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===Bioretention specific construction===
==Facilities containing media==
===Bioretention===
Sequencing depends on the design:
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]],
*'''Full infiltration:'''Pack 50 mm diameter clear stone to storage design depth, top with 100 mm of the [[choker course]],
*'''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]].
*'''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]].
===Stormwater planters===
===Stormwater planter specific construction===
*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;
*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;
===Rain gardens===
===Rain gardens===
No storage or drainage is required, filter media or [[amended topsoil]] is laid onto native soils
No storage or drainage is required, filter media or [[amended topsoil]] is laid onto native soils
==Media installation==
===Media installation===
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.
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.