<p>This type of bioretention facility provides the highest level of stormwater volume control. Although this design does not include an underdrain, an overflow pipe, weir or other outlet structure must be included.</p>
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<div class="col-md-8">
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===Overview===
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<p>This type of bioretention facility provides the highest level of stormwater volume control. Although this design does not include an underdrain, an overflow pipe, a weir or other outlet structure must be included. </p>
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===Planning Considerations===
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===Performance===
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<h4>Planting considerations</h4>
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{{:Bioretention: Planting plans}}
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===Materials===
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===Design Specifications===
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<ul>
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<ol>
<li>[[Reservoir gravel]]</li>
<li>[[Reservoir gravel]]</li>
<li>[[Pea gravel]]</li>
<li>[[Pea gravel]]</li>
<li>[[Geotextiles]]</li>
<li>[[Geotextiles]]</li>
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<li>[[Pipes]]</li>
<li>[[Biomedia]]</li>
<li>[[Biomedia]]</li>
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</ul>
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<li>[[Erosion control blankets|Erosion control]]</li>
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<h4>Planting</h4>
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<li>[[Mulch|Mulch]]</li>
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{{:Bioretention:Plant list}}
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<li>[[Bioretention: Planting plans|Planting considerations]] and [[Bioretention: Plant list| Recommended species]]</li>