Difference between revisions of "Bioretention: Construction checklist"

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Common construction pitfalls can be avoided with careful construction supervision that focuses on the following aspects:
Common construction pitfalls can be avoided with careful construction supervision that focuses on the following aspects:
<table table class = wikitable>
<table table class = wikitable>
<tr><th colspan =2>Erosion and Sediment Control<th>
<tr><td></td><td>Bioretention locations should be blocked from construction traffic and should not be used for erosion and sediment control.</td></tr>
<tr><td></td><td>Proper erosion and sediment controls should be in place for the drainage area.</td></tr>
</table>
Materials
• Gravel for the underdrain should be clean and washed; no fines should be present in the material.
• Underdrain pipe material should be perforated and of the correct size.
• A cap should be placed on the upstream (but not the downstream) end of the underdrain.
• Biomedia should be tested to confirm that it meets specifications.
• Mulch composition should be correct.


Elevations
<tr><th colspan =2>Erosion and Sediment Control</th></tr>
Elevations of the following items should be checked for accuracy:
<tr><td width = "5%"></td><td>Bioretention locations should be blocked from construction traffic and should not be used for erosion and sediment control</td></tr>
Depth of the gravel and invert of the underdrain
<tr><td></td><td>Proper erosion and sediment controls should be in place for the drainage area</td></tr>
Inverts for inflow and outflow points
<tr><th colspan =2>Materials</th></tr>
Filter depth after biomedia is placed  
<tr><td width = "5%"></td><td>Gravel for the underdrain should be clean and washed; no fines should be present in the material</td></tr>
Ponding depth provided between the surface of the filter bed and the overflow structure  
<tr><td></td><td>Underdrain pipe material should be perforated and of the correct size</td></tr>
Mulch depth  
<tr><td></td><td>A cap should be placed on the upstream (but not the downstream) end of the underdrain</td></tr>
 
<tr><td></td><td>Biomedia should be tested to confirm that it meets specifications</td></tr>
Landscaping and Stabilization
<tr><td></td><td>Mulch composition should be correct</td></tr>
Correct vegetation should be planted.
<tr><th colspan =2>Elevations</th></tr>
Pretreatment area should be stabilized.
<tr><td width = "5%"></td><td>Depth of the gravel and invert of the underdrain</td></tr>
Drainage area should be stabilized prior to directing water to the bioretention.
<tr><td></td><td>Inverts for inflow and outflow points</td></tr>
 
<tr><td></td><td><strong>Filter depth?</strong> after biomedia is placed</td></tr>
The following items should be checked after the first rainfall event, and adjustments should be made as necessary:
<tr><td></td><td>Ponding depth provided between the surface of the filter bed and the overflow structure</td></tr>
Outfall protection/energy dissipation at concentrated inflow should be stable.
<tr><td></td><td>Mulch depth</td></tr>
Flow should not concentrate and should spread evenly over the filter bed.
<tr><th colspan =2>Landscaping and Stabilization</th></tr>
Ponded water at the surface of the bioretenton facility should drain within 24 hours of the end of the storm event.  The filter media bed should fully drain within a maximum period of 72 hours.
<tr><td width = "5%"></td>Correct vegetation should be planted</td></tr>
Excessive sediment accumulation should not be present.
<tr><td></td><td>Pretreatment area should be stabilized</td></tr>
<tr><td></td><td>Drainage area should be stabilized prior to directing water to the bioretention</td></tr>
<tr><th colspan =2>The following items should be checked after the first rainfall event, and adjustments should be made as necessary:</th></tr>
<tr><td width = "5%"></td>Outfall protection/energy dissipation at concentrated inflow should be stable</td></tr>
<tr><td></td><td>Flow should not concentrate and should spread evenly over the filter bed</td></tr>
<tr><td></td><td>Ponded water at the surface of the bioretenton facility must drain within 24 hours of the end of the storm event.  The filter media bed should fully drain within a maximum period of 72 hours</td></tr>
<tr><td></td><td>Excessive sediment accumulation should not be present</td></tr>

Revision as of 15:43, 5 July 2017

Common construction pitfalls can be avoided with careful construction supervision that focuses on the following aspects:

Correct vegetation should be plantedOutfall protection/energy dissipation at concentrated inflow should be stable
Erosion and Sediment Control
Bioretention locations should be blocked from construction traffic and should not be used for erosion and sediment control
Proper erosion and sediment controls should be in place for the drainage area
Materials
Gravel for the underdrain should be clean and washed; no fines should be present in the material
Underdrain pipe material should be perforated and of the correct size
A cap should be placed on the upstream (but not the downstream) end of the underdrain
Biomedia should be tested to confirm that it meets specifications
Mulch composition should be correct
Elevations
Depth of the gravel and invert of the underdrain
Inverts for inflow and outflow points
Filter depth? after biomedia is placed
Ponding depth provided between the surface of the filter bed and the overflow structure
Mulch depth
Landscaping and Stabilization
Pretreatment area should be stabilized
Drainage area should be stabilized prior to directing water to the bioretention
The following items should be checked after the first rainfall event, and adjustments should be made as necessary:
Flow should not concentrate and should spread evenly over the filter bed
Ponded water at the surface of the bioretenton facility must drain within 24 hours of the end of the storm event. The filter media bed should fully drain within a maximum period of 72 hours
Excessive sediment accumulation should not be present