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Line 34: − In areas where a 1.0 m separation cannot be provided, or where conditions dictate that an even greater separation may be warranted, additional discussion and/or analysis specific to the physical characteristics of the site and the proposed design should be completed. The design practitioner is advised to consult with approval agencies to understand their requirements and/or expectations prior to undertaking work, and to complete an appropriate level of analysis to support their conclusion. The requirement for additional investigation and/or documentation supporting a proposed design may be reduced in areas where ≥ 1.0 m separation is anticipated.+
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Both of these considerations are equally relevant to the [[underdrain]] of any structural BMP.
Both of these considerations are equally relevant to the [[underdrain]] of any structural BMP.
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Whilst this is a great rule of thumb, like all aspects of LID, this 1 meter figure might require amendment on a site-by-site basis.
Whilst this is a great rule of thumb, like all aspects of LID, this 1 meter figure might require amendment on a site-by-site basis. In areas where a 1.0 m separation cannot be provided, or where conditions dictate that an even greater separation may be warranted, additional discussion and/or analysis specific to the physical characteristics of the site and the proposed design should be completed. The design practitioner is advised to consult with approval agencies to understand their requirements and/or expectations prior to undertaking work, and to complete an appropriate level of analysis to support their conclusion. The requirement for additional investigation and/or documentation supporting a proposed design may be reduced in areas where ≥ 1.0 m separation is anticipated.
Factors to consider include:
Factors to consider include:
*risks due to short periods of groundwater mounding and potentially unobserved seasonal fluctuations.
*risks due to short periods of groundwater mounding and potentially unobserved seasonal fluctuations.
<ref>Rathfelder, K., and M. Wei. “Underground Stormwater Infiltration: Best Practice for Protection of Groundwater Resources in British Columbia,” 2014. http://www.env.gov.bc.ca/wsd/plan_protect_sustain/groundwater/library.html</ref> in turn citing <ref>Washington St.ate Department of Ecology. “Guidance for UIC Wells That Manage Stormwater,” 2006.</ref>
<ref>Rathfelder, K., and M. Wei. “Underground Stormwater Infiltration: Best Practice for Protection of Groundwater Resources in British Columbia,” 2014. http://www.env.gov.bc.ca/wsd/plan_protect_sustain/groundwater/library.html</ref> in turn citing <ref>Washington St.ate Department of Ecology. “Guidance for UIC Wells That Manage Stormwater,” 2006.</ref>
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