Setting Performance Targets

FLASHBACK TO 2010 FROM RAIN TO RESOURCE WORKSHOP: “The Water Balance Model allows the user to quickly establish the existing base line that will become the standard used to measure the performance of future development scenarios,” stated Jim Dumont

“The WBM embeds land use zoning from municipal member partners, soil calculator and a new calculation engine QUALHYMO utilizing the Environment Canada climate data that includes rainfall, snow, temperature and evaporation. The easy access and calculation speed combined with the embedded data and information allows the user to easily and effectively plan and design green infrastructure techniques which will achieve the vision and objectives established for the Site, the Development, or Watershed,” stated Jim Dumont.

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Capture Rain Where It Falls: At 2007 Water Balance Model Partners Forum, Ted van der Gulik and Jim Dumont explained development and application of Performance Targets

“We have observed that the power of the Water Balance Model process lies in the conversations that result from users generating a single number – the percentage of rainfall that becomes runoff – that represents the synthesis of any particular scenario. Comparison of scenarios creates understanding, especially when the focus is on the hydrologic implications of the assumptions that underpin those percentages,” stated Ted van der Gulik.

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Capture Rain Where It Falls: At 2007 Water Balance Model Partners Forum, Ministry of Environment's Peter Law provided historical context for Performance Target Methodology

“When we wrote the Guidebook, we recognized there is a material difference in the characterization of surface runoff that originates from an individual development site versus flow that you see at a catchment or watershed scale. What you see in a watercourse is the total flow – that is, water that flows overland plus water that moves through soil until it daylights,” stated Peter Law.

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Rainwater Management in a Watershed Sustainability Context – What’s the Goal?

“The stream health methodology embedded in the Water Balance Model enables a watershed target to be established. It also enables the user to assess how to meet the watershed target at the site scale. This helps planners and designers wrap their minds around how to implement ‘design with nature’ solutions on-the-ground,” explains Ted van der Gulik.

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City of Surrey moves beyond pilot projects to a watersheds objectives approach to green infrastructure implementation

“A decade of on-the-ground experience has enabled the City of Surrey to move beyond pilot projects to a broader watershed objectives approach to on-site rainfall capture. As we move forward, the new Drainage By-Law endorsed by Council in 2008 is the tool that will enable the City to establish watershed-specific performance targets for rainwater runoff volume and rate reduction,” states Remi Dubé,

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Characterizing Stormwater Quality: A Fool's Errand?

“Our community wash-off models have for 40 years been structured based on land use: residential, commercial, and industrial. The deep weakness of such models is that the structure is not directly related to the BMP programs. Let’s consider structuring our models based on scape: roadscape, parkingscape, roofscape, and landscape,” writes Gary Minton.

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