vegetation by Er. Harish

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Vegetation Establishment
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Exposed soil occurs on all construction sites
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Soil Stabilization

• Soil stabilization is the component that combines
  with runoff control to be the concepts that limit
  or control erosion.
• Every effort should be made to keep the soil in
  place and limit its migration within the project
  area to minimize the need for sediment control.

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Protect Surface
Vegetative Soil Cover
Non-Vegetative Cover
Temporary Seeding
Mulching
Permanent Seeding
Riprap Slope Protection
Topsoiling
Sodding
Protecting Vegetation
Rec. Area Improvement
Dune Stabilization
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This site was temporary seeded (dormant seeding)
in January, and it germinated by April.
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Seeding Techniques

• Drill Seeding

Its important for the seed to be in direct
contact with the soil.this machine is a drill
seeder.
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Seeding Techniques

• Helicopter Seeding

Helicopters can distribute seed over a large area.
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Seeding Techniques

• Hydraulic Seeding

This is one of the most common seeding methods
for construction sites.
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Graded slopes should be topsoiled and seeded as
soon as practical
But what is the problem do you seen with this
photo with the sediment barrier?
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Native Regrowth Method
The key to this simple process is that it can
preclude the need for soil amendments, seeding,
and irrigation.
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Sod provides immediate soil cover.
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Protect Existing Vegetation

• Wherever possible, existing vegetation should be
  preserved.

Leaving existing vegetation is particularly
important along the site perimeter or adjacent to
water bodies.
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Temporary Seeding

• Purpose Establishment of temporary stand of
  grass and/or legume by seeding and mulching soils
  that will be exposed for a period grater then one
  month but less then 12 months.
• Applicability Within the firs 7 days of
  suspending works on a grading operation that
  exposes erodible sols where such suspension is
  expected to last for 1 to 12 month. Such areas
  include soil stockpiles, borrow pits, road banks
  and other disturbed and unstable areas.
• Not for use on areas that are to be left dormant
  for more then 1 year. Use permanent vegetative
  measures in those situations.

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Specifications

• Ensure proper species are selected for season and
  site conditions (review seed mixture used by
  inspecting bag labels).
• Ensure seeding is done within optimum seeding
  dates.
• Ensure proper site preparation and sequencing of
  seeding operation with other operations.
• Ensure proper seedbed preparation including
  appropriate top soil materials (loose friable
  soil), and use of appropriate seeding equipment.
• Use Mulch on those sites when called for or in
  seeding outside of approved dates.

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Maintenance

• Inspect seeded areas at least once a week and
  within 24 hours of the end of a storm with a
  rainfall amount of 0.5 inch or greater for seed
  and mulch movement and rill erosion.
• Where seed has moved or where soil erosion has
  occurred, determining the cause of the failure.
  Repair rills and other areas where soil has been
  eroded. Re-seed and re-mulch. Inspect for
  evidence of concentrated flows and bring to
  attention of site engineer for possible
  structural design needs.
• Continue inspections until the grasses are firmly
  established. Grasses shall not be considered
  established until a ground cover is achieved
  which is mature enough to control soil erosion
  and to survive severe weather conditions
  (approximately 80 of surface cover is
  vegetated).

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Temporary seeding can be quite cost effective.
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Permanent Seeding

• Purpose To permanently stabilize the soil with
  a vegetative cover that will prevent damage from
  wind and/or water erosion and sedimentation.
• Applicability
• On disturbed or eroded soils have been brought to
  final grade or where the suspension of work is
  expected to exceed one year, and
• Where slopes gradients are no steeper then 21.
  for slopes steeper then 21 use slope
  stabilization measures that include structural
  measures.

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Specifications

• Ensure proper species are selected for season and
  site conditions (review seed mixture used by
  inspecting bag labels look for pure live seed
  percentages and ensure legumes are inoculated).
• Ensure seeding is done within optimum seeding
  dates.
• Ensure proper site preparation and sequencing of
  seeding operation with other operations.
• Ensure proper seedbed preparation including
  appropriate top soil materials (loose friable
  soil), and use of appropriate seeding equipment.
• Ensure lime and fertilizer have been applied
  based upon soil test recommendations or use of
  standardized recommendations for species
  selected.
• Use Mulch on those sites when called for or in
  seeding outside of approved dates.
• Consider irrigation needs during periods of low
  rainfall.

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Maintenance

• Inspect seeded areas at least once a week and
  within 24 hours of the end of a storm with a
  rainfall amount of 0.5 inch or greater for seed
  and mulch movement and rill erosion.
• Where seed has moved or where soil erosion has
  occurred, determining the cause of the failure.
  Repair rills and other areas where soil has been
  eroded. Re-seed and re-mulch. Inspect for
  evidence of concentrated flows and bring to
  attention of site engineer for possible
  structural design needs.
• Continue inspections until the grasses are firmly
  established. Grasses shall not be considered
  established if there is less then 100 plans per
  square foot after 4 weeks of growth. If not,
  reseed as planting season allows, if not, mulch
  area with approved mulch at approved rate.
• Allow majority of plants to achieve a height of
  at least 6 inches before first mowing and mow
  afterwards on a schedule in operation and
  maintenance plan.

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Questions