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Monahan Creek Municipal Drain


City of Ottawa


Ottawa, Ontario

Construction Value




Key Features

  • Section 78 of the Ontario Drainage Act
  • Drain modifications and improvements
  • Deepening and widening of the drain
  • Establishment of permanent sediment and erosion control
  • Special design for the replacement of six low level crossings

Project Description

The original Monahan Creek Municipal Drain was constructed in 1968. At that time, the drain served a largely rural/agricultural area. Subsequent years saw significant urban development in the upper reaches of the drain which included abandonment, improvements, sections incorporated as storm sewers, and the development of an urban constructed wetland stormwater management facility. However, during this period the downstream end of the drain and outlet capacity remained unchanged.

The City of Ottawa appointed Robinson Consultants Inc. under Section 78 of the Ontario Drainage Act, R.S.O. 1990, as the Drainage Engineer for modification and improvement of the Monahan Creek Municipal Drain.

Initial review indicated that the original 1968 design could no longer provide sufficient outlet for the growing urban infrastructure.

Design included the deepening and widening of the drain and establishing permanent sediment and erosion control features as well as special design for the replacement of six low-level crossings. The design incorporated provisions to address the concerns of environmental agencies including the Department of Fisheries and Oceans, Rideau Valley Conservation Authority, and the Ministry of Natural Resources. Best management practices were developed and successfully implemented to allow for authorization, permitting, and the protection of endangered species.