Title: Ed Weskerna McHenry County Soil and Water Conservation District
1Ed Weskerna McHenry County Soil and Water
Conservation District
2Erosion 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
3Planning 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,
4Other considerations
- Protection/Preservation of trees, septic areas,
buffer areas. - Access points for construction equipment.
- Time of year
5Data Collection
- Topography
- Drainage
- Soils
- Ground cover
- Adjacent areas
- Permit requirements
6Topography
- 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)
7Drainage patterns
- Identify drainage patterns such as
- overland flow
- swales and depressions
- natural watercourses
- manmade ditches
- tile outlets
- BE AWARE OF ILLINOIS DRAINAGE LAWS
8Soils information
- Soil properties such as
- depth to bedrock
- erodibility potential
- seasonal watertables
- permeability
- texture
9Ground Cover
- Preservation of existing ground cover and trees.
- Phasing development vs. mass grading
- Alternatives include temporary seeding, mulching
or sodding or netting.
10Adjacent Areas
- Consideration must be given to downstream effects
of the construction site. - Streams
- Roads
- houses
- wetlands
11Permit Requirements
- Army Corps permits for filling wetlands
- IDNR permits for floodway activities
- Local ordinances
12What 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
13 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.
-
14Continued.
- Structural controls such as
- Temporary sediment traps
- Rock check dams
- Silt fence
- Stormwater inlet protection
15Continued..
- 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.
16Continued .
- 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
17List of Responsible Parties
- When problems occur who are the contacts.
- Contractor
- Developer/Owner
- Enforcement agency
18Inspections
- How often
- After each 1/2 inch of rainfall
- What to look for
- Timeline for corrective actions
19Why we dont use straw bales
20Rock Check dams instead of silt fence or straw
bales
21Inappropriate use of straw bale in concentrated
flow
22Incorporate emergency spillway
23Locating storm sewer infrastructure too close to
rivers
24Stormwater detention basins act as sediment
basins during construction
25Not quite stabilized before use
26Gabion Baskets for streambank erosion control
27Dirt bag for removing silt in de-watering process.
28Streambank stabilization utilizing erosion
control blankets
29Stream channel stabilization and floodplain
creation
30Mass graded site
31Mass graded site and unprotected soil stockpile
near creek