Changes

*the contributing drainage area is stabilized before the LID practice becomes operational;

*the contributing drainage area is stabilized before the LID practice becomes operational;

*environmentally sensitive areas and the LID practices themselves are protected during construction; and

*environmentally sensitive areas and the LID practices themselves are protected during construction; and

*[[inlet]], outlet, [[pretreatment]], and piped elements have the correct elevations and inverts.   

*[[inlet]], outlet, [[pretreatment]], and [[pipes|piped]] elements have the correct elevations and inverts.   

Furthermore, keeping records of these inspections helps to certify the works after construction and makes for a smooth assumption process.

Furthermore, keeping records of these inspections helps to certify the works after construction and makes for a smooth assumption process.

For this reason, Stages 1-2 and 5 of the LID construction process are fundamentally similar for all sub-surface and ground-level LID types. To illustrate, STEP's recommended processes for excavation do not differ between LID practice types. Excavation procedures are the same, whether for a bioretention garden or a permeable pavement parking lot. On the other hand, stage 4 sub-tasks will vary depending on whether the LID practice's surface is vegetated or permeable pavement. Some sub-tasks in stage 3 will also vary depending on the LID type. For example, permeable pavements often require compaction of sub-surface storage layers. The following sections give a brief description of each over-arching stage, a list of sub-tasks for each stage, and links to the page dedicated to each main LID construction stage.

For this reason, Stages 1-2 and 5 of the LID construction process are fundamentally similar for all sub-surface and ground-level LID types. To illustrate, STEP's recommended processes for excavation do not differ between LID practice types. Excavation procedures are the same, whether for a bioretention garden or a permeable pavement parking lot. On the other hand, stage 4 sub-tasks will vary depending on whether the LID practice's surface is vegetated or permeable pavement. Some sub-tasks in stage 3 will also vary depending on the LID type. For example, permeable pavements often require compaction of sub-surface storage layers. The following sections give a brief description of each over-arching stage, a list of sub-tasks for each stage, and links to the page dedicated to each main LID construction stage.

[[Green roof|Green roofs]], [[stormwater planters]], and [[rainwater harvesting]] systems have specific construction sequences and requirements that differ from the main sequence described above. STEP has developed guidance for [[green roof construction]]. When installing these BMP types, always consult the product manufacturer's guidance.

[[Green roof|Green roofs]] and [[rainwater harvesting]] systems have specific construction sequences and requirements that differ from the main sequence described above. STEP has developed guidance for [[green roof construction]]; '''guidance on installing rainwater harvesting practices is forthcoming'''. When installing these BMP types, always consult the product manufacturer's guidance.

==Pre-construction==

==Pre-construction==

The [[sub-surface components]] page gives guidance on:  

The [[sub-surface components]] page gives guidance on:  

*geotextile

*[[geotextile]]

*underdrain

*[[underdrain]]

*impermeable liners

*[[liner|impermeable liner]]

*overflow

*[[overflow]]

*monitoring wells

*[[wells|monitoring wells]]

*storage reservoir

*storage reservoir

**sub-base reservoir (permeable pavements)

**sub-base reservoir (permeable pavements)

**base course (permeable pavements)

**base course (permeable pavements)

**infiltration chamber installation

**[[infiltration chambers]]

*stone choker layer

*[[choker layer]]

*curbing

*curbing and [[curb cuts]]

*pre-treatment and inlet

*[[pretreatment]] and [[inlets]]

==Finishing grades and surface layer installation==

==Finishing grades and surface layer installation==