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Vegetation Establishment

Vegetation Establishment. Exposed soil occurs on all construction sites. Soil Stabilization. Soil stabilization is the component that combines with runoff control to be the concepts that limit or control erosion.

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Vegetation Establishment

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  1. Vegetation Establishment

  2. Exposed soil occurs on all construction sites

  3. 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.

  4. 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

  5. This site was temporary seeded (dormant seeding) in January, and it germinated by April.

  6. Drill Seeding Seeding Techniques It’s important for the seed to be in direct contact with the soil….this machine is a drill seeder.

  7. Seeding Techniques Helicopter Seeding Helicopters can distribute seed over a large area.

  8. Hydraulic Seeding Seeding Techniques This is one of the most common seeding methods for construction sites.

  9. 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?

  10. Native Regrowth Method The key to this simple process is that it can preclude the need for soil amendments, seeding, and irrigation.

  11. Sod provides immediate soil cover.

  12. 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.

  13. 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.

  14. 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).

  15. Temporary seeding can be quite cost effective.

  16. 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 2:1. for slopes steeper then 2:1 use slope stabilization measures that include structural measures.

  17. 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.

  18. 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.

  19. Questions

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