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State of Florida Sediment and Erosion Control Designer and Reviewer Manual

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Title: State of Florida Sediment and Erosion Control Designer and Reviewer Manual


1
State of FloridaSediment and Erosion
ControlDesigner and Reviewer Manual
  • Jerald S. Fifield, Ph.D., CPESC
  • HydroDynamics Incorporated

2
Designers and Reviewers
  • Think about the different construction phases

3
Construction Phases
  • Pre-grading
  • Assessment of sediment control BMPs needs to
    occur
  • During grading
  • Mass chaos is occurring
  • Predominately sediment control with some erosion
    control

4
Construction 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

5
Construction 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

6
Can construction activities be completed without
non-compliance conditions ever occurring?
  • NO
  • but communication and cooperation can minimize
    the problems

7
Circle of Communication and Cooperation
REGULATORY INSPECTOR DESIGNER CONTRACTOR
8
Key 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
9
Manual 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

10
FDEP Inspector Manual
11
Designer and Reviewer Manual
12
Section I
  • General Information

13
Section I
  • Introduction
  • Purpose of the Manual
  • Basic Definitions
  • Erosion, sediment, and sedimentation

14
What 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.

15
What 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.

16
What 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.

17
Section I
  • Introduction
  • Purpose of the Manual
  • Basic Definitions
  • Erosion, sediment, and sedimentation
  • Impacts of Sedimentation

18
Section I
  • Regulations and Statutory Requirements
  • Construction Activities
  • Operator Obligations
  • Construction General Permit
  • SWPPP, ESC Drawings, NOI, NOT, Inspections,
    Records, etc.

19
Section II
  • Developing Effective SWPPPs and ESC drawings

20
Section II
  • Contents of a SWPPP
  • Narrative Report
  • Designer certification requirement
  • Contractor certification requirement
  • Calculations
  • ESC Drawings
  • Record Requirements

21
Section II
  • Developing Effective ESC Drawings
  • For the Contractor to Implement
  • Practical
  • Effective
  • Accountability by
  • Designers and reviewers

22
EROSION CONTROL MEASURES SHALL BE INSTALLED PRIOR
TO GRADING OR EXCAVATION ACTIVITIES
NONE
WHAT EROSION CONTROL MEASURES ARE INSTALLED PRIOR
TO GRADING OR EXCAVATION ACTIVITIES?
23
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SM
SF
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SM
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SF
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24
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25
WHEN?
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?
26
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Pre- and during grading or construction drawings
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After grading or construction drawings
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36
Section III
  • Erosion Control Methods

37
Section III
  • Vegetation
  • Mulches and Soil Binders
  • Selecting Rolled Erosion Control Products
  • Disturbed slopes
  • Drainage channels
  • Shear stress and velocity evaluations

38
MAXIMUM 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
39
Section 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

40
FOR 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)?

41
Example 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.

42
Section IV
  • Sediment Containment Systems

43
Section IV
  • Introduction to an SCS
  • Sediment basin, pond or trap
  • Designing an Effective SCS

44
Section 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

45
MIX IN A POLYMER
46
FOR 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

47
Section 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)

48
Section V
  • Temporary Construction Site BMPs

49
Section V
50
Section V
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53
Evaluate all Temporary BMPs for Their Uses
AND KNOW THEIR LIMITATIONS
54
In 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.

55
Designers 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
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