Title: State of Florida Sediment and Erosion Control Designer and Reviewer Manual
1State of FloridaSediment and Erosion
ControlDesigner and Reviewer Manual
- Jerald S. Fifield, Ph.D., CPESC
- HydroDynamics Incorporated
2Designers and Reviewers
- Think about the different construction phases
3Construction Phases
- Pre-grading
- Assessment of sediment control BMPs needs to
occur - During grading
- Mass chaos is occurring
- Predominately sediment control with some erosion
control
4Construction Phases
- Utilities and infrastructure
- Mass chaos continues
- Predominately sediment control with some erosion
control - After grading, utilities, and infrastructure
- Land stabilization (a.k.a. erosion control)
becomes predominate - Sediment control should remain upstream of
discharge points
5Construction Phases
- While building occurs
- Disturbance of land stabilization
- Effective sediment control becomes critical
- At local and regional scales
- Mass chaos again
- Erosion control occurs during development
- Homes, landscaping, driveways, etc.
- Post construction
- Erosion control
6Can construction activities be completed without
non-compliance conditions ever occurring?
- NO
- but communication and cooperation can minimize
the problems
7Circle of Communication and Cooperation
REGULATORY INSPECTOR DESIGNER CONTRACTOR
8Key Links are Designers and Reviewers
- Both must know how to develop and review
effective and practical sediment and erosion
control plans for contractors
Which is the goal of this manual
9Manual Comparison
- Designer/Reviewer
- Specific reference manual
- Designers and reviewers
- Detailed guidelines on developing SWPPPs and ESC
drawings - Application of engineering and scientific
principles - Guidelines for developing effective and practical
plans - BMP Material
- Detailed and general information
- Engineering and scientific material
- FDEP Inspectors
- General reference manual
- Inspectors, contractors, designers, and reviewers
- General information on SWPPP development
- Installation, inspection and maintenance
requirements - Training manual about BMPs
- BMP Material
- General information
10FDEP Inspector Manual
11Designer and Reviewer Manual
12Section I
13Section I
- Introduction
- Purpose of the Manual
- Basic Definitions
- Erosion, sediment, and sedimentation
14What is Erosion?
- Soil particles suspended in water or the air.
- Deposition of soil particles suspended in water
or air. - Soil particles displaced by the action of wind or
water.
15What is Sediment?
- Soil particles suspended in water or the air.
- Deposition of soil particles suspended in water
or air. - Soil particles displaced by the action of wind or
water.
16What is Sedimentation?
- Soil particles suspended in water or the air.
- Deposition of soil particles suspended in water
or air. - Soil particles displaced by the action of wind or
water.
17Section I
- Introduction
- Purpose of the Manual
- Basic Definitions
- Erosion, sediment, and sedimentation
- Impacts of Sedimentation
18Section I
- Regulations and Statutory Requirements
- Construction Activities
- Operator Obligations
- Construction General Permit
- SWPPP, ESC Drawings, NOI, NOT, Inspections,
Records, etc.
19Section II
- Developing Effective SWPPPs and ESC drawings
20Section II
- Contents of a SWPPP
- Narrative Report
- Designer certification requirement
- Contractor certification requirement
- Calculations
- ESC Drawings
- Record Requirements
21Section II
- Developing Effective ESC Drawings
- For the Contractor to Implement
- Practical
- Effective
- Accountability by
- Designers and reviewers
22EROSION CONTROL MEASURES SHALL BE INSTALLED PRIOR
TO GRADING OR EXCAVATION ACTIVITIES
NONE
WHAT EROSION CONTROL MEASURES ARE INSTALLED PRIOR
TO GRADING OR EXCAVATION ACTIVITIES?
23SF
SM
RS
SB
RS
RS
SM
SF
RS
SM
RS
SF
SM
SF
SB
SM
RS
RS
SM
RS
SM
SF
SB
RS
SM
SF
SF
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25WHEN?
WHICH IS IT, SILT FENCE OR SOD?
WHEN?
WILL SOD BE AVAILABLE?
HUH?
WHY FOUR DAYS FOR THE SWALE AND 10 DAYS FOR THE
SLOPE?
WHAT IS MEANT BY PERMANENT GRASSING?
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29Pre- and during grading or construction drawings
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31After grading or construction drawings
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36Section III
37Section III
- Vegetation
- Mulches and Soil Binders
- Selecting Rolled Erosion Control Products
- Disturbed slopes
- Drainage channels
- Shear stress and velocity evaluations
38MAXIMUM SHEAR STRESS ON THE BOTTOM OF A CHANNEL
t g x Y x SIN(?)
FORCE
g 9,810 N/m3 for SI Units
FORCE
g 62.4 lbs./ft3 for Imperial Units
WHEN THE ANGLE IS SMALL,
t g x Y x S
39Section III
- Vegetation
- Mulches and Soil Binders
- Selecting Rolled Erosion Control Products
- Disturbed slopes
- Drainage channels
- Shear stress and velocity evaluations
- Runoff Control Structures
- Diversion structures
- Sizing based upon climatic events
- Check structures
- Spacing requirements for erosion control
40FOR EXAMPLE
- What size pipe is needed to convey runoff from
8.4 acres of a sandy wooded area when a 10-year
storm event occurs in Zone 3 (Slope 2.3 and
Tc12 minutes)?
41Example of Calculating Slope Drain Pipe Diameters
- What size pipe is needed to convey runoff from
8.4 acres of a sandy wooded area when a 10-year
storm event occurs in Zone 3 (Slope 2.3 and
Tc12 minutes)? - Step 1. Determine the runoff coefficient from
Table III-3 - C 0.15 to 0.20
- Step 2. Determine the rainfall intensity in Zone
3 - i 6.8 inches/hour
- Step 3. Calculate a pipe diameter
- D 4.29 x (CiA) 0.50
- 4.29 x (0.20 x 6.8 x 8.4) 0.50
- 14.5 inches
- Step 4 Select the pipe.
- Use an 18-inch diameter pipe.
42Section IV
- Sediment Containment Systems
43Section IV
- Introduction to an SCS
- Sediment basin, pond or trap
- Designing an Effective SCS
44Section IV
- Introduction to SCSs
- Sediment basin, pond or trap
- Designing an Effective SCS
- Outlet Structures
- Dewatering Structures
- Pre-Sedimentation (a.k.a. Forebay) Basins
- How to Increase the Effectiveness
- Polymers or alum
45MIX IN A POLYMER
46FOR EXAMPLE
- What size in-line temporary sedimentation basin
is needed to capture polymer treated runoff
waters from 5.0 acres of disturbed lands for a
storm event of 2.75 inches? - Parameters Average slope 2.50
- Hydrologic Type C Soils
- K 0.40
47Section IV
- Step 1 Determine the Sediment Yield
- LR 210 cu. ft/ac1.12
- Sediment Yield (Ksite?Kchart) x LR x A1.12
- (0.40 ? 0.43) x 210 x 5.01.12
- 1,185 cubic feet
- Step 2 Calculate Basin Parameters
- Surface Area 0.67 x Sediment Yield
- 0.67 x 1,185 794 sq. ft.
- Length 3.79 x (Surface Area)0.50
- 3.79 x (794)0.50
- 106 feet
- Width 0.10 x Length
- 0.10 x 106
- 11 feet
- Depth 1.5 feet (Minimum)
48Section V
- Temporary Construction Site BMPs
49Section V
50Section V
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53Evaluate all Temporary BMPs for Their Uses
AND KNOW THEIR LIMITATIONS
54In Summary, it is anticipated the manual will
result in
- Contractors and designers working together for
effective and practical plans. - ESC drawings being developed for the contractor.
- Increased communication and cooperation between
all parties. - Designers and reviewers being accountable for
plans they design and/or approve. - Better protection of the environment.
55Designers and Reviewers
- This manual will help you to think out of the box
to protect the environment
And to develop effective and practical ESC plans
for the contractor to implement