noise model that predicts where and when barriers are anticipated along the new roadways.
Patching Associates provided recommendations for improving existing barriers and berms, and the addition of new ones, to achieve target sound levels at all adjacent properties.
The recommended measures will reduce noise experienced by residents, and reduce the risk of noise concerns at key locations where target levels would have been exceeded.
By creating a detailed and flexible model, Patching Associates was able to focus on delivering cost-efficient noise control designs and ensuring adjacent residential areas were protected from noise emissions from the proposed West/Southwest Calgary Ring Road design.