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Line 1: − <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+ − Elevations of the following items should be checked for accuracy:+ − • 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 + − + − + − • Correct vegetation should be planted.+ − • Pretreatment area should be stabilized.+ − • Drainage area should be stabilized prior to directing water to the bioretention.+ − + − + − • Outfall protection/energy dissipation at concentrated inflow should be stable.+ − • Flow should not concentrate and should spread evenly over the filter bed.+ − • 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.+ − • Excessive sediment accumulation should not be present.+ + + + + + +
no edit summary
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>
<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>
<tr><td></td><td>Proper erosion and sediment controls should be in place for the drainage area</td></tr>
<tr><th colspan =2>Materials</th></tr>
<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>
<tr><td></td><td>Underdrain pipe material should be perforated and of the correct size</td></tr>
<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>
<tr><th colspan =2>Elevations</th></tr>
<tr><td width = "5%"></td><td>Depth of the gravel and invert of the underdrain</td></tr>
<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>
<tr><td></td><td>Mulch depth</td></tr>
<tr><th colspan =2>Landscaping and Stabilization</th></tr>
<tr><td width = "5%"></td>Correct vegetation should be planted</td></tr>
<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>