Difference between revisions of "Construction"

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#[[Pre-construction]]
#[[Pre-construction]]
#[[Excavation and grading]]
#[[Excavation and grading]]
#Sub-surface components
#[[Sub-surface components]]
#Finishing grades: inlet, outlet, and surface layer
#Finishing grades: inlet, outlet, and surface layer
#Post-construction
#Post-construction
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Stages 1-3 and 5 of the LID construction process are fundamentally similar for all '''surface-level LID''' types (bioretention, bioswales, enhanced grass swales, permeable pavements, infiltration chambers, infiltration trenches, soakaways, etc.). To illustrate, STEP's recommended processes for excavation do not differ depending on the practice type. Excavation is excavation, whether it is for a bioretention garden or a permeable pavement parking lot. On the other hand, stage 4 sub-tasks will vary substantially from LID type to LID type, as do some sub-tasks in stage 3. The following gives a brief explanation of each over-arching stage and links to the pages dedicated to each construction stage.
Stages 1-3 and 5 of the LID construction process are fundamentally similar for all '''surface-level LID''' types (bioretention, bioswales, enhanced grass swales, permeable pavements, infiltration chambers, infiltration trenches, soakaways, etc.). To illustrate, STEP's recommended processes for excavation do not differ depending on the practice type. Excavation is excavation, whether it is for a bioretention garden or a permeable pavement parking lot. On the other hand, stage 4 sub-tasks will vary substantially from LID type to LID type, as do some sub-tasks in stage 3. The following gives a brief explanation of each over-arching stage and links to the pages dedicated to each construction stage.


''Green roofs, blue roofs, and rainwater harvesting systems''' each has specific construction requirements. One day we will write guidance for these LID practices as well  
''Green roofs, blue roofs, and rainwater harvesting systems''' have specific construction requirements. One day we will write guidance for these LID practices as well  


===Pre-construction===
===Pre-construction===

Revision as of 18:10, 3 August 2022

Overview[edit]

  • Importance of construction inspections
  • Contractor familiarity
  • What you can expect from STEP guidance: practical advice, specific to LID, practical advice on how to ensure successful construction

Construction stages[edit]

STEP divides the construction process for LID practices into five over-arching stages:

  1. Pre-construction
  2. Excavation and grading
  3. Sub-surface components
  4. Finishing grades: inlet, outlet, and surface layer
  5. Post-construction

Stages 1-3 and 5 of the LID construction process are fundamentally similar for all surface-level LID types (bioretention, bioswales, enhanced grass swales, permeable pavements, infiltration chambers, infiltration trenches, soakaways, etc.). To illustrate, STEP's recommended processes for excavation do not differ depending on the practice type. Excavation is excavation, whether it is for a bioretention garden or a permeable pavement parking lot. On the other hand, stage 4 sub-tasks will vary substantially from LID type to LID type, as do some sub-tasks in stage 3. The following gives a brief explanation of each over-arching stage and links to the pages dedicated to each construction stage.

Green roofs, blue roofs, and rainwater harvesting systems' have specific construction requirements. One day we will write guidance for these LID practices as well

Pre-construction[edit]

Pre-construction activities set the stage for the successful construction of an LID practice. The pre-construction page gives guidance on:

  • design verification and site walk-through
  • LID construction notes
  • tendering and contract
  • communication, inspection plan, and utilities coordination
  • erosion and sediment control measures
  • mobilization, access, staging, and perimeter controls

Excavation and grading[edit]

Excavation and grading are necessary for installing LID practices with sub-surface components, re-grading land to hold more water, and re-routing overland flow routes into an LID practice. The excavation and grading page gives guidance on:

  • clearing and grubbing
  • excavation and rough grade
  • final excavated grade and verification

Sub-surface components[edit]

Many LID practices rely on sub-surface features--gravel storage reservoirs, liners, underdrains, monitoring wells, etc.--to function. The construction process for sub-surface components works from the ground up. While some LID practices include all the sub-surface components listed below, most designs will not include one or more of these layers. Also, permeable pavement types can have different construction requirements at this stage, mostly regarding compaction of sub-surface layers.

The backfill granular, utilities, and pipes / sub-surface components page gives guidance on:

  • geotextile
  • underdrain
  • impermeable liners
  • overflow
  • monitoring wells
  • storage reservoir
    • sub-base reservoir (permeable pavements)
    • base course (permeable pavements)
  • stone choker layer
  • curbing
  • pre-treatment and inlet

Finishing grades and surface layer installation[edit]

This construction stage differs between LID practice type. The finishing grades and surface layer installation page has guidance for vegetated LIDS (bioretention, bioswales, enhanced grass swales, and vegetated filter strips; can also include infiltration chambers/trenches/soakaways, depending on the design) and permeable pavements.

  • soil media installation and soil amendment
  • finish grading
  • large stone and riprap
  • plant verification and installation
  • mulch placement
  • stabilizing contributing drainage area and planting adjacent vegetation
  • as-built survey
Stage 4 guidance for vegetated LIDs and permeable pavements
LID practices with vegetated surfaces Permeable pavements
*geotextile (if applicable) PP
*underdrain PP
*impermeable liners PP
*overflow PP
*monitoring wells pp
*storage reservoir PP
stone choker layer PP
curbing PP
*pre-treatment and inlet


Post-construction[edit]

If you assume the works too early, u make an ass out of me.

LID practice pages[edit]

Each construction page listed below :)

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