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7

2

7

1

6

4

MAINTENANCE ROAD

SEE GENERAL DETAILS

OUTLET STRUCTURE

SEE OUTLET STRUCTURE DETAILS

TRICKLE CHANNEL

SEE GENERAL DETAILS

FOREBAY

SEE FOREBAY DETAILS

FOREBAY

SEE FOREBAY DETAILS

MAINTENANCE ROAD,

SEE GENERAL DETAILS

EMERGENCY SPILLWAY

65

62

6

0

6

0

6

3

6

4

6

2

6

0

5

9

6

4

5

7

6

5

100-YR WS

6

6

6

7

6

8

6

9

5

7

7

0

60

59

6

5

70

5

7

56

5

8

5

9

6

0

6

1

6

2

6

5

6

5

6

6

6

4

6

4

6

3

6

2

6

1

EURV WS

5

5

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WQ WS

IN

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EXTENDED DETENTIONBASIN 1 OF 1

EXAMPLE PLAN

DESIGN NOTES:1. IT IS THE RESPONSIBILITY OF THE DESIGN ENGINEER TO SIZE, DESIGN AND DETAIL ALL

EDB STRUCTURES, INCLUDING REINFORCING STEEL GRATING, ORIFICE PLATE, WELLSCREEN, HINGED OPENING FOR ACCESS AND ALL METAL WORK CONNECTIONS.

2. A STANDARD EDB MAY BE USED FOR SITES WITH A TRIBUTARY AREA OF 5 ACRES UP TO 1SQUARE MILE.

3. EDB MAY PROVIDE WQCV AND FULL-SPECTRUM DETENTION (EURV AND 100-YEAR) IN ASINGLE FACILITY, OR THESE MAY BE SPLIT BETWEEN SEPARATE FACILITIES.

4. ACCESS IS REQUIRED TO FOREBAY, OUTLET AND SPILLWAY. SEE MAINTENANCE ACCESS ONTHE GENERAL DETAILS SHEET.

5. FOREBAY, TRICKLE CHANNEL AND MICROPOOL MUST ALL BE CONCRETE (NOT VEGETATEDOR SOFT BOTTOMED).

6. THE MINIMUM TRICKLE CHANNEL LONGITUDINAL SLOPE IS 0.5%.

7. THE DISTANCE BETWEEN THE INLET(S) AND OUTLET SHALL BE MAXIMIZED TO MINIMIZESHORT CIRCUITING. THE BASIN LENGTH (MEASURED ALONG THE FLOW PATH FROM THEINLET TO THE OUTLET) TO WIDTH RATIO SHOULD BE A MINIMUM OF 2:1.

8. OVERFLOW EMBANKMENT (EMERGENCY SPILLWAY) SHALL BE DESIGNED PER USDCMCHAPTER 12.

9. THE OUTLET STRUCTURE SHALL BE LOCATED IN THE EMBANKMENT OF THE EDB. THEMICROPOOL SHALL BE DIRECTLY IN FRONT OF OR INTEGRATED WITH THE STRUCTURE (SEEOUTLET STRUCTURE DETAILS).

10. PROVIDE AN INITIAL SURCHARGE VOLUME ABOVE THE MICROPOOL FOR FREQUENTEVENTS (SEE OUTLET STRUCTURE DETAILS).

11. HANDRAIL IS RECOMMENDED FOR USE ADJACENT TO COARSE GRATING AND/OR WHEREPEDESTRIAN TRAFFIC IS IN CLOSE PROXIMITY TO THE OUTLET STRUCTURE. IT IS THERESPONSIBILITY OF THE DESIGN ENGINEER TO DETERMINE WHETHER HANDRAIL IS TO BEUSED.

12. THE WELL SCREEN MAY BE OMITTED FROM THE OUTLET STRUCTURE IF THE CONTROLORIFICES ARE 2.5 INCHES IN DIAMETER OR 2 INCHES SQUARE OR GREATER.

13. EDBS SHALL BE VEGETATED WITH SEMSWA'S STANDARD SEED MIXES. ROCK AND MULCHARE NOT PERMITTED WITHIN AN EDB. SHRUBS AND TREES MAY BE PLANTED ABOVE THEEURV WATER SURFACE.

14. OUTLET MODIFICATION AND FLOOD HAZARD WARNING SIGNS SHALL BE PROVIDED ANDMEET THE REQUIREMENTS ON THE GENERAL DETAILS SHEET.

CONSTRUCTION NOTES: (INCLUDE ON CONSTRUCTION DRAWINGS)1. TEMPORARY IRRIGATION IS REQUIRED FOR ALL EDBS TO AID IN ESTABLISHING

VEGETATION. IRRIGATION HEADS SHALL BE PLACED ABOVE THE EURV AND LOCATED TOENSURE COMPLETE COVERAGE.

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DescriptionDateNo.Standard Plan Revision

6924 S. LIMA ST.

CENTENNIAL, CO 80112

PHONE (720) 874-6500

FAX (720) 874-6611

SCALE:REFERENCE:

SHEET

EMERGENCY SPILLWAY

PATH OVER CURB ONTO

EXISTING ROADWAY

(SHOWN AS EXAMPLE)

OUTLET STRUCTURE

SEE OUTLET STRUCTURE DETAILS

OUTLET PIPE

ENTRANCE

PIPE

FOREBAY

SEE FOREBAY DETAILS

100-YR WS

TRICKLE CHANNEL

SEE GENERAL DETAILS

BUILDING

PAD

EURV WS

WQ WS

O

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DescriptionDateNo.Standard Plan Revision

6924 S. LIMA ST.

CENTENNIAL, CO 80112

PHONE (720) 874-6500

FAX (720) 874-6611

SCALE:REFERENCE:

SHEETMODIFIED EXTENDEDDETENTION BASIN 1 OF 1

EXAMPLE PLAN 1

DESIGN NOTES:1. IT IS THE RESPONSIBILITY OF THE DESIGN ENGINEER TO SIZE, DESIGN AND DETAIL ALL MEDB STRUCTURES,

INCLUDING REINFORCING STEEL GRATING, ORIFICE PLATE, WELL SCREEN, HINGED OPENING FOR ACCESS ANDALL METAL WORK CONNECTIONS.

2. A MODIFIED EDB (MEDB) MAY BE USED FOR SITES WITH A TRIBUTARY AREA GREATER THAN 1 ACRE AND LESSTHAN 5 ACRES.

3. MEDB MAY PROVIDE WQCV AND FULL-SPECTRUM DETENTION (EURV AND 100-YEAR) IN A SINGLE FACILITY, ORTHESE MAY BE SPLIT BETWEEN SEPARATE FACILITIES.

4. A HARD SURFACE MAINTENANCE ACCESS IS REQUIRED TO THE MEDB OUTLET STRUCTURE VIA SIDEWALK,PARKING LOT OR OTHER FORMALIZED PATH.

5. FOREBAY AND MICROPOOL MUST BE CONCRETE. A MEDB TRICKLE CHANNEL MAY BE CONCRETE OR VEGETATED.CONCRETE TRICKLE CHANNELS SHALL BE CONSTRUCTED AT A MINIMUM LONGITUDINAL SLOPE OF 0.5%.VEGETATED TRICKLE CHANNELS ARE ONLY ALLOWED IN STABLE TRIBUTARY AREAS AND MUST BE CONSTRUCTEDWITH A 1.5-FOOT DEPTH IN ACCORDANCE WITH VOLUME 3 OF THE USDCM.

6. THE DISTANCE BETWEEN THE INLET(S) AND OUTLET SHALL BE MAXIMIZED TO MINIMIZE SHORT CIRCUITING. THEBASIN LENGTH (MEASURED ALONG THE FLOW PATH FROM THE INLET TO THE OUTLET) TO WIDTH RATIO SHOULDBE A MINIMUM OF 2:1.

7. OVERFLOW EMBANKMENT (EMERGENCY SPILLWAY) SHALL BE DESIGNED PER USDCM CHAPTER 12.

8. THE OUTLET STRUCTURE SHALL BE LOCATED IN THE EMBANKMENT OF THE MEDB. THE MICROPOOL SHALL BEDIRECTLY IN FRONT OF OR INTEGRATED INTO THE STRUCTURE (SEE OUTLET STRUCTURE DETAILS).

9. PROVIDE AN INITIAL SURCHARGE VOLUME ABOVE THE MICROPOOL FOR FREQUENT EVENTS (SEE OUTLETSTRUCTURE DETAILS).

10. HANDRAIL IS RECOMMENDED FOR USE ADJACENT TO COARSE GRATING AND/OR WHERE PEDESTRIAN TRAFFIC ISIN CLOSE PROXIMITY TO THE OUTLET STRUCTURE. IT IS THE RESPONSIBILITY OF THE DESIGN ENGINEER TODETERMINE WHETHER HANDRAIL IS TO BE USED.

11. THE WELL SCREEN MAY BE OMITTED FROM THE OUTLET STRUCTURE IF THE CONTROL ORIFICES ARE 2.5 INCHES INDIAMETER OR 2 INCHES SQUARE OR GREATER.

12. MEDBS SHALL BE VEGETATED WITH SEMSWA'S STANDARD SEED MIXES. ROCK AND MULCH ARE NOT PERMITTEDWITHIN A MEDB. SHRUBS MAY BE PLANTED ABOVE THE EURV WATER SURFACE AND TREES ABOVE THE 100-YEARWATER SURFACE.

13. OUTLET MODIFICATION AND FLOOD HAZARD WARNING SIGNS SHALL BE PROVIDED AND MEET REQUIREMENTSON THE GENERAL DETAILS SHEET.

CONSTRUCTION NOTES: (INCLUDE ON CONTRUCTION DRAWINGS)1. PERMANENT IRRIGATION IS REQUIRED FOR ALL MEDBS. IRRIGATION HEADS SHALL BE PLACED ABOVE THE EURV

AND LOCATED TO ENSURE COMPLETE COVERAGE.

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FOREBAY PLAN

E

E

GROUT TOEWALL

TRICKLE

CHANNEL

2" MIN GAP

TO DRAIN

FOREBAY

REINFORCED

GROUT SLAB

FLARED

END

SECTION

NON-REINFORCED

GROUT

RCP

D

D

D50=12"

SOIL-RIPRAP

10:1

12' M

IN.

AC

CE

SS

RA

MP

N.T.S.

OUTFLOW

INFLOW

RCP

8"

SECTION D

D50 = 12" SOIL

RIPRAP ADJACENT

TO LOW FLOW

CHANNEL

6" MIN CDOT CLASS

A FILTER MATERIAL

NON-REINFORCED

GROUT TOEWALL,

TO BE DESIGNED

BY ENGINEER

FLARED END SECTION (FES)

FINISHED GRADE

DEPRESS SLAB 6" BELOW

FES (SLOPE AT 1:1)

IMPACT BOULDER

6'

6" MIN

REINFORCED

GROUT SLAB

N.T.S.

TOP OF TRICKLE

CHANNEL CURB

TRICKLE

CHANNEL

INVERT

INFLOW

SECTION E

GROUT

6" MIN REINFORCED

GROUT SLAB

DEPRESS GROUT TO

DIRECT INTIAL OVERFLOWS

INTO TRICKLE CHANNEL

FORM GROVES IN

RAMP FOR TRACTION

GROUT DEPTH AS REQUIRED TO

PROVIDE REQUIRED VOLUME

2" MIN GAP TO

DRAIN FOREBAY

FOREBAY EDGE

BOULDER, TYP.

GROUT PROFILE

N.T.S.

6" MIN CDOT CLASS

A FILTER MATERIAL

SECTION

6" MIN CDOT CLASS

A FILTER MATERIAL

ACCESS RAMP CONSTRUCTED

WITH FILL CONCRETE

(BEYOND)

RCP

FINISHED

GRADE

A

2" MIN GAP

TO DRAIN

FOREBAY

D

50

= 12"

SOIL RIPRAP

MAINTENANCE

ACCESS ROAD

RCP

ACCESS RAMP

CONSTRUCTED WITH

FILL CONCRETE

TRICKLE

CHANNEL

TOP OF TRICKLE

CHANNEL CURB

TRICKLE CHANNEL

INVERT

2" MIN GAP GAP TO

DRAIN FOREBAY

DEPRESS CONCRETE 6" BELOW

RCP INVERT ELEVATION (SLOPE AT 1:1)

TRANSITION FROM HEIGHT

OF FOREBAY TO HEIGHT OF

TRICKLE CHANNEL CURB

12' MIN.

INFLOW A

A

CONCRETE WALL

(BEYOND)

FOREBAY PLAN

10:1 M

AX

ENERGY

DISSIPATION

WALL

D

3/4 D

N.T.S.

N.T.S.

4 MAX

1

2/3 D

8" (MIN)

INFLOW

D

OUTFLOW

8" (MIN.)

2/3 D

6" REINFORCED

GROUT SLAB

PIPE

BB

BOULDER (TYP.)

C

C

(D50=12")

SOIL RIPRAP

FOREBAY PLAN

TRICKLE

CHANNEL

OU

TF

LO

W

INFLOW

N.T.S.

FINISHED GRADE

PIPE

6" MIN. REINFORCED GROUT SLAB

6" MIN. CDOT CLASS

A FILTER MATERIAL

SECTION B

DEPRESS SLAB 6" BELOW

PIPE INVERT (SLOPE AT 1:1)

NON-REINFORCED

GROUT TOE WALL TO BE

DESIGNED BY ENGINEER

TOP OF TRICKLE

CHANNEL CURB

TRICKLE CHANNEL

INVERT

INFLOW

N.T.S.

8"

SECTION C

6" MIN. REINFORCED

GROUT SLAB

DEPRESS GROUT TO

DIRECT INTIAL OVERFLOWS

INTO TRICKLE CHANNEL

GROUT DEPTH AS

REQUIRED TO PROVIDE

REQUIRED VOLUME

2" MIN.GAP TO

DRAIN FOREBAY

FOREBAY EDGE

BOULDER, TYP.

GROUT PROFILE

N.T.S.

6" MIN. CDOT CLASS

A FILTER MATERIAL

DescriptionDateNo.Standard Plan Revision

6924 S. LIMA ST.

CENTENNIAL, CO 80112

PHONE (720) 874-6500

FAX (720) 874-6611

SCALE:REFERENCE:

SHEETFOREBAY DETAILS1 OF 1

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FOREBAY DESIGN NOTES:1. CONCRETE FOREBAY SHOWN INCLUDES ACCESS RAMP AS REQUIRED FOR STANDARD EDBS.

THIS DETAIL SHALL BE MODIFