Rainwater Management

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water balance methodology

    FLASHBACK TO 2007: “The purpose of the ‘Beyond the Guidebook’ initiative is to help local governments and the development community establish what level of rainwater runoff volume reduction makes sense at the site, catchment and watershed scales,” stated Corino Salomi, Area Manager, Department of Fisheries & Oceans


    “It helps to look back to understand how we got to here. In 2000, DFO released Urban Stormwater Guidelines and Best Management Practices for Protection of Fish and Fish Habitat. That document set a direction. It got practitioners thinking about how to capture rainfall in order to reduce runoff volume and protect water quality. By 2007, however, we had concerns about how the document was being interpreted and applied. ‘Beyond the Guidebook 2007’ represented the initial course correction,” stated Corinio Salomi.

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    FLASHBACK TO 2010: “The East Clayton development in Surrey was the first development in the Lower Mainland of British Columbia that utilized Low Impact Development techniques and facilities,” explained Jim Dumont at the Rain to Resource Workshop hosted by the Okanagan Basin Water Board


    “The need to embrace LID practices arose from the need to prevent further increases in damage to both the environment and the agricultural community resulting from the increases in runoff from urban areas. The Neighbourhood Concept Plan (NCP) established rainfall capture objectives for maintaining the predevelopment runoff rates and volumes. The first phase of development brought the need to create calculation methods to verify that the designs complied with the NCP requirements,” stated Jim Dumont.

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    East Clayton ‘Green’ Development in Surrey established BC precedent for implementing performance target approach to rainfall capture


    “The Neighbourhood Concept Plan (NCP) established rainfall capture objectives to maintaining the predevelopment runoff rates and volumes. The clay soils and limited infiltration rates drove innovation in both the calculation methods and the design details to allow the volumetric runoff coefficient to be maintained in both single family and multi-family sites,” states Jim Dumont.

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