Rainwater Management Amenities in Urban Centers

Description:The City of Burnaby is redeveloping its high-density town centres with plans to incorporate substantial landscaping features into City owned rights-of-way fronting developments. Given the framework established by Metro Vancouver's Liquid Waste Management Plan and current trends toward improving the management of rainwater, these landscape features have been identified as potential opportunities to implement Rainwater Management Amenities (RMAs), that serve both an aesthetic role for the enjoyment of the public and allow for reduction in runoff and improvements in the water quality of runoff. The scope and scale of RMAs in Brentwood and Metrotown town centres is extensive and approaches 30 km of linear raingardens and 500 green curb bulges at build out. The juxtaposition of forested ravines and towers on Burnaby's diverse topography creates a beautiful contrast that is challenging for water management solutions. Typical rainfalls are fairly heavy and soils located in urban centres have low to very low infiltration capacities and when combined with the amplification of rainfall, an RMA may be significantly overloaded and hard pressed to achieve a meaningful benefit in addressing runoff from a catchment area. In addition, the challenges and constraints of traffic impacts, utility conflicts, volume, and contaminant loading needed to be considered. Significant analysis was required to determine the appropriate balance of engineering design requirements that could effectively reduce or attenuated runoff volumes and improved water quality while addressing constraints and risks. A multidisciplinary approach allowed us to achieve town centre specific RMA standards in dense urban areas.

Authors: Kel Coulson; May Phang

Subjects:

Tags:AC14,2014 Annual Conference,Rainwater management ,AC2014

Citation:Stream F. 2.5.

Publication Date:May 5th, 2014 Upload Date:Jun 30th, 2014

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