2020.11.30 - Response to further RFI - OPW200145

  Stormwater

  General

i) The discharge of flows into the biopods is raised in a number of items below. Reference should be made
   to Section 3.4.2.2 of the Bioretention Technical Design Guidelines (Water by Design, 2012) for advice
   on addressing these issues
  Stockwell Response

  Inlet details have been provided on all bioretention and street tree device plans, to demonstrate inlet functions
  into the basins. Please refer to Barlow Shelley drawings 1856-SW19E – SW30E.
  Drawing SW19
i) Provide a section at the lowest point in the roadway adjacent to the biopod and show that the extended
   detention depth in the biopod will not pond into the kerb channel at that point.
  Stockwell Response
  The kerb lip levels for the lowest point in Road A along the line of the basin have been provided on the
  bioretention section and are also shown in the layout to show the position. This is consistent with the road design
  plans and demonstrates the extended detention does not pond past the kerb invert into the roadway.




                                  Figure 8: Barlow Shelley drawing 1856-SW19 E


ii) Provide details of how the cut-outs of the barrier kerb will be managed to avoid scour of the biopod
    batter.
  Stockwell Response

  Inlet details have been provided on all bioretention and street tree device plans, to demonstrate inlet functions
  into the basins. Please refer to Barlow Shelley drawings 1856-SW19E.
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