2,216
edits
Changes
Jump to navigation
Jump to search
Line 25:
Line 25:
Key Design and Plan Review Considerations (view source)
Revision as of 20:27, 21 June 2022
, 1 year agono edit summary
The following table provides some examples of inspection and maintenance features that should be considered in the BMP process:
The following table provides some examples of inspection and maintenance features that should be considered in the BMP process:
{| class="wikitable" style="width: 1275px;"
|+'''I&M Features to be Considered in BMP Design Phase'''
|-
!<br>'''LID BMP Type'''
!<br>'''Description'''
|-
|rowspan="3"|'''Infiltration BMPs'''
|-
|For infiltration BMPs, [[Wells|monitoring wells]] that extend to the bottom and standpipes or manholes connected to [[underdrains|sub-drains]] that allow access for drainage performance verification through water level measurements and routine flushing of sediment from pipes.
|-
|For infiltration BMPs, [[underdrains|sub-drain pipes]] should be 200 mm in diameter and be connected to manholes, maintenance hatches or standpipes (for standpipes, it is best to use two (2) 45 degree couplings) to allow for inspection by closed circuit camera (i.e., push camera) and sediment removal by jet-vac equipment.
|-
|rowspan="3"|'''Vegetated BMPs'''
|-
|For vegetated BMPs, consideration should be given to what source of water will be drawn upon for irrigation during the establishment/warranty period, how it will be delivered to the BMP (e.g., is equipment with sufficient volume and pressure available?), and in some cases an irrigation system should be part of the BMP design (e.g., [[green roofs]]).
|-
|For vegetated BMPs in high pedestrian traffic areas, consider the need for walkways or stepping stones and barriers to help limit foot traffic to designated portions of the BMP, or discourage it altogether if it is causing [[vegetation]] [[Maintenance, Rehabilitation and Repair|maintenance issues]].
|-
|rowspan="2"|'''Underground Pretreatment or BMPs'''
|-
|For underground pretreatment devices or BMPs, the associated manholes or maintenance hatches should be close to a drivable surface/path that can support the heavy vehicles needed for sediment removal maintenance (e.g., hydrovac trucks) and consider installing a staff gauge or graduated measuring tape to allow sediment depth to be assessed visually from the ground surface, without having to enter the confined space.
|-
|rowspan="3"|'''[[Green Roofs]] and [[Blue roofs|Blue Roofs]]'''
|-
|Safe and efficient means of accessing and exiting a [[green roof]] or [[Blue roofs|blue roof]] site for installation, inspection and maintenance is a primary consideration as it will influence the time and effort required to transport tools, equipment and materials to and from the site.
|-
|For [[green roofs]] and [[Blue roofs|blue roofs]], tie-off points for ladders and personal fall protection safety equipment should be incorporated in the roof design for use by individuals performing inspection and maintenance work.
|-
|rowspan="4"|'''General Considerations'''
|-
|Lockable caps on [[wells|monitoring wells]] and sub-drain clean-out standpipes to prevent unauthorized access, tampering, or vandalism.
|-
|Features for taking the BMP off-line or draining stored water by gravity to improve ease of inspection and sediment removal maintenance tasks.
|-
|[[Inlets]] should be readily accessible from surface conveyances, catchbasins, manholes or access hatches to avoid the need for specialized equipment for inspection (e.g., closed circuit or remote controlled cameras).
|-
|}