Project Description
Robinson Consultants Inc. was retained by the City of Ottawa to undertake the preliminary and detailed design for area traffic management and bioretention measures along Hemmingwood Way. The primary objectives of the assignment were to reduce the existing surface runoff through the implementation of bioretention measures and improve traffic safety along Hemmingwood Way. The proposed work included six bioretention rain gardens, two mid-block narrowings and a median, one intersection narrowing, and a Type C pedestrian crossover (PXO).
Several activities were completed to assess the suitability of the proposed LID measures including: drainage area delineation, hydrologic and hydraulic modelling, stormwater management modelling, geotechnical investigation, field permeability testing, groundwater level investigation, and Phase I and Limited Phase II Environmental Site Assessment, and consultation with environmental regulatory agencies. The field investigations revealed constrained conditions at some locations, including soils with low permeability and high groundwater table. Based on this detailed investigation, Robinson Consultants Inc. provided the City of Ottawa with recommendations for six bioretention cells located within proposed curb extensions. The inlets for the bioretention cells include a combination of curb cut inlets and cast-iron curb inlets. The preliminary and detailed design was completed and included a detailed landscaping and planting plan. Robinson Consultants Inc. prepared tender documents in accordance with the City of Ottawa standards and obtained the necessary environmental approvals.
