Level 1 Maintenance Practicum Maintenance is Needed for Regulatory - - PowerPoint PPT Presentation

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Level 1 Maintenance Practicum Maintenance is Needed for Regulatory - - PowerPoint PPT Presentation

Jul 06, 2023 393 likes •945 views

Level 1 Maintenance Practicum Maintenance is Needed for Regulatory Compliance & Credit! Vegetation will be the main driver for public response , is a main indicator of success or failure of a practice, and the Key to Performance

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Level 1 Maintenance Practicum

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Maintenance is Needed for Regulatory Compliance & Credit!

“Vegetation will be the main driver for public response, is a main indicator of success

  • r failure of a practice,

and the Key to Performance – vegetative coverage is an important indicator of pollutant removal”

David Hirschman, Center for Watershed Protection

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Inspection, Maintenance, Verification – Requires Teamwork & Cross-Training

From Chesapeake Stormwater Network Bioretention Illustrated

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Types of Stormwater Practices Maintained by Landscape Crews

Conservation Landscapes Rain Gardens P ermeable Hardscapes Infil t ra tio n P r a ct ic es Rainwater Harvesting Green Roofs

1 1 1 1 1 2 2 2 3 3 3 4 4 5 5 5 6 6 6 4

Source: Anne Arundel WSA Rainscaping Manual

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Bioretention – Landscape & Conveyance

Bioretention Urban Bioretention Residential Rain Garden Water Quality or Dry Swale

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  • Urban trees/reforestation,
  • Riparian/coastal buffers

(regulated)

  • Conservation landscaping

Horticultural Restoration Practices

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Maintenance

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Develop a protocol and schedule for timing of maintenance tasks, inspection, reporting, and tracking

  • Conduct site visit with maintenance staff and train them!
  • Look over or develop maintenance plan and follow
  • Look over design/planting plan and follow
  • Train on proper equipment and methods (less heavy or

mechanical equipment, more hand-tools and hand- weeding)

  • Understand when additional expertise is required and

who to report this to.

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Typical Landscape Maintenance Tasks During BMP Establishment Phase

  • Regular watering if it has not

rained in two weeks

  • Spot re-seeding and

removal/replacement of dead plants

  • Remove any sediment

accumulation at inlets or the bed

  • Repair erosion on side-

slopes

  • (Landscape contract covers

first year after installation)

From: Chesapeake Stormwater Network

Make sure vegetatively Stabilized

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Vegetation Cover, Condition, Maintenance

  • Know your native plants versus weeds and how to

maintain them

  • Don’t fertilize
  • Time maintenance tasks based on growing season and

rainfall

  • Visit site to check between regular scheduled

maintenance.

  • Look for indicators of plant stress due to lack of water.
  • Check soil moisture, (consult soil specifications and

expert before adjusting with soil amendments)

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Vegetation Cover, Condition, Maintenance

From: Visual Indicator Profiles from Bioretention Illustrated Chesapeake Stormwater Network

  • Plant health and management includes
  • Healthy plants
  • Good cover
  • Few Bare Spots
  • Reduce the use of mulch and increase vegetative

ground coverage – less maintenance

  • Routinely divide and re-use within existing BMP or other

planted areas

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Dynamic Vegetation Management

Year 1 Year 3 Year 10

Original design plan should specify desired plant community through time Vegetation management is the key maintenance task.

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Typical Landscape Maintenance Tasks During BMP Establishment Phase

  • Perform any minor or moderate maintenance tasks, as

triggered by any visual indicator

  • Report to higher authority to “correct any severe

maintenance problems in response to a forensic BMP investigation.”

From: Section 5.1 Bioretention Illustrated Chesapeake Stormwater Network

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Diagram From: Chesapeake Stormwater Network

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Contributing Drainage Areas, Inlet and Pretreatment Areas

  • Is the contributing drainage area in good condition?
  • Inlet obstruction – easy landscape fix
  • Erosion at inlet – easy landscape fix
  • Pretreatment area – sediment, trash accumulation – easy

landscape fix

  • Inlet – structural failure – call expert

From: Visual Indicator Profiles from Bioretention Illustrated Chesapeake Stormwater Network

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Make Sure Water Gets in Inlets!

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Erosion and Sink Holes

  • Inlet
  • Side slope – light erosion – landscape fixes
  • Stabilize with spot re-seeding or vegetation
  • Severe slope erosion – call an expert
  • Subsidence or sink holes in bed – call an expert
  • Minor erosion in bed zone – landscape fix – rake and

cover

From: Visual Indicator Profiles from Bioretention Illustrated Chesapeake Stormwater Network

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Check for Level Filter Bed

Unlevel filter bed concentrates water in only one area ; uneven filtering Level filter bed -just like a bathtub - even distribution of flow across surface

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Water Flow and Ponding/Infiltration

  • Constant ponding in certain areas? Call an

expert

  • Pond area wet longer than 48 hours? Call an

expert

  • Flow into and out obstructed or diverted?
  • Diverted by mulch – easy landscape fix
  • Diverted by structural feature or slope – call expert

From: Visual Indicator Profiles from Bioretention Illustrated Chesapeake Stormwater Network

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Mulch or Sediment Deposition in Bed Zone

  • Caking or hardened sediment – easy landscape

fix by raking caked sediment – when to call an expert

  • Mulch displaced or thin – replace or add native

ground cover (vegetation/consult designer/planting plan for plant specs?)

  • Mulch too thick – blocks inlet, redirects water or

covers critical infiltration features

From: Visual Indicator Profiles from Bioretention Illustrated Chesapeake Stormwater Network

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Standing water? Cause?

Filter fabric, bad soil media, compaction, sediment film on top, clogged underdrain?

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Plumbing - underdrains

From: Visual Indicator Profiles from Bioretention Illustrated Chesapeake Stormwater Network

  • Is plumbing working?
  • Keep free of debris and sediment
  • Check for broken or missing caps
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Typical Landscape Maintenance Mistakes

  • Control Weeds and Invasive plants –
  • Stay on top of this and use sustainable control

methods – see manual

  • Don’t weedwack or mow planted areas unless specified

in maintenance plans

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Health of Vegetation: “Live & Learn”

  • Plants that do well or poorly in various applications
  • Unforeseen or unexpected conditions in the BMP (e.g.,

too wet, too sunny, etc.)

  • How different plant palettes/communities do over time
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Health of Vegetation: “Controllable”

  • Dirty Drainage Area
  • Wrong Plants
  • Inlets Clogged or Obstructed
  • Uneven Ponding
  • Bio-Desert
  • Previous Maintenance Practices (e.g., Mulch)
  • Previous “Non-Maintenance” Practices

For Each: Identify Why It May Impact Health of Vegetation

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Dirty Drainage Area

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Cultivars or Inappropriate Plants

Specified in Plan or As Substitutions During Construction

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Water Diverted Around Inlets: Water Can’t Get In!

Notice Sediment?

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Water Only Ponds At One End

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Sediment Crust or Caking

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Clogged Due To:

  • Bad Soil Media
  • Filter Fabric Below

Soil Media

  • Clogged Underdrain
  • No Underdrain
  • Sediment “Crust” on

Surface

  • Compaction During

Construction

  • Other?
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Is Filter Fabric A Good Idea?

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Bio-Desert: Media Too Sandy or Inflow is Too Little, Too Late

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Previous Maintenance Practices

If a little is good, more is not necessarily better!

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Enthusiasm For Mulch

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Previous “Non-Maintenance” Practices

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Additional Landscape Maintenance Mistakes on Conservation Landscapes or Buffers

  • Understory plants and trees are cleared to improve

views of waterways or landscaped with non-native plants causing disturbances to riparian and shoreline buffers.

  • Urban Tree Preservation Policies!
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Other?

