Changes

===Infiltration construction===

===Bioretention specific construction===  

Sequencing depends on the design:

*'''Full infiltration:'''Pack 50 mm diameter clear stone to storage design depth, top with 100 mm of the [[choker course]],

The options at this step depending on the design:<br>

*'''Partial infiltration:'''Place design depth of 50 mm diameter clear stone for the infiltration volume on bed and then lay the perforated underdrain pipe over it. Pack more clear stone to 75 mm above the top of the underdrain, top with 100 mm of [[choker layer]].

<strong>Full infiltration:</strong>Pack 50 mm diameter clear stone to storage design depth, top with 100 mm of pea gravel and the geotextile drainage fabric.<br>

 

<strong>Partial infiltration:</strong>Place design depth of 50 mm diameter clear stone for the infiltration volume on bed and then lay the perforated underdrain pipe over it. Pack more clear stone to 75 mm above the top of the underdrain, top with 100 mm of pea gravel and the geotextile drainage fabric.<br>

<strong>No infiltration:</strong> Place an impermeable liner on the bed with 150 mm overlap on sides. Lay the perforated underdrain pipe, Pack 50 mm diameter clear stone to 75 mm above top of underdrain, top with 100 mm of pea gravel and the geotextile drainage fabric.<br>

*Place an impermeable liner on the bed with 150 mm overlap on sides. Lay the perforated underdrain pipe, Pack 50 mm diameter clear stone to 75 mm above top of underdrain, top with 100 mm of choker layer;

<strong>Rain garden:</strong> No storage or drainage is required, biomedia is laid onto native soils. <br>

 

*Biomedia is installed over the geotextile fabric in 0.3 m lifts until desired top elevation is achieved. Each lift must be thoroughly wetted and drained before adding the next. Wait three weeks to check for settling, and add additional media and regrade as needed.<br>

===Rain gardens===

No storage or drainage is required, filter media or [[amended topsoil]] is laid onto native soils

 

Media installed over the choker course in 0.3 m lifts until desired top elevation is achieved. Each lift must be thoroughly wetted and drained before adding the next. Wait three weeks to check for settling, and add additional media and regrade as needed.

*Prepare planting holes for any trees and shrubs, install vegetation, and water accordingly.  

*Prepare planting holes for any trees and shrubs, install vegetation, and water accordingly.  

*Install any temporary irrigation.

*Install any temporary irrigation.

*Lay down surface cover in accordance with the design (mulch, riverstone, or turf).  

*Lay down surface cover in accordance with the design (mulch, riverstone, or turf).  

*Conduct final construction inspection, checking inlet, pretreatment, bioretention cell and outlet elevations.

*Conduct final construction inspection, checking inlet, pretreatment, bioretention cell and outlet elevations.

*Remove erosion and sediment controls, only when the entire drainage area is stabilized  

*Remove erosion and sediment controls, only when the entire drainage area is stabilized.

==Checklists==

==Checklists==