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→Storage Reservoir
===Storage Reservoir===
===Storage Reservoir===
Should be a minimum of 300 mm deep, and filled with granular material of washed 25 or 50 mm diameter crushed angular stone (max. wash loss of 0.5%). Include organic material derived from untreated wood (e.g. chips, mulch or shavings) to enhance nitrogen removal. Also see [[Bioretention: Internal water storage]]. See [[Bioretention: Sizing]] for reservoir sizing guidance, including depth and area of surface ponding and reservoir volume needed to capture and store the design storm.
Should be a minimum of 300 mm deep, and filled with granular material of washed 25 or 50 mm diameter crushed angular stone (max. wash loss of 0.5%). See [[Aggregates]] for further details. Include organic material derived from untreated wood (e.g. chips, mulch or shavings) to enhance nitrogen removal. Also see [[Bioretention: Internal water storage]]. See [[Bioretention: Sizing]] for reservoir sizing guidance, including depth and area of surface ponding and reservoir volume needed to capture and store the design storm.
===Plants===
===Plants===