Robinson Consultants Inc. was retained by the City of Ottawa to undertake the preliminary and detailed design for the replacement of eight existing culverts. The renewal structures included CSP and concrete round pipe. The culvert replacements were split into five separate contract packages for staggered delivery and construction. The replacement structures size ranged from 600mm to 3000mm in diameter. Trenchless renewal methods were designed for two of the sites using Cured-in-Place (CIPP), HDPE sliplining, and auger boring. One of the culverts failed during the design phase and required a road closure and emergency replacement operation.
Several activities were completed to support the design, including: hydrologic and hydraulic modelling, assessment of trenchless rehabilitation measures, geotechnical study, natural environment study, and consultation with environmental and federal regulatory agencies. Robinson Consultants Inc. completed the preliminary and detailed design including traffic and construction staging plans, temporary flow control, guiderails, and utility protection measures. Robinson Consultants Inc. also prepared tender documents in accordance with the City of Ottawa standards, attended meetings with utility companies, prepared property requirement plans, and obtained the necessary environmental approvals.