Your Ideas

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Vegetated Practices: bioretention, rain gardens, bioswales, filter strips, living wall, buffers/shoreline, constructed wetlands, infiltration w/ vegetation

Component: Check For: Observations:

Drainage Area ฀ Erosion ฀ Sediment/Grit/Dirt ฀ Stockpiles: ฀ Bare soil ฀ Chemicals, oil, etc.: ฀ Other: Inlets to Practices: ฀ Pipes ฀ Curb cuts ฀ Sheetflow ฀ Other: ฀ Obstruction ฀ Erosion ฀ Structural/safety issues ฀ Other Pre-Treatment: ฀ Forebay ฀ Grass filter strip ฀ Grass channel ฀ Stone pad ฀ Other: ฀ None ฀ Full of sediment; needs clean-

  • ut

฀ Erosion ฀ Holding water ฀ Flow by-passes pre-treatment ฀ Other BMP Surface Area: ฀ Vegetation ฀ Mulch ฀ Other: ฀ Appears undersized ฀ Ponding depth too shallow ฀ Ponding depth too deep ฀ Not level; ponding not even across surface ฀ Sink holes ฀ Sediment caked on surface ฀ Standing water ฀ Trash ฀ Erosion Soil Media: ฀ Bioretention or Rain Garden mix ฀ Sand ฀ Other: ฀ Too much clay or wrong soil type; not permeable enough ฀ Too shallow ฀ Other: Side Slopes ฀ Erosion ฀ Unstable ฀ Other: Vegetation: ฀ Trees ฀ Shrubs ฀ Herbaceous ฀ Other: ฀ % surface area covered with vegetation: ฀ Many bare spots ฀ Dead/diseased/unhealthy plants ฀ Overgrown ฀ Invasives ฀ Too much mulch ฀ Other: Outlets: ฀ Underdrain(s) ฀ Overflow structure @ ponding depth ฀ Other ฀ Obstruction/clogging ฀ By-passing ฀ Erosion ฀ Structural problem ฀ Other: Other

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Permeable Pavement The ACTION is Below Ground!

  • Details vary – check on approved plan
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Typical Maintenance for Permeable Pavement From: Watershed Stewards Academy, Rainscaping Manual

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Permeable Pavement Maintenance

Vacuum Truck, max power 2500 rpm Restorative Preventative

Source: Tim Van Seters, Toronto and Region Conservation District

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Smaller Applications

Photo: NCSU Urban Waterways

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Cautions - Protect Area from Heavy Equipment & Construction Traffic

  • Keep Pavement Area Outside of Limits of

Disturbance

Photo Credit: Rob Roseen

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Maintenance Needed – Report!

Structural Damage Loose Gravel on Pavement Surface

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Pavement Surface: Some Accumulation of Fines Expected, But. . .

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Rainwater Harvesting Tanks: Above- Ground Examples

  • Use UV & impact resistant

material

  • Opaque to prevent algae
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Maintenance

  • Routine
  • Clean out

downspouts and filters, as needed

  • Check overflow area

for erosion

  • Check condition of

secondary practices

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Green Roof Layers

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Other: Rainwater Harvesting, Vegetated Roofs

Component: Check For: Observations: Rainwater Harvesting Roof Area/Gutters ฀ Overhanging branches ฀ Excessive debris ฀ Other: Pre-Treatment Filter: ฀ Vortex ฀ Roof washer ฀ Other ฀ None ฀ Flow by-passes pre-treatment ฀ Needs maintenance ฀ Structural problem ฀ Other: Tank/Cistern: ฀ Above ground ฀ Underground ฀ Material: ฀ Sediment accumulation (if possible to view) ฀ Structural problem/leaning ฀ Inadequate foundation ฀ Excessive algae growth ฀ Missing lids, screens ฀ Broken components ฀ Mosquito breeding ฀ Other: Plumbing components: ฀ Pumps ฀ Backflow preventer ฀ Covers ฀ Outlets/spigots ฀ None ฀ Other: ฀ Missing pieces ฀ Damaged or non-functional components ฀ Other: Overflow: ฀ Downstream practice ฀ Vegetated area ฀ None ฀ Other: ฀ Erosion ฀ Obstructed or clogged ฀ Other: Vegetated Roof Type ฀ Intensive ฀ Extensive ฀ Not sure Vegetation ฀ Many bare areas ฀ Dead/diseased/poor health ฀ Weeds/invasives ฀ Other: Structural ฀ Roof drains/scuppers ฀ Other: ฀ Obstructed, clogged ฀ Suspect leaks ฀ Broken components ฀ Other: