Section 7 – Erosion Control Details

SEPT 2019

Section 7 – Erosion Control Details

Revision Date Erosion Control General Notes EC-000 SEPT 2019 Erosion Control General Notes EC-001 SEPT 2019 Stabilized Construction Entrance EC-010 SEPT 2019 Sediment Fence EC-040 SEPT 2019 Sidewalk Subgrade Curb Barrier EC-055 SEPT 2019 Sediment Trap EC-060 SEPT 2019 Sediment Basin EC-070 SEPT 2019 Interceptor Swales and Dikes EC-080 SEPT 2019 Surface Roughening EC-085 SEPT 2019 Filter Fabric Inlet Barrier EC-090 SEPT 2019 Filter Mat Inlet Protection EC-095 SEPT 2019 Inlet Protection Biofilter Bags EC-120 SEPT 2019 Rock Check Dam EC-130 SEPT 2019 Geotextile Encased Check Dam EC-140 SEPT 2019 Erosion Control Blanket EC-150 SEPT 2019 Channel Installation EC-155 SEPT 2019 Pipe Slope Drain EC-170 SEPT 2019 Straw Wattles EC-180 SEPT 2019 Plastic Covering/Sheeting EC-190 SEPT 2019 Concrete Washout EC-200 SEPT 2019

EROSION CONTROL GENERAL NOTES

EC - 000

SEPT 2019

K.H.

K.H.

EROSION CONTROL GENERAL NOTES

EC - 001

SEPT 2019

EROSION CONTROL SYMBOLS

EC - 005

SEPT 2019

K.H.

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EC - 010

SEPT 2019

K.H.

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INFO

RMAT

ION

SEDIMENT FENCE

EC - 040

SEPT 2019

K.H.

SIDEWALK SUBGRADE CURB BARRIER

EC - 055

SEPT 2019

K.H.

2' SETTLING DEPTH

1.5' SEDIMENT STORAGE

4' MIN.

5' M

AX

.

1' OVERFLOW DEPTH

OUTFLOW CHANNEL IF

CONSTRUCTED BY

EXCAVATION

CROSS SECTION

O

V

E

R

F

L

O

W

S

P

I

L

L

W

A

Y

6

'

M

I

N

.

L

E

N

G

T

H

3

1

3

1

SEDIMENT TRAP OUTLET

6' MIN.

TO BE CONSTRUCTED

BY EXCAVATION

WASHED GRAVEL

GEOTEXTILE

FILTER FABRIC

FENCING

1'

3

4

" - 1

1

2

"

NOTES:

1. SEDIMENT TRAPS SHALL BE LIMITED TO DRAINAGE AREAS OF LESS THAN 3 ACRES. FOR DRAINAGE AREAS GREATERTHAN 3 ACRES, SEE EC-070 (SEDIMENT BASIN).

2. THE SEDIMENT TRAP IS TO BE LOCATED IN A LOW AREA WHERE THE TRAP WILL INTERCEPT ALL OR MOST OF THERUNOFF FROM THE DISTURBED AREA.

3. THE SEDIMENT TRAP MAY BE FORMED COMPLETELY BY EXCAVATION OR BY CONSTRUCTION OF A COMPACTEDEMBANKMENT.

4. SEDIMENT TRAPS ARE TO HAVE A LEVEL BOTTOM, 3:1 OR FLATTER SIDE SLOPES AND A LENGTH-TO-WIDTH RATIO OF3.

5. THE SEDIMENT TRAP SHALL DISCHARGE TO A STABILIZED CONVEYANCE, OUTLET OR LEVEL SPREADER. A SEDIMENTFENCE SHALL BE CONSTRUCTED IMMEDIATELY DOWNSTREAM OF THE OUTFLOW POINT.

6. INSPECT ONCE PER WEEK AND WITHIN 24 HOURS FOLLOWING A 0.5 INCH RAIN EVENT.

7. REMOVE SEDIMENT FROM THE TRAP WHEN IT REACHES 1 FOOT IN DEPTH.

8. REFER TO BMP C240 IN VOLUME II OF THE STORMWATER MANAGEMENT MANUAL FOR WESTERN WASHINGTON FORMORE INFORMATION.

2" - 4" ROCK

SEDIMENT TRAP

EC - 060

SEPT 2019

K.H.

POND LENGTH >= 3 X POND WIDTH

A

A

L

E

V

E

L

B

O

T

T

O

M

RISER PIPE W/ ANCHOR BASE

OUTLET PIPE

EMERGENCY

OVERFLOW

SPILLWAY CREST

PERFORATED DRAIN PIPE

IN GRAVEL-FILLED TRENCH

SEDIMENT FENCE

(OPTIONAL)

LEVEL BOTTOM

3' MAX

STORAGE DEPTH

2' MIN

SETTLING DEPTH

DEWATERING OUTLET

RISER PIPE OPEN AT TOP

(PRINCIPLE SPILLWAY)

FREEBOARD

SPILLWAY DEPTH

6' MIN.

PROVIDE TRASH RACK

ON RISER PIPES ³ 18" DIA.

EMERGENCY OVERFLOW

SPILLWAY CREST

OUTLET PIPE

ANTI-SEEP COLLARS

RIP-RAP

(ENERGY DISSIPATION)

ANCHOR BASE TO

PREVENT FLOTATION

PERFORATED DRAIN PIPE LINE

TRENCH W/ FILTER FABRIC

SECTION A - A

3

1

2

1

PLAN VIEW

RIP RAP

INLET

SEDIMENT

FENCE

DRAIN ROCK

SEDIMENT

FENCE

RIP RAP

1'

1'

NOTES:

1. SEDIMENT BASINS MAY BE CONSTRUCTED BY BERMS OR BY PARTIAL OR COMPLETE EXCAVATION. BASIN LENGTHS SHALL BE 3 TO 6 TIMES THEMAXIMUM BASIN WIDTH.

2. GRADE BOTTOM OF BASIN AS LEVEL AS POSSIBLE.

3. ALL INLETS AND OUTLETS SHALL BE PROTECTED BY RIP-RAP. OVERFLOW SPILLWAY SHALL BE LINED WITH 2” - 4” ROCK.

4. PERFORATED PIPE TRENCH SHALL BE COMPLETELY LINED WITH FILTER FABRIC.

5. THE SEDIMENT BASIN SHALL DISCHARGE TO A STABILIZED CONVEYANCE, OUTLET OR LEVEL SPREADER. A SEDIMENT FENCE SHALL BECONSTRUCTED IMMEDIATELY DOWNSTREAM OF THE OUTFLOW POINT.

6. INSPECT ONCE PER WEEK AND WITHIN 24 HOURS FOLLOWING A 0.5 INCH RAIN EVENT.

7. REMOVE SEDIMENT FROM THE BASIN WHEN IT REACHES 1 FOOT IN DEPTH.

8. SEDIMENT BASINS SHALL BE SIZED AND DESIGNED BY A LICENSED CIVIL ENGINEER.

9. STRUCTURES HAVING A MAXIMUM STORAGE CAPACITY AT THE TOP OF BERM OF 10 ACRE-FT (435,600 FT3) OR MORE ARE SUBJECT TO THEWASHINGTON DAM SAFETY REGULATIONS (CHAPTER 173-175 WAC).

10. REFER TO BMP C241 IN VOLUME II OF THE STORMWATER MANAGEMENT MANUAL FOR WESTERN WASHINGTON FOR MORE INFORMATION.

SEDIMENT BASIN

EC - 070

SEPT 2019

K.H.

1' MIN.

2' MIN.

LEVEL BOTTOM

SWALE SPACING DEPENDS

ON SLOPE GRADIENT

18" MIN.

2:1 MAX. SLOPE

DIKE MATERIAL COMPACTED

TO 95% OF ASTM D1556

DIKE SPACING DEPENDS

ON SLOPE GRADIENT

2' MIN.

2:1 MAX. SLOPE

NOTES:

1. SWALES OR DIKES ARE DESIGNED TO INTERCEPT STORMWATER RUNOFF TO EITHER PREVENT IT FROM ENTERING A DISTURBED AREA OR TOREDIRECT SEDIMENT-LADEN WATER LEAVING A DISTURBED AREA.

2. INTERCEPTOR SWALES SHALL MEET THE FOLLOWING CRITERIA:

A. BOTTOM WIDTH: 2 FEET MINIMUM

B. DEPTH: 1 FOOT MINIMUM

3. INTERCEPTOR DIKES SHALL MEET THE FOLLOWING CRITERIA:

A. TOP WIDTH: 2 FEET MINIMUM

B. HEIGHT: 1.5 FEET MINIMUM ON BERM

4. SIDE SLOPES OF SWALES/DIKES SHALL BE NO GREATER THAN 2:1.

5. MAXIMUM SLOPE OF FLOW PATH ALONG SWALES AND PERPENDICULAR TO DIKES SHALL BE EQUAL TO OR LESS THAN 5 PERCENT.

6. HORIZONTAL SPACING OF SWALES/DIKES BASED ON SITE SLOPE:

Slope 3-5% 5-10% 10-25% 25%-50%Distance 300 FT 200 FT 100 FT 50 FT

7. FLOWS SHOULD DISCHARGE TO A SUITABLE OUTLET (SUCH AS A SEDIMENT TRAP OR SEDIMENT BASIN).

8. DIKES AND SWALES SHALL BE STABILIZED WITH TEMPORARY OR PERMANENT VEGITATION OR OTHER CHANNEL PROTECTION THROUGHOUTTHE CONSTRUCTION PHASE; STEEPER GRADES REQUIRE CHECK DAMS.

9. INSPECT ONCE PER WEEK AND WITHIN 24 HOURS FOLLOWING A 0.5 INCH RAIN EVENT. REPAIR ANY DAMAGE IMMEDIATELY.

10. REFER TO BMP C200 IN VOLUME II OF THE STORMWATER MANAGEMENT MANUAL FOR WESTERN WASHINGTON FOR MORE INFORMATION.

INTERCEPTOR SWALES AND DIKES

EC - 080

SEPT 2019

K.H.

SURFACE ROUGHENING

EC - 085

SEPT 2019

K.H.

FILTER FABRIC

(ALL FOUR SIDES)

INLET WITH GRATE

FILTER FABRIC

MATERIAL STAPLED

TO STAKES

RUNOFF WATER

WITH SEDIMENT

INLET WITH GRATE

BURY FILTER FABRIC

(MINIMUM 6" DEPTH)

WOOD STAKES

(2" X 2" X 3')

WOOD STAKES

(2" X 2" X 3')

FILTER FABRIC INLET BARRIER

EC - 090

SEPT 2019

K.H.

PLAN VIEW

FILTER MAT

BACK OF CURB

CURB INLET

CURB INLET

FILTER MAT

STREET CURB INLET GRATE

7 ZIP TIES

AND HOLD-DOWN PADS

FLAT STREET GRATE

8 ZIP TIES

AND HOLD-DOWN PADS

NOTES:

1. FOR USE ON DROP INLETS AND CURB INLETS IN PAVED AREAS.

2. POSITION FILTER MAT ON INLET GRATE WITH MINIMUM 1 INCH

OVERLAP ON EACH SIDE.

3. ATTACH WITH CABLE TIES. USE A MINIMUM OF 7 TIES FOR CURB

INLET GRATES AND 8 FOR FLAT INLET GRATE.

4. INSPECT ONCE PER WEEK AND WITHIN 24 HOURS FOLLOWING A 0.5

INCH RAIN EVENT.

5. REMOVE DEBRIS AND SEDIMENT BUILDUP FROM BEHIND AND TOP

OF MAT.

6. REPLACE WITH NEW FILTER MAT AS NEEDED TO ENSURE PROPER

FUNCTION.

CROSS SECTION VIEW

1" MIN.

INLET PROTECTION FILTER MAT

EC - 095

SEPT 2019

K.H.

AA

FLO

W

BIO

FILT

ER

B

AG

ST

AK

ES

BIO

FILT

ER

B

AG

ST

AK

E

BIO

FILT

ER

B

AG

FLO

WF

LO

W

BIO

FILT

ER

B

AG

S

ST

AK

ES

PL

AN

DIT

CH

IN

LE

T

SE

CT

IO

N A

-A

CA

TC

H B

AS

IN

AR

EA

D

RA

IN

FLO

W

DIT

CH

B

OT

TO

M

FA

CE

O

F C

UR

B

18" M

AX

.

INLET PROTECTION BIOFILTER BAGS

EC - 120

SEPT 2019

K.H.

1

2

'L'

1

2

'L' = THE DISTANCE SUCH THAT POINTS

'A' & 'B' ARE THE SAME ELEVATION

EXTENDED SECTION A-A

SPILLWAY POINT B

1' SUMP

OPTIONAL

F

LO

W

A

A

.

18"

VIEW LOOKING UPSTREAM

EXISTING

CHANNEL

EFFECTIVE DAM

HEIGHT VARIES

BASED ON FLOW

2" - 4" ROCK

SPILLWAY

WEIR DEPTH 'D'

8" MIN

1

2

1

2

SPILLWAY

8" MIN

EFFECTIVE HEIGHT

VARIES BASED

ON FLOW

8" MIN

POINT A

1

2

ROCK CHECK DAM

EC - 130

SEPT 2019

K.H.

A

B

FLOW

FR

ON

T A

PR

ON

RE

AR

A

PR

ON

ST

AP

LE

S (T

YP

.)

(3

' M

AX

. S

PA

CIN

G)

BA

CK

O

F D

IT

CH

(T

YP

.)

C

DIT

CH

L

CH

EC

K D

AM

3" M

IN

.

BA

CK

O

F D

IT

CH

(T

YP

.)

P

LA

N V

IE

W

S

EC

TIO

N A

FL

OW

DIG

T

RE

NC

H A

PP

RO

XIM

AT

EL

Y 6

" W

ID

E

AN

D D

EE

P, S

TA

PL

E E

ND

O

F F

IL

TE

R F

AB

RIC

AN

D B

AC

KF

IL

L W

IT

H N

AT

IV

E M

AT

ER

IA

L

CH

EC

K D

AM

OR

IE

NT

T

HE

S

EW

N E

DG

E O

F T

HE

C

HE

CK

D

AM

N

TO

WA

RD

T

HE

U

PS

TR

EA

M S

ID

E

ST

AP

LE

S (T

YP

.)

8" M

IN

. L

EN

GT

H

S

EC

TIO

N B

IS

OM

ET

RIC

V

IE

W

RE

AR

A

PR

ON

FR

ON

T A

PR

ON

BA

CK

O

F D

IT

CH

(T

YP

.)

F

L

O

W

A

B

GEOTEXTILE ENCASED CHECK DAM

EC - 140

SEPT 2019

K.H.

6" MIN. END OVERLAP

STAPLE OVERLAPS

EXTEND BLANKET 2 FEET BEYOND TOE OF SLOPE,

TURN THE END UNDER 4" & STAPLE @ 12" INTERVALS.

MIN. 6"

EDGE OVERLAP

ANCHOR TOP 12 INCHES

OF BLANKET IN 6" x 6" TRENCH

AND STAPLE AT 12" INTERVALS.

EXTEND BLANKET FAR ENOUGH

OVER CREST OF SLOPE TO

PREVENT UNDERCUTTING.

INITIAL CHANNEL ANCHOR TRENCH

12

"

EROSION CONTROL BLANKET-SLOPE INSTALLATION

EC - 150

SEPT 2019

K.H.

LONGITUDINAL ANCHOR TRENCH TERMINAL SLOPE & CHANNEL ANCHOR TRENCH

6"

12"

6"

INITIAL CHANNEL ANCHOR TRENCH INTERMITTENT CHECK SLOT

12"

6"

6"

STAKE @ 3'-5'

INTERVALS.

C

H

A

N

N

E

L

B

O

T

T

O

M

CHECK SLOT @ 25' INTERVALS

ISOMETRIC VIEW

EROSION CONTROL BLANKET-CHANNEL INSTALLATION

EC - 155

SEPT 2019

K.H.

INTERCEPTOR DIKE

12" MIN.

STANDARD FLARED

END SECTION

PROVIDE RIPRAP PAD

OR EQUIVALENT ENERGY

DISSIPATION

CPEP, HDPE OR EQUIVALENT PIPE

DIKE MATERIAL COMPACTED

90% MODIFIED PROCTOR

1. USED TO DIVERT RUNOFF AWAY FROM BARE SOIL AREAS ON SLOPES.

2. USE DIVERSION DIKES OR SWALES TO COLLECT WATER AT THE TOP OF SLOPE.

3. THRUST BLOCKS SHALL BE INSTALLED ANYTIME 90 DEGREE BENDS ARE UTILIZED.

4. PIPE SHALL BE SECURED ALONG ITS ENTIRE LENGTH TO PREVENT MOVEMENT. INSTALL

STEEL "T" POSTS ON BOTH SIDES OF PIPE AND WIRE PIPE TO POSTS. POSTS SHALL HAVE A

MINIMUM SPACING OF 20 FEET.

5. INLET AND ALL SECTIONS MUST BE SECURELY FASTENED TOGETHER, FUSED OR HAVE

GASKETED WATERTIGHT FITTINGS.

6. DISCHARGE TO A STABILIZED STABILIZED OUTLET.

7. INSPECT ONCE PER WEEK AND WITHIN 24 HOURS FOLLOWING A 0.5 INCH RAIN EVENT.

CHECK FOR CLOGGING AND UNDERCUTTING OF THE INLET. OUTLET SHALL BE FREE OF

EROSION.

8. REFER TO BMP C204 IN VOLUME II OF THE STORMWATER MANAGEMENT MANUAL FOR

WESTERN WASHINGTON FOR MORE INFORMATION.

NOTES:

PROVIDE RIPRAP PAD

OR EQUIVALENT ENERGY

DISSIPATION

PIPE SLOPE DRAIN

EC - 170

SEPT 2019

K.H.

L

E

N

G

T

H

V

A

R

I

E

S

1

2

"

M

I

N

I

M

U

M

O

V

E

R

L

A

P

(

T

Y

P

.

)

S

P

A

C

I

N

G

3

6

"

O

.

C

.

CONTOUR LINE (TYP.)

ANGLE TERMINAL END UPHILL 24" TO 48"

TO PREVENT FLOW AROUND WATTLE

(TYP.)

2" × 2" × 24" WOODEN

STAKE (TYP.)

STAGGER OVERLAPS (TYP.)

3'-4'

STRAW ROLLS MUST

BE PLACED ALONG

SLOPE CONTOURS

1

0

'

-

2

5

'

SEDIMENT, ORGANIC MATTER,

AND NATIVE SEEDS ARE

CAPTURED BEHIND THE ROLLS.

SPACING DEPENDS ON

SOIL TYPE AND SLOPE

STEEPNESS

LIVE STAKE

1" X 1" STAKE

4

"

-

5

"

8"-10" DIAMETER

STRAW WATTLES

EC - 180

SEPT 2019

K.H.

PLASTIC COVERING/SHEETING

EC - 190

SEPT 2019

K.H.

WASHOUT STRUCTURE WITH WOOD PLANKS

EXCAVATED WASHOUT STRUCTURE

CONCRETE WASHOUT

EC - 200

SEPT 2019

K.H.