edition 1.0 september 2016 - edmonton · as with the cim guide itself, this cim handbook is a...

LID Construction, Inspection and Maintenance Field Handbook I

Low Impact Development Construction, Inspection & Maintenance Field Handbook

Edition 1.0September 2016

LID Construction, Inspection and Maintenance Field Handbook i City of Edmonton

CONTENTSIntroduction ................................................................ 1Bioretention, Bioswale, Naturalized Drainage Way and Box Planter Facilities .......................................... 7

Visual inspection ................................................................... 9Contributing Drainage Area (CDA) ....................................................11

CDA-1: Free of Debris, Trash, Leaf Fall.......................................12CDA-2: No Sources of Sediment Present ....................................14

Pre-Treatment (PT) ..........................................................................17PT–1: Requiring Clean-out ..........................................................18PT–2: Structural Integrity .............................................................20

Inlet (I) ..............................................................................................23I–1: Inlet Flow Capture ................................................................24I–2: Inlet Obstruction ...................................................................26I–3: Inlet Erosion .........................................................................28I–4: Inlet Structural Integrity .........................................................30

Boundary Zone (BZ) .........................................................................33BZ-1: Facility Size Matches Design .............................................34BZ-2: Boundary Debris and/or Trash ...........................................36BZ-3: Boundary Side-Slope Erosion ............................................38BZ-4: Planter Box Structural Integrity .........................................40BZ-5: Facility Enclosure ...............................................................42

Bed and Vegetated Zone (BVZ) .......................................................45BVZ-1: Evidence Amended Soil Does Not Meet Design ............46BVZ-2: Bed Zone Debris and/or Trash.........................................48BVZ-3: Bed Zone Erosion, Bare Patches or Sinking ...................50BVZ-4: Bed Zone Sediment Accumulation .................................52BVZ-5: Grade Control Structures .................................................54BVZ-6: Riprap Conditions ............................................................56BVZ-7: Mulch Depth and Condition .............................................58BVZ-8: Plant Material Health .......................................................60

LID Construction, Inspection and Maintenance Field Handbook iiiii City of Edmonton

BVZ-9: Plant Material Density and Coverage ..............................62BVZ-10: Landscape Aesthetics ....................................................64BVZ-11: Weeds and/or Invasive Species .....................................66

Outlet Zone (OZ) ..............................................................................69OZ-1: Underdrain, Clean-outs, Overflows ...................................70OZ-2: Outlet Obstruction .............................................................72OZ-3: Outlet Structural Integrity ...................................................74

Facility Wide inspections ..................................................... 77Performance Inspection (PI) .............................................................79

PI-1: CDA matches design ...........................................................80PI-2: Flow is Directed to Inlet .......................................................82PI-3: Flow Distribution in Facility Bed ..........................................84PI-4: Ponding Depth ....................................................................86PI-5: Drawdown Time and Standing Water ..................................88

Winter Inspection (WI) ......................................................................91WI-1: CDA is Free of Sediment and Grit .....................................92WI-2: Facility is Not Being Used as Snow Storage .....................94WI-3: Facility Has Not Been Damaged by Plows .........................96WI-4: Flow Route to Facility is Clear ...........................................98

Permeable Pavement ............................................ 101Visual inspection ............................................................... 103

Contributing Drainage Area (CDA) ...................................................105CDA-1: Free of Debris, Trash, Leaf Fall ......................................106CDA-2: No Source of Sediment Present ....................................108

Surface (S) .......................................................................................111S-1: Uneven, Missing or Damaged Pavers .................................112S-2: Raveling, Cracks or Potholes ..............................................114S-3: Debris ...................................................................................116S-4: Sedimentation ......................................................................118S-5: Debris and/or Sediment in Paver Joints ..............................120S-6: Joint Aggregate Top-up ........................................................122S-7: Vegetation Coverage ...........................................................124S-8: Weeds ..................................................................................126

Performance Inspection (PI) .............................................................129PI-1: Standing Water and Infiltration ...........................................130

Facility Wide inspections .................................................... 133Winter Inspections (WI) ....................................................................135

WI-1: CDA is Free of Sediment and Grit ......................................136WI-2: Facility is Not Being Used as Snow Storage ......................138WI-3: Facility Has Not Been Damaged by Plows .........................140

Acknowledgements ............................................... 143References ............................................................ 145Appendix................................................................ 147

LID Construction, Inspection and Maintenance Field Handbook 1iv City of Edmonton

INTRODUCTION

LID Construction, Inspection and Maintenance Field Handbook 32 City of Edmonton

In support of its commitment to the use of green infrastructure, the City of Edmonton has prepared guidelines for design1 and for construction, inspection and long-term maintenance2 of Low Impact Development (LID) facilities. This LID Construction, Inspection and Maintenance (CIM) Handbook is intended as a companion to these guideline documents, providing illustrations of conditions that may be encountered and describing recommended actions to address unacceptable conditions. The target users of this Handbook are primarily inspectors (both those working for the City as well as for contractors and consultants) and other field personnel who are overseeing maintenance of LID facilities.

As with the CIM Guide, five LID facility types are covered in the CIM Handbook; these are:

1. Bioretention;2. Bioswale;3. Box planter (contained planter; flow-through planter; infiltration

planter; soil cell planter);4. Naturalized drainage way; and5. Permeable pavement (permeable asphalt; porous concrete;

interlocking paver units; open-celled grid filled with either gravel or grass and soil media).

Figure 2. Bioswale Inspection Zones

Figure 1. Bioretention Inspection Zones

1Low Impact Development Best Practices Design Guide v1.1 (2014) (the Design Guide). 2Low Impact Development Construction, Inspection & Maintenance Guide Edition 1.0 (2016) (the CIM Guide). Figure 3. Box Planter Inspection Zones


In this CIM Handbook, a series of inspection items related to the maintenance of LID facilities as described in Tables 10 and 11 of the CIM Guide are provided. Two pages of the Handbook are devoted to each item, providing the following information on Visual and Performance Winter Inspection:

• On the even numbered page:• A description of the inspection item• A table describing “correction triggers” and associated “recom-

mended actions” for four severity conditions (ranging from “pass” to “severe”)

• On the odd numbered page:• Photographs illustrating the four severity conditions

Many of the photographs reference specific locations in and around LID facilities. Figures 1 through 5 show these locations.

As with the CIM Guide itself, this CIM Handbook is a living document and will be updated as needed and as more experience is gained in LID installation.

The CIM Handbook was prepared in July 2016 by Urban Systems Ltd. Most of the photographs in the Handbook are of LID facilities installed in Edmonton: these photos were primarily taken by City staff with additional photographs by Urban Systems. Others are cited* as required.

Appropriate photos are still required in a number of sections. Any relevant photos are welcome and can be submitted to [email protected].

Comments and questions regarding the CIM Handbook should be directed to [email protected].

Figure 4. Naturalized Drainage Way Inspection Zones

Figure 5. Permeable Pavement Inspection Zones

*see References, page 145.


BIORETENTION, BIOSWALE, NATURALIZED DRAINAGE WAY AND BOX PLANTER FACILITIES


VISUAL INSPECTION


Contributing Drainage Area (CDA)

Description: Contributing Drainage Area (CDA): the catchment area generating runoff which is conveyed via overland flow, channels and/or pipes to the LID facility. This may include sidewalks, roads, parking lots, lawns etc. Typically found in all LID facilities. Critical inspection items in this zone are debris and sources of sediment.


Correction Trigger Recommended ActionPass No evidence of trash,

debris or leaf fall.• None.

Minor Some trash or debris. • Remove trash and debris.Moderate Noticeable trash or

debris that is affecting facility function.

• Remove trash and debris. • Empty trash cans.• Assess need and add

additional trash cans. • Clear leaves.• Prune trees.

Severe Trash and debris have negatively impacted or halted facility function.

• Evaluate CDA or sources that can be reduced.

• Evaluate if additional pre-treatment is needed.

• Increase inspection and maintenance frequency.

• Remove trash and debris. • Empty trash cans.• Assess need and add

additional trash cans. • Clear leaves.• Prune trees.

CDA-1: Free of Debris, Trash, Leaf Fall

Minor: Some trash or debris.

Severe: Trash and debris have negatively impacted or halted facility function.

Moderate: Noticeable trash or debris that is affecting facility function.

Pass: No evidence of trash, debris or leaf fall.


Correction Trigger Recommended ActionPass No sources of sediment

evident in drainage area.• None.

Minor Several bare patches in drainage area.

• Seed or sod bare patches and stabilize area on next maintenance round.

Moderate Considerable portion of drainage area is unstable or contains sediment.

• Remove any sediment in drainage area.

• Stabilize any bare patches.

Severe Considerable area of drainage area is unstable* OR Drainage area contains substantial amount of sediment (e.g. stockpile or winter grit).

• Remove sediment from drainage area and/or facility.

• Stabilize any bare patches or areas causing erosion.

CDA-2: No Sources of Sediment Present

Minor: Several bare patches in drainage area.

Severe: Considerable area of drainage area is unstable. OR Drainage area contains substantial amount of sediment (e.g. stockpile or winter grit).

Moderate: Considerable portion of drainage area is unstable or contains sediment.

Pass: No sources of sediment evident in drainage area.

* Unstable - area not treated in a manner to minimize erosion and sedimentation (i.e. full ground cover). Sediment may also come from impervious surfaces, especially in winter when sanding occurs.


Pre-Treatment (PT)

Description: Pre-Treatment (PT): the reduction of potential for pollutants to enter the LID facility. This may be sod, filter strip, riprap, a hardscaped forebay, etc. Typically found in bioretention, bioswale, and naturalized drainage way facilities. Critical inspection items for this zone are debris and sediment accumulation and structural integrity.


Correction Trigger Recommended ActionPass Free of sediment, trash

or debris.• None.

Minor Slight accumulation of sediment, trash or debris.

• Remove blockage.

Moderate Accumulation of sediment, trash or debris is reducing inlet capacity.

• Remove blockage.• Empty trash cans.• Add trash cans.• Clear leaves.• Prune trees.

Severe Accumulation of sediment, trash or debris has blocked inlet facility. ORFacility lacks pre-treatment and inlet is entirely clogged.

• Evaluate CDA or sources that can be reduced.


• Increase inspection and maintenance frequency.

• Remove blockage.• Empty trash cans.• Add trash cans.• Clear leaves. • Prune trees.

PT–1: Requiring Clean-out

Minor: Slight accumulation of sediment, trash or debris.

Severe: Accumulation of sediment, trash or debris has blocked inlet facility. ORFacility lacks pre-treatment and inlet is entirely clogged.

Moderate: Accumulation of sediment, trash or debris is reducing inlet capacity.

Pass: Free of sediment, trash or debris.


Correction Trigger Recommended ActionPass Concrete and/or

structure free of cracks, chips and other damage.

• None.

Minor Some isolated blemishes (cracks and chips) are present.

• Blemish repair.

Moderate Several isolated areas requiring full repair or replacement.

• Determine source of damage.

• Assess site during rain.• Repair damages such as

cracks or chips.Severe Major problems present

throughout facility, full repair or replacement needed.

• Determine source or damage.

• Develop repair strategy with design team (if necessary).

• Assess site during rain.• Repair or replace damages.

PT–2: Structural Integrity

Minor: Some isolated blemishes (cracks and chips) are present.

Severe: Major problems present throughout facility, full repair or replacement needed.

Moderate: Several isolated areas requiring full repair or replacement.

Pass: Concrete and/or structure free of cracks, chips and other damage.

Photo required, please submit to [email protected]



Inlet (I)

Description: Inlet (I): the location where the runoff enters the facility such as through a curb cut. Typically found in bioretention, bioswale, and box planter. Critical inspection items for this zone are flow capture (i.e. flow is not by-passing the inlet); inlet obstruction; inlet erosion (i.e. erosion at and downstream of the inlet); and structural integrity.


Correction Trigger Recommended ActionPass No evidence that flow is

by-passing inlet, runoff can easily enter facility.

• None.

Minor Some runoff is bypassing inlet, evidenced by sediment accumulation, dampness or staining at inlet.

• Record on inspection form and monitor in future inspections.

Moderate Flow is mostly by-passing inlet, evidenced by moderate sediment accumulation, dampness or staining at inlet or dehydrated plant material in facility.

• Assess and correct inlet flow capture via re-grading, lowering inlet, or re-shaping inlet.

Severe Flow is completely by-passing inlet, evidenced by severe sediment and debris accumulation, ponding and staining at inlet, and severely dehydrated plant material in facility.

• Assess and correct inlet flow capture via re-grading, lowering inlet, reshaping inlet, or replacing inlet.

I–1: Inlet Flow Capture

Minor: Some runoff is bypassing inlet, evidenced by sediment accumulation, dampness or staining at inlet.

Severe: Flow is completely by-passing inlet, evidenced by severe sediment and debris accumulation, ponding and staining at inlet, and severely dehydrated plant material in facility.

Moderate: Flow is mostly by-passing inlet, evidenced by moderate sediment accumulation, dampness or staining at inlet, or dehydrated plant material in facility.

Pass: No evidence that flow is by-passing inlet, runoff can easily enter facility.

*


Correction Trigger Recommended ActionPass Free of sediment, trash,

or debris.• None.

Minor Slight accumulation of sediment, trash, or debris (≤10% capacity reduction).

• Remove blockage.

Moderate Accumulation of sediment, trash, or debris has begun affecting drainage path of facility (10%-50% capacity reduction).

• Remove blockage.• Empty trash cans. • Add additional trash cans. • Clear leaves. • Prune trees.

Severe Accumulation of sediment, trash, or debris has blocked drainage path to facility (≥50% capacity reduction).

• Evaluate CDA for sources that can be reduced.

• Evaluate if additional pre-treatment needed.

• Increase inspection and maintenance frequency for area.

• Remove blockage.• Empty trash cans. • Add additional trash cans. • Clear leaves.• Prune trees.

I–2: Inlet Obstruction

Minor: Slight accumulation of sediment, trash, or debris (≤10% capacity reduction).

Severe: Accumulation of sediment, trash, or debris has blocked drainage path to facility (≥50% capacity reduction).

Moderate: Accumulation of sediment, trash, or debris has begun affecting drainage path of facility (10%-50% capacity reduction).

Pass: Free of sediment, trash, or debris.


Correction Trigger Recommended ActionPass No evidence of erosion

or channelization. • None.

Minor Erosion is minor, such as displacing mulch or small bare patches.

• Re-distribute and top up mulch or soil media.

Moderate Erosion is considerable, concentrated flows are evident (via gully formation and scour is occurring).


• Stabilize with fabric, matting, stone or other material as instructed by inspector.

Severe Inlet protection is ineffective, considerable scour has occurred and the design may be insufficient.


• Stabilize with fabric, matting, stone or other material as instructed by inspector.

• Potentially, regrade inlet, install flow spreaders and/or additional inlet protection.

I–3: Inlet Erosion

Minor: Erosion is minor, such as displacing mulch or small bare patches.

Severe: Inlet protection is ineffective, considerable scour has occurred and the design may be insufficient.

Moderate: Erosion is considerable, concentrated flows are evident (i.e. gully formation and scour is occurring).

Pass: No evidence of erosion or channelization.


Correction Trigger Recommended ActionPass Concrete free of cracks,

chips and other damage. • None.

Minor Some isolated blemishes (cracks and chips) are present.

• Blemish repair.

Moderate Several isolated areas requiring full repair or replacement.


• Assess site during rain. • Repair damages such as

cracks or chips. Severe Major problems present,

full repair or replacement needed.


• Assess site during rain. • Develop repair strategy with

design team (if necessary). • Repair or replace damages.

I–4: Inlet Structural Integrity(applicable to hardscaped inlet only)

Minor: Some isolated blemishes (cracks and chips) are present.

Severe: Major problems present, full repair or replacement needed.

Moderate: Several isolated areas requiring full repair or replacement.

Pass: Concrete free of cracks, chips and other damage.



Boundary Zone (BZ)

Description: Boundary Zone (BZ): this includes the outer boundary and side slopes of a facility. Typically found in bioretention, bioswale, and naturalized drainage way facilities. Critical inspection items for this zone are ensuring that the facility size matches design; trash and debris are not accumulating; and the side slopes are not eroding.


Correction Trigger Recommended ActionPass Facility surface area

matches design. • None.

Minor Facility surface area differs from design by 5-10%.

• Estimate percentage of deviation in surface area.

• Note if facility size has decreased or increased.

Moderate Facility surface area differs from design by 10-25%.



• Identify causes of change. • Remove or add plant

material. • Reinstate soil media and/or

mulch.• Install edging (if determined

necessary).Severe Facility surface area

differs from design by ≥25%.



• Identify causes of change. • Re-design facility perimeter

(if necessary).• Remove or add plant

material.• Re-instate facility soil media

and/or mulch to match design.

• Install edging (if determined necessary).

BZ-1: Facility Size Matches Design

Minor: Facility surface area differs from design by 5-10%.

Severe: Facility surface area differs from design by ≥25%.

Moderate: Facility surface area differs from design by 10-25%.

Pass: Facility surface areas matches design.

*



debris, or leaf fall.• None.

Minor Some trash or debris. • Remove trash and debris. Moderate Noticeable trash or

debris that is affecting facility function and aesthetic.

• Remove trash and debris.• Empty trash cans. • Add additional trash cans. • Clear leaves. • Prune trees.

Severe Trash and debris have negatively impacted or halted facility function and significantly decreased aesthetic.





BZ-2: Boundary Debris and/or Trash(applicable to bioretention, bioswale, and naturalized drainage way facilities)


Severe: Trash and debris have negatively impacted or halted facility function and significantly decreased aesthetic.

Moderate: Noticeable trash or debris that is affecting facility function and aesthetic.

Pass: No evidence of trash, debris, or leaf fall.

*


Correction Trigger Recommended ActionPass No evidence of scour or

concentrated flows.• None.

Minor Erosion is minor, such as displacing mulch or small bare patches due to flow laterally entering facility.

• Re-distribute and top up mulch and/or soil media and reseed.

Moderate Erosion is considerate, concentrated flows are evident and deep gully formation is occurring in several locations in the facility.

• Re-distribute and top up mulch or soil media and reseed.

• Stabilize with fabric, matting, stone, or other material as instructed by inspector.

Severe Erosion is severe, concentrated flows are evident, and deep fully formation is occurring throughout the facility.

• Re-distribute and top up mulch or soil media and reseed.

• Stabilize with fabric, matting, stone, or other material as instructed by inspector.

• Re-grade side slopes; install flow spreaders and/or addition erosion protection.

BZ-3: Boundary Side-Slope Erosion(applicable only to bioretention, bioswale, and naturalized drainage way facilities)

Minor: Erosion is minor, such as displacing mulch or small bare patches due to flow laterally entering facility.

Severe: Erosion is severe, concentrated flows are evident, and deep fully formation is occurring throughout the facility.

Moderate: Erosion is considerate, concentrated flows are evident, and deep gully formation is occurring in several locations in the facility.

Pass: No evidence of scour or concentrated flows.


Correction Trigger Recommended ActionPass No damage to curbing

evident.• None.

Minor Minor damage (small isolated cracks and/or chips).

• Seal cracks in concrete.

Moderate Moderate damage (large cracks or chunks of concrete missing).

• Seal cracks in concrete.• Patch chips.• Replace section of

damaged curb.

Severe Severe deterioration affecting flow to facility (blocking flow or concentrating flow), safety, and aesthetics.

• Replace sections of damaged concrete.

• Adjust inlets (if necessary).• Adjust outlet elevation (if

necessary).

BZ-4: Planter Box Structural Integrity (applicable only to Box Planters)

Minor: Minor damage (small isolated cracks and/or chips).

Severe: Severe deterioration affecting flow to facility (blocking flow or concentrating flow), safety, and aesthetics.

Moderate: Moderate damage (large cracks or chunks of concrete missing).

Pass: No damage to curbing evident.



*


Correction Trigger Recommended ActionPass Enclosure is stable and

free from damage.• None.

Minor Enclosure is unstable in isolated locations.

• Repair enclosure.

Moderate Enclosure is unstable and/or vandalized throughout.


Severe Enclosure needs full replacement.

• Investigate cause of deterioration.


BZ-5: Facility Enclosure

Minor: Enclosure is unstable in isolated locations.

Severe: Enclosure needs full replacement.

Moderate: Enclosure is unstable and/or vandalized throughout.

Pass: Enclosure is stable and free from damage.


Bed and Vegetated Zone (BVZ)

Description: Bed and Vegetated Zone (BVZ): this includes the facility sides, bottom, and associated vegetation. Typically found in bioretention, bioswale, naturalized drainage way, and box planter facilities. Critical inspection items for this zone are amended soil specification verification; debris and/or trash; erosion; sedimentation; mulch depth and condition; plant material health; density and coverage present of weeds and/or invasive species; and riprap condition (if specified).


Correction Trigger Recommended ActionPass Soil texture has high

sand content.• None.

Minor Soil texture is sandy with some small clumps.

• Evaluate if clay content negatively impacts function.

• Monitor in future inspections.

Moderate Soil texture and appearance (cohesive when wet) indicates low sand content and higher clay content.

• Send soil sample for composition test.

• Perform infiltration test. • Install new soil or amend

current soil further.

Severe Soil texture is clearly high in clay (cohesive when formed into a ball) and slow to drain when wet.

• Send soil sample for composition test.

• Perform infiltration test. • Remove and replace with

new soil.

BVZ-1: Evidence Amended Soil Does Not Meet Design

Minor: Soil texture is sandy with some small clumps.

Severe: Soil texture is clearly high in clay (cohesive when formed into a ball) and slow to drain when wet.

Moderate: Soil texture and appearance (cohesive when wet) indicates low sand content and higher clay content.

Pass: Soil texture has high sand content.





debris that is affecting facility function and aesthetic.



Severe Trash and debris have negatively impacted or halted facility function and significantly decreased aesthetic.


• Evaluate if additional pre-treatment needed.


• Remove trash and debris.• Empty trash cans. • Add additional trash cans .• Clear leaves.• Prune trees.

BVZ-2: Bed Zone Debris and/or Trash


Severe: Trash and debris have negatively impacted or halted facility function and significantly decreased aesthetic.

Moderate: Noticeable trash or debris that is affecting facility function and aesthetic.



Correction Trigger Recommended ActionPass No evidence of erosion

or sinking.• None.

Minor Erosion is minor, such as displacing mulch or small bare patches. OR Isolated areas of sinking.

• Re-distribute and top up mulch and/or soil media and reseed (if specified).

Moderate Erosion is considerate, concentrated flows are evident, and deep gully formation is occurring in several locations in the facility. OR Evidence of moderate localized sinking at pre-treatment structure, inlet, outlet, or overflow.

• Re-distribute and top up mulch or soil media and reseed (if specified).

• Correct preferential flow path by raking or backfilling, install/repair underdrain in the case of sinking.

Severe Erosion is severe, concentrated flows are evident, and deep gully formation is occurring throughout the facility. OR Severe sinking occurring at any location in facility.

• Re-distribute and top up mulch or soil media and reseed (if specified).

• Correct preferential flow path by raking or backfilling, install/repair underdrain in the case of sinking.

• Install additional flow spreaders at inlet or along flow path.

BVZ-3: Bed Zone Erosion, Bare Patches or Sinking

Minor: Erosion is minor, such as displacing mulch or small bare patches. OR Isolated areas of sinking.

Severe: Erosion is severe, concentrated flows are evident, and deep gully formation is occurring throughout the facility. OR Severe sinking occurring at any location in facility.

Moderate: Erosion is considerable, concentrated flows evident, several deep gully formations occurring. OR Evidence of moderate localized sinking at pre-treatment structure, inlet, outlet, or overflow.

Pass: No evidence of erosion or sinking.


Correction Trigger Recommended ActionPass Facility is free of

sediment and caking.• None.

Minor Sediment caking is thin and isolated to inlet.

• Remove as much sediment as possible and rake in what remains. Reseed (if specified).

Moderate Sediment caking is thin but affects majority of facility.

• Remove as much sediment as possible and rake in what remains. Reseed (if specified).

• Clean out pre-treatment device.

Severe Sediment caking is severe, affects majority of facility, and is likely reducing facility infiltration.

• Remove top 150 mm of amended soil media and replace with approved new batch. Reseed (if specified).

• Clean out pre-treatment device.

• Stabilize CDA and/or remove sources of sediment from CDA.

BVZ-4: Bed Zone Sediment Accumulation

Minor: Sediment caking is thin and isolated to inlet.

Severe: Sediment caking is severe, affects majority of facility, and is likely reducing facility infiltration.

Moderate: Sediment caking is thin but affects majority of facility.

Pass: Facility is free of sediment and caking.


Correction Trigger Recommended ActionPass No evidence of structural

damage and/or improper function.

• None.

Minor Minor structural damage and/or minor deviation from design flow, evidenced by oversaturated or dehydrated conditions.

• Mark on inspection form and monitor in future inspections.

Moderate Moderate structural damage and/or flows deviating from design evidenced by non-distributed storage, dehydrated vegetation, and/or downstream erosion due to higher than expected flows.

• Consider increased inspections and maintenance frequency.

• Repair grade control structure.

• Repair damage caused by erosion.

Severe Severe structural damage and/or flows completely deviating from design evidenced by non-distributed storage and/or facility flooding, extremely dehydrated vegetation, and/or severe downstream erosion due to higher than expected flows.


• Repair grade control structure.

• Repair damage caused by erosion.

BVZ-5: Grade Control Structures

Minor: Minor structural damage and/or minor deviation from design flow, evidenced by oversaturated and/or dehydrated conditions.

Severe: Severe structural damage and/or flows deviating from design evidenced by non-distributed storage, facility flooding, extreme dehydrated vegetation, and/or severe downstream erosion due to high flows.

Moderate: Moderate structural damage and/or flows deviating from design evidenced by non-distributed storage, dehydrated vegetation, and/or downstream erosion due to higher than expected flows.

Pass: No evidence of structural damage and/or improper function.


*


Correction Trigger Recommended ActionPass Riprap is functioning

effectively. • None.

Minor Riprap is slightly ineffective. Signs of erosion or soil accumulation, some dislodged or unstable rocks.


• Repair erosion.• Remove accumulated soil.• Replace dislodged rocks.• Stabilize unstable sections.

Moderate Riprap is significantly dislodged or unstable. Moderate erosion or sediment accumulation is occurring.

• Evaluate riprap design for effectiveness.


• Repair erosion.• Remove accumulated soil.• Replace dislodged rocks.• Stabilize unstable sections.

Severe Riprap is ineffective. Majority of rocks are dislodged or unstable. Significant erosion or sediment accumulation is occurring.

• Repair erosion. • Remove accumulated soil.• Re-grade riprap.• Replace dislodged rocks.• Remove and replace rock.• Stabilize unstable sections.• Re-grade CDA.• Install new erosion

protection BMP.

BVZ-6: Riprap Conditions

Minor: Riprap is slightly ineffective. Signs of erosion or soil accumulation, some dislodged or unstable rocks.

Severe: Riprap is ineffective. Majority of rocks are dislodged or unstable. Significant erosion or sediment accumulation is occurring.

Moderate: Riprap is significantly dislodged or unstable. Moderate erosion or sediment accumulation is occurring.

Pass: Riprap is functioning effectively.

*

*


Correction Trigger Recommended ActionPass Mulch depth of 75-

100mm and ≥80% ground cover.

• None.

Minor Less than 75mm depth mulch and <80% groundcover.

• Top up or remove mulch to designed depth and 100% coverage.

Moderate More than 100mm of mulch causing blockages. OR Sparse mulch coverage.

• Investigate reason for mulch discrepancy (e.g. staff not familiar with standard practice).


Severe More than 150mm of mulch causing major blockages. OR No mulch coverage.

• Investigate reason for mulch discrepancy (e.g. staff not familiar with standard practice, facility undersized for storm event).


BVZ-7: Mulch Depth and Condition(if specified)

Minor: Less than 75mm depth mulch and <80% groundcover.

Severe: More than 150mm of mulch causing major blockages. OR No mulch coverage.

Moderate: More than 100mm of mulch causing blockages. OR Sparse mulch coverage.

Pass: Mulch depth of 75-100mm and ≥80% ground cover.


Correction Trigger Recommended ActionPass Over 80% plant material

thriving.• None.

Minor Over 20% of plant material shows signs of dehydration or disease.

• Treat diseased vegetation.• Water where needed.• Monitor in future

inspections. Moderate 30-60% of plant

material shows signs of dehydration or disease.


• Treat diseased vegetation.• Water where needed.• Re-plant as directed.

Severe Over 60% of plant material shows signs of dehydration or disease.

• Assess planting to ensure species are appropriate for facility.

• Test amended soil media.• Re-design according to

assessment.• Remove and replant entire

facility (if necessary).

BVZ-8: Plant Material Health

Minor: Over 20% of plant material shows signs of dehydration or disease.

Severe: Over 60% of plant material shows signs of dehydration or disease.

Moderate: 30-60% of plant material shows signs of dehydration or disease.

Pass: Over 80% plant material thriving.


Correction Trigger Recommended ActionPass Over 80% vegetative

coverage.• None.

Minor Less than 80% coverage (bare patches).

• Fill in bare areas with either plant material on site or new plantings.

• Water where needed.• Reseed bare patches of

turf.Moderate Less than 50%

coverage.• Fill in bare areas with either

plant material on site or new plantings.

• Treat diseased plants.• Water where needed.• Reseed bare patches of

turf.

Severe Less than 25% coverage.

• Fill in bare areas with recommended plant material.

• Treat diseased plants.• Water where needed.• Reseed bare patches of

turf.• Remove and replant entire

facility (if necessary).

BVZ-9: Plant Material Density and Coverage

Minor: Less than 80% coverage (bare patches).

Severe: Less than 25% coverage.

Moderate: Less than 50% coverage.

Pass: Over 80% vegetative coverage.


Correction Trigger Recommended ActionPass Noticeably maintained

and meets design intent and aesthetics.

• None.

Minor Plant coverage not as dense as intended.

• Plant bare areas.

Moderate Plant material is taking over facility. OR Facility is sparsely covered.

• Plant bare areas or replace species.

Severe Plant material has taken over facility. OR Facility is bare.

• Plant bare areas or replace species.

BVZ-10: Landscape Aesthetics

Minor: Plant coverage not as dense as intended.

Severe: Plant material has taken over facility. OR Facility is bare.

Moderate: Plant material is taking over facility. OR Facility is sparsely covered.

Pass: Noticeably maintained and meets aesthetics desired.


Correction Trigger Recommended ActionPass No weeds are evident. • None.Minor Weeds are starting to

become noticeable.• Weed where needed.• Re-mulch as required.

Moderate Weeds are starting to take over.

• Assess weeding schedule.• Monitor in future

inspections.• Weed where needed.

Severe Less than 25% coverage by desired plant material.

• Evaluate surrounding area for source of weeds.

• Assess weeding schedule.• Weed where needed.

BVZ-11: Weeds and/or Invasive Species

Minor: Weeds are starting to become noticeable.

Severe: Less than 25% coverage by desired plant material.

Moderate: Weeds are starting to take over.

Pass: No weeds are evident.


Outlet Zone (OZ)

Description: Outlet Zone (OZ): this includes the spill overflow; overflow outlet drain; and an underdrain (if specified). Typically found in bioretention, bioswale, naturalized drainage way, and box planter facilities. Critical inspection items for this zone are outlet obstruction; outlet structural damage; and pipe condition and/or loss of capacity.


Correction Trigger Recommended ActionPass Free of sediment, debris,

sags, damage, and cleanout caps present.

• None.

Minor Minimal loss of outlet capacity or cleanout caps damaged or not present.

• Monitor on next inspection.• Flush pipe.• Remove debris from

overflow.• Replace cleanout cap.

Moderate Major loss of outlet capacity.

• Investigate cause of obstruction.

• Flush pipe.• Remove debris from

overflow.Severe Outlet or pipe completely

blocked, has sagged, or is damaged and requiring repair.

• Investigate cause of the obstruction or damage.

• Flush, repair, or replace pipe.

• Remove debris from overflow.

OZ-1: Underdrain, Clean-outs, Overflows

Minor: Minimal loss of outlet capacity or cleanout caps damaged or not present.

Severe: Outlet or pipe completely blocked, has sagged, or is damaged and requiring repair.

Moderate: Major loss of outlet capacity.

Pass: Free of sediment, debris, sags, damage, and cleanout caps present.


*


Correction Trigger Recommended ActionPass No evidence of

obstruction.• None.

Minor Partially blocked but flow can still enter.

• Clear debris.

Moderate Outlet is blocked but still visible.

• Evaluate cause of accumulation.

• Clear debris.Severe Outlet is blocked and

not visible. Flow cannot enter.

• Evaluate cause of accumulation, such as maintenance frequency or frequent mulch application.

• Clear debris.

OZ-2: Outlet Obstruction

Minor: Partially blocked but flow can still enter.

Severe: Outlet is blocked and not visible. Flow cannot enter.

Moderate: Outlet is blocked but still visible.

Pass: No evidence of obstruction.


Correction Trigger Recommended ActionPass Outlet is present and

undamaged. • None.

Minor Partially damaged but functional.

• Repair or replace outlet.

Moderate Outlet is damaged and requires full repair or replacement.

• Investigate source of damage.

• Repair or replace outlet.Severe Outlet is missing and

requires replacement.• Investigate source of

damage.• Repair or replace outlet.

OZ-3: Outlet Structural Integrity

Minor: Partially damaged but functional.

Severe: Outlet is missing and requires replacement.

Moderate: Outlet is damaged and requires full repair or replacement.

Pass: Outlet is present and undamaged.



FACILITY WIDE INSPECTIONS


Performance Inspection (PI)

Description: Performance Inspection (PI): this is the entire facility’s overall performance.


Correction Trigger Recommended ActionPass Size and shape matches

design.• None.

Minor 5-10% discrepancy. • Note and monitor on future inspections.

Moderate 10-25% discrepancy. • Investigate cause of discrepancy.

• Consult design team to ensure facility function is not compromised.

Severe >25% discrepancy. • Investigate cause of discrepancy.

• Consult design team to ensure facility function is not compromised.

• Adjust drainage area via re-grading.

PI-1: CDA Matches Design

Minor: 5-10% discrepancy.

Severe: >25% discrepancy.

Moderate: 10-25% discrepancy.

Pass: Size and shape matches design.


Correction Trigger Recommended ActionPass Water easily enters

facility.• None.

Minor Slight by-pass (25% of flow bypasses).


Moderate Moderate by-pass occurring (50% of flow bypasses).

• Evaluate cause of bypass.• Re-grade drainage area.

Severe Complete by-pass (100% of flow bypasses).

• Evaluate cause of bypass.• Re-grade drainage area

and/or install new inlet structure and replace all surface materials.

PI-2: Flow is Directed to Inlet(not applicable to Naturalized Drainage Way)

Minor: Slight by-pass (25% of flow bypasses).

Severe: Complete by-pass (100% of flow bypasses).

Moderate: Moderate by-pass occurring (50% of flow bypasses).

Pass: Water easily enters facility.


Correction Trigger Recommended ActionPass Even distribution. • None.Minor ≥75% of facility receiving

flow.• Rake mulch to evenly

distribute. Reseed if specified.

Moderate Preferential path with ≤50% of facility receiving flow.

• Assess cause of preferential path (such as mulch movement).

• Remove mulch, re-grade soil media, and replace mulch. And/or reseed if specified.

Severe Preferential path with ≤25% of facility receiving flow.

• Assess cause of preferential path (such as mulch movement).

• Remove mulch, re-grade soil media, and replace mulch. And/or reseed if specified.

PI-3: Flow Distribution in Facility Bed

Minor: ≥75% of facility receiving flow.

Severe: Preferential path with ≤25% of facility receiving flow.

Moderate: Preferential path with ≤50% of facility receiving flow.

Pass: Even distribution.


Correction Trigger Recommended ActionPass Ponding depth matches

design.• None.

Minor 10% discrepancy. • Note on inspection form and monitor plant health (dehydration or over water).

Moderate 25% discrepancy. • Assess cause of discrepancy (such as mulch depth).

• Add/or remove mulch and rake.

Severe 50%+ discrepancy. • Assess cause of discrepancy (such as mulch depth, amended soil settlement, outlet elevation).

• Correct facility depth based on recommendation of inspector.

PI-4: Ponding Depth

Minor: 10% discrepancy.

Severe: 50%+ discrepancy.

Moderate: 25% discrepancy.

Pass: Ponding depth matches design.


Correction Trigger Recommended ActionPass No evidence of standing

water.• None.

Minor Saturated soils exceeding design drawdown time.

• Note on inspection form and monitor in future visits.

Moderate Isolated areas of ponding exceeding design drawdown time.

• Increase inspection frequency.

• Evaluate facility ponding depth and longitudinal slope vs. design.

• Take soil sample.• CCTV weeping tile.• Adjust mulch or soil media

as directed by inspector. • Reseed if specified.

Severe Facility-wide ponding exceeding design drawdown time.

• Increase inspection frequency.

• Evaluate facility ponding depth vs. design.

• Take soil sample.• Perform infiltration test.• CCTV weeping tile.• Adjust mulch or soil media

as directed by inspector.• Reseed if specified.• Pump out facility.

PI-5: Drawdown Time and Standing Water

Minor: Saturated soils exceeding design drawdown time.

Severe: Facility-wide ponding exceeding design drawdown time.

Moderate: Isolated areas of ponding exceeding design drawdown time.

Pass: No evidence of standing water.


Winter Inspection (WI)

Description: Winter Inspection (WI): this includes the effects the winter season and winter activities have on facilities. Critical inspection items include accumulation of sedimentation, designated snow areas, plow protection, and unobstructed flow routes.


Correction Trigger Recommended ActionPass No evidence of sediment

and grit.• None.

Minor Some isolated areas of sediment and grit.

• Remove sediment and grit.

Moderate Noticeable coverage of >50% of drainage area.

• Remove sediment and grit.• Install temporary ESC.

Severe Entire drainage area covered by sediment and grit.

• Remove sediment and grit.• Install temporary ESC.• Clean pre-treatment device.

WI-1: CDA is Free of Sediment and Grit

Minor: Some isolated areas of sediment and grit.

Severe: Entire drainage area covered by sediment and grit.

Moderate: Noticeable coverage of >50% of drainage area.

Pass: No evidence of sediment and grit.



*


Correction Trigger Recommended ActionPass No snow is stored on

facility.• None.

Minor Snow storage on ≤25% of facility.

• Note on inspection form and discuss with Transportation group.

Moderate Snow storage on ≤50% of facility.

• Discuss with Transportation group.

• Use alternative snow storage location for future snowfalls.

Severe Snow storage on ≥75% of facility.


• Have snow removed from facility (if alternative location is available and removal will not damage facility).

• Use alternative snow storage location for future snowfalls.

WI-2: Facility is Not Being Used as Snow Storage

Minor: Snow storage on ≤25% of facility.

Severe: Snow storage on ≥75% of facility.

Moderate: Snow storage on ≤50% of facility.

Pass: No snow is stored on facility.


Correction Trigger Recommended ActionPass No plow damage

evident.• None.

Minor Isolated minor damage present.

• Note on inspection form and re-inspect in the spring.

Moderate Damage evident throughout facility, to hard infrastructure or plant material.

• Note on inspection form.• Install high visibility flagging

(or approved alternate to bring attention to area).

• Re-evaluate in the spring.• Repair damages in the

spring.Severe Major damage is present

that needs immediate repair.

• Note on inspection form.• Remove damaged material

immediately.• Install high visibility flagging


• Repair damages immediately.

• Re-evaluate in the spring.

WI-3: Facility Has Not Been Damaged by Plows

Minor: Isolated minor damage present.

Severe: Major damage is present that needs immediate repair.

Moderate: Damage evident throughout facility, to hard infrastructure or plant material.

Pass: No plow damage evident.






Correction Trigger Recommended ActionPass Water easily enters

facility.• None.

Minor Slight by-pass (25% of flow bypasses).


Moderate Moderate by-pass occurring (50% of flow bypasses).

• Create flow path to facility inlet.

Severe Complete by-pass (100% of flow bypasses).

• Create flow path to facility inlet.

WI-4: Flow Route to Facility is Clear

Minor: Slight by-pass (25% of flow bypasses).

Severe: Complete by-pass (100% of flow bypasses).

Moderate: Moderate by-pass occurring (50% of flow bypasses).

Pass: Water easily enters facility.



PERMEABLE PAVEMENT


VISUAL INSPECTION


Contributing Drainage Area (CDA)

Description: Contributing Drainage Area (CDA): this is the catchment area for the facility. This may include sidewalks, roads, parking lots, lawn, etc. Critical inspection items in this zone are debris and sources of sediment.





debris that is affecting facility function.


• Remove trash and debris.• Empty nearby trash cans.• Add additional trash cans.• Clear leaves.


• Evaluate CDA for sources that can be reduced and evaluate if additional pre-treatment is needed.


• Remove trash and debris.• Empty nearby trash cans.• Add additional trash cans.• Clear leaves.

CDA-1: Free of Debris, Trash, Leaf Fall






Correction Trigger Recommended ActionPass No sources of sediment

evident in drainage area.• None.

Minor Several bare patches in drainage area.

• Stabilize area on next trip.

Moderate Considerable amount of drainage area is unstable or contains sediment.

• Remove sediment and stabilize area.

Severe Considerable area of drainage area is unstable or drainage area contains large amount of sediment (e.g. stockpile or winter grit).

• Review facility for sedimentation.

• Review drainage area for sources of erosion.

• Remove sediment from drainage area and/or facility.

• Stabilize any bare patches or areas causing erosion.

CDA-2: No Source of Sediment Present

Minor: Several bare patches in drainage area.

Severe: Considerable area of drainage area is unstable or drainage area contains large amount of sediment (e.g. stockpile or winter grit).

Moderate: Considerable amount of drainage area is unstable or contains sediment.

Pass: No sources of sediment evident in drainage area.


Surface (S)

Description: Surface (S): this is the entire pavement or paver surface.


Correction Trigger Recommended ActionPass Smooth, even surface

with no missing pavers.• None.

Minor Some uneven sections or isolated areas of missing pavers.

• Replace missing paver(s).

Moderate Surface is uneven and acts as a trip hazard or large portions of pavers missing.

• Remove pavers, re-distribute bedding, and re-install pavers (may need to break pavers to remove).

• Replace missing paver(s).

Severe Surface is unacceptable to be traveled on or is missing a large section of paver units.

• Remove pavers, re-distribute bedding, and re-install pavers (may need to break pavers to remove).

• Replace missing paver(s).• Remove and replace

pavers if needed.

S-1: Uneven, Missing or Damaged Pavers only applicable to permeable unit pavers and open grid pavers)

Minor: Some uneven sections or isolated areas of missing pavers.

Severe: Surface is unacceptable to be traveled on or is missing a large section of paver units.

Moderate: Surface is uneven and acts as a trip hazard or large portions of pavers missing.

Pass: Smooth, even surface with no missing pavers.


Correction Trigger Recommended ActionPass No signs of pavement

degradation. • None.

Minor Slight segregation or small crack in isolated area.

• Note blemish in inspection report and monitor in the future.

Moderate Moderate segregation with some loose aggregate in isolated area. OR Widespread minor segregation and cracking (≤10% pavement surface).

• Patch and seal degraded areas with conventional asphalt or concrete mix.

Severe Severe segregation with some loose aggregate. OR Widespread minor segregation and cracking (>10% pavement surface).

• Patch and seal degraded areas with conventional asphalt or concrete mix.

• Remove pavement down to bedding or base course and replace.

S-2: Raveling, Cracks or Potholes (only applicable to porous asphalt and porous concrete)

Minor: Slight segregation or small crack in isolated area.

Severe: Severe segregation with some loose aggregate. OR Widespread minor segregation and cracking (>10% pavement surface).

Moderate: Moderate segregation with some loose aggregate in isolated area. OR Widespread minor segregation and cracking (≤10% pavement surface).

Pass: No signs of pavement degradation.





Minor Some trash or debris. • Remove trash and debris (may require vacuum operation).

Moderate Noticeable trash or debris that is affecting facility function.

• Remove trash and debris.• Empty nearby trash cans.• Clear leaves.


• Assess maintenance frequency.

• Evaluate CDA.• Remove trash and debris.• Empty trash cans.• Add additional trash cans.• Clear leaves.• Prune trees (high skill).

S-3: Debris






Correction Trigger Recommended ActionPass Facility is free of

sediment.• None.

Minor Sediment affects <10% of facility area and has not been washed into pavement.

• Vacuum with regenerative air sweeper.

Moderate Sediment affects <25% of the facility and/or has been washed into pavement.


• Power wash on low pressure setting.

Severe Sediment coverage >80%.

• Vacuum with true air sweeper.


• Replace joint aggregate, if applicable.

• Stabilize contributing drainage area and/or remove sources of sediment.

S-4: Sedimentation

Minor: Sediment affects <10% of facility area and has not been washed into pavement.

Severe: Sediment coverage >80%.

Moderate: Sediment affects <25% of the facility and/or has been washed into pavement.

Pass: Facility is free of sediment.


Correction Trigger Recommended ActionPass No sediment or debris

present.• None.

Minor <10% of joints have debris or sediment visible.


Moderate >50% of joint area has dry non-compacted debris.

• Assess maintenance frequency.



Severe >50% of joint area has compacted debris and sediment caking.



• Replace joint aggregate, if applicable.

• Stabilize contributing drainage area and/or remove sources of sediment.

S-5: Debris and/or Sediment in Paver Joints (only applicable to permeable unit pavers and open grid pavers)

Minor: <10% of joints have debris or sediment visible.

Severe: >50% of joint area has compacted debris and sediment caking.

Moderate: >50% of joint area has dry non-compacted debris.

Pass: No sediment or debris present.


Correction Trigger Recommended ActionPass Joint aggregate is filled

to lip of paver.• None.

Minor N/A.Moderate N/A.Severe Joint aggregate has

settled below lip of paver.

• Top-up aggregate with aggregate matching design and sweep into joints.

S-6: Joint Aggregate Top-up

Minor: N/A.

Severe: Joint aggregate has settled below lip of paver.

Moderate: N/A.

Pass: Joint aggregate is filled to lip of paver.

No Image Required

No Image Required


Correction Trigger Recommended ActionPass 100% coverage. • None.Minor 75% coverage. • Top dress and seed bare

and sparsely established areas.

• Water where needed.Moderate 50% coverage. • Assess soils to ensure they

are meeting design/City standards.

• Overseed entire facility.• Water where needed.

Severe ≤25% coverage. • Assess soils to ensure they are meeting design/City standards.

• Assess seed species to ensure they are suitable for the site.

• Remove and reseed entire facility.

S-7: Vegetation Coverage (applicable to turf filling unit pavers)

Minor: 75% coverage.

Severe: ≤25% coverage.

Moderate: 50% coverage.

Pass: 100% coverage.


Correction Trigger Recommended ActionPass No weeds are evident. • None.Minor Weeds are starting to

become noticeable.• Weed where needed.

Moderate Weeds are starting to take over.

• Assess weeding schedule. • Weed where needed.

Severe Less than 50% turf coverage.

• Evaluate surrounding area for source of weed aggression.

• Assess weeding schedule. • Weed where needed.

S-8: Weeds (applicable to turf filled unit pavers)

Minor: Weeds are starting to become noticeable.

Severe: Less than 50% turf coverage.

Moderate: Weeds are starting to take over.

Pass: No weeds are evident.

All weeds are to be hand picked and weeds must be controlled as per the Weed Act. Herbicides are toxic to aquatic ecosystems and should only be used if all other options have been implemented without success and the City has approved the use.


Performance Inspection (PI)

Description: Performance Inspection (PI): this is the entire facility’s overall performance.


Correction Trigger Recommended ActionPass No evidence of water on

surface or in standpipe 72hrs after a rainfall event.

• None.

Minor Localized patched of standing water on <10% of facility surface.


• Monitor in future inspections. Moderate Localized patched

of standing water on <25% of facility surface or water present in standpipe 72hrs after rainfall event.

• If ponding is isolated, instruct maintenance team to remove and replace pavers.

• Assess downstream drainage infrastructure for cause of water present in standpipe.


• Remove and replace unit pavers and replace joint aggregate.

• Clean downstream drainage infrastructure.

Severe Large area of ponding water on surface or water present in standpipe 72hrs after rainfall event.

• Clean and obtain CCTV footage of underdrain, assess for causes of failure.


• Remove and replace unit pavers and replace joint aggregate.

PI-1: Standing Water and Infiltration

Minor: Localized patched of standing water on <10% of facility surface.

Severe: Large area of ponding water on surface or water present in standpipe 72hrs after rainfall event.

Moderate: Localized patched of standing water on <25% of facility surface or water present in standpipe 72hrs after rainfall event.

Pass: No evidence of water on surface or in standpipe 72hrs after a rainfall event.


FACILITY WIDE INSPECTIONS


Winter Inspections (WI)

Description: Winter Inspection (WI): this includes the effects winter season and winter activities have on facilities. Critical inspection items include accumulation of sedimentation, designated snow areas, plow protection, and unobstructed flow routes.


Correction Trigger Recommended ActionPass No evidence of

sediment. • None.

Minor Some isolated areas of sediment and grit.

• Remove sediment and grit.

Moderate Noticeable coverage of >50% of drainage area.

• Remove sediment and grit.• Install temporary ESC.

Severe Entire drainage area covered by sediment and grit.

• Remove sediment and grit.• Install temporary ESC.• Clean pre-treatment device.

WI-1: CDA is Free of Sediment and Grit

Minor: Some isolated areas of sediment and grit.

Severe: Entire drainage area covered by sediment and grit.

Moderate: Noticeable coverage of >50% of drainage area.

Pass: No evidence of sediment.




Correction Trigger Recommended ActionPass No snow is stored on

facility. • None.

Minor Snow storage on ≤25% of facility.

• Note on inspection form and discuss with Transportation.

Moderate Snow storage on ≤50% of facility.

• Evaluate alternate snow storage locations.


• Use alternate snow storage location.

Severe Snow storage on ≥75% of facility.


• Have snow removed from facility (if alternative location is available and removal will not damage facility).

• Use alternative snow storage location.

WI-2: Facility is Not Being Used as Snow Storage

Minor: Snow storage on ≤25% of facility.

Severe: Snow storage on ≥75% of facility.

Moderate: Snow storage on ≤50% of facility.

Pass: No snow is stored on facility.






Correction Trigger Recommended ActionPass No plow damage

evident. • None.

Minor Isolated minor damage present.

• Note on inspection form and re-inspect in the spring.

Moderate Damage evident throughout facility (to hard infrastructure or plant material).

• Discuss with Transportation. • Install high visibility flagging


• Repair damage in the spring.

Severe Major damage is present that needs immediate repair.

• Discuss with Transportation.• Remove damaged material.• Install high visibility flagging


• Repair damage in the spring.

WI-3: Facility Has Not Been Damaged by Plows

Minor: Isolated minor damage present.

Severe: Major damage is present that needs immediate repair.

Moderate: Damage evident throughout facility (to hard infrastructure or plant material).

Pass: No plow damage evident.






ACKNOWLEDGEMENTS


Additional photographs were graciously provided by New York State Stormwater and McElhanney Consulting Services Ltd; the City thanks these contributing parties for their help in completing this Handbook.

REFERENCES


BZ-1 Facility Site Matches Design - Pass: 16869571360_9d0ca50ee4_o, NYS Stormwater. Online Image. Flickr. 10 July 2016 <https://www.flickr.com/photos/131402048@N04/albums>

BZ-2 Boundary Debris and/or Trash - Minor: Picture may 19 003, McElhanney Consulting Services Ltd

BZ-4 Planter Box Structural Integrity - Pass: Picture may 19 003, McElhanney Consulting Services Ltd

BVZ-5 Grade Control Structures - Minor: IMG_3486, McElhanney Consulting Services Ltd

BVZ-6 Riprap Condition - Moderate: 21413158674_8355378712_o, NYS Stormwater. Online Image. Flickr. 10 July 2016 <https://www.flickr.com/photos/131402048@N04/albums>

BVZ-6 Riprap Condition - Severe: 16870530359_e9fc36e09f_o, NYS Stormwater. Online Image. Flickr. 10 July 2016 <https://www.flickr.com/photos/131402048@N04/albums>

OZ-1 Underdrains, Clean-outs, Overflows - Minor: IMG_1211, McElhanney Consulting Services Ltd

WI-1 CDA is Free of Sediment and Grit - Pass: 121102 019, McElhanney Consulting Services Ltd APPENDIX

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