Ed Weskerna McHenry County Soil and Water Conservation District - PowerPoint PPT Presentation
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Ed Weskerna McHenry County Soil and Water Conservation District
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Ed Weskerna. McHenry County Soil and Water Conservation District ... Mass graded site. Mass graded site and unprotected soil stockpile near creek ... – PowerPoint PPT presentation
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Title: Ed Weskerna McHenry County Soil and Water Conservation District
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Ed Weskerna McHenry County Soil and Water
Conservation District
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Erosion Control Planning Process
- Plan the Development to fit the site
- Determine the limits of land disturbance
- Subdivide the site into natural drainage areas
- Development phasing
- Confine construction activities to least critical
areas. - Cluster buildings
- Minimize impervious areas
- Minimize disturbed areas
- Utilize natural drainage systems (instead of
storm sewers or concrete channels). - Select the proper E S practices
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Planning process continued
- Determine the location of environmentally
sensitive areas - Determine the surrounding land uses and the
locations of environmentally sensitive areas. - Know what the proposed development plan is. E.g.
Single family residential, industrial,
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Other considerations
- Protection/Preservation of trees, septic areas,
buffer areas. - Access points for construction equipment.
- Time of year
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Data Collection
- Topography
- Drainage
- Soils
- Ground cover
- Adjacent areas
- Permit requirements
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Topography
- Primary considerations are slope length and
steepness. - 0-4 low potential (if lt 400 ft)
- 5-7 moderate potential (if lt 100 ft)
- 8-15 high potential (if lt 25 ft)
- gt 15 extreme (no tolerance)
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Drainage patterns
- Identify drainage patterns such as
- overland flow
- swales and depressions
- natural watercourses
- manmade ditches
- tile outlets
- BE AWARE OF ILLINOIS DRAINAGE LAWS
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Soils information
- Soil properties such as
- depth to bedrock
- erodibility potential
- seasonal watertables
- permeability
- texture
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Ground Cover
- Preservation of existing ground cover and trees.
- Phasing development vs. mass grading
- Alternatives include temporary seeding, mulching
or sodding or netting.
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Adjacent Areas
- Consideration must be given to downstream effects
of the construction site. - Streams
- Roads
- houses
- wetlands
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Permit Requirements
- Army Corps permits for filling wetlands
- IDNR permits for floodway activities
- Local ordinances
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What are the main components of a plan?
- Plat or location map- gives perspective of where
the the parcel is located. - Existing topo information -provides an overview
of existing conditions and the location of water
courses and depressional areas. - Proposed topo information -When compared to the
existing topo this will provide information on
cuts and fills
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continued...
- Vegetative-first line of defense
- Maintain existing vegetation
- Minimize areas that will be stripped of
vegetation. - Minimize the length of time areas are exposed.
- Seed down areas immediately after final grade is
established - Consider time of year construction begins.
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Continued.
- Structural controls such as
- Temporary sediment traps
- Rock check dams
- Silt fence
- Stormwater inlet protection
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Continued..
- Management measures
- Schedule pre-construction meeting
- Sequence construction
- Anticipate site conditions that will exist as the
construction progresses toward the final product. - Have materials on hand to complete work without
delay - Apply temporary stabilization immediately after
grading.
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Continued .
- Stage or phase construction so one area can be
stabilized before another is disturbed - Consider the time of year
- Be prepared for sudden t-storms
- Install ES controls immediately
- Use straw mulch, especially during poor
germination periods - Start projects in early spring to allow for
vegetation to establish
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List of Responsible Parties
- When problems occur who are the contacts.
- Contractor
- Developer/Owner
- Enforcement agency
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Inspections
- How often
- After each 1/2 inch of rainfall
- What to look for
- Timeline for corrective actions
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Why we dont use straw bales
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Rock Check dams instead of silt fence or straw
bales
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Inappropriate use of straw bale in concentrated
flow
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Incorporate emergency spillway
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Locating storm sewer infrastructure too close to
rivers
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Stormwater detention basins act as sediment
basins during construction
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Not quite stabilized before use
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Gabion Baskets for streambank erosion control
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Dirt bag for removing silt in de-watering process.
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Streambank stabilization utilizing erosion
control blankets
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Stream channel stabilization and floodplain
creation
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Mass graded site
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Mass graded site and unprotected soil stockpile
near creek
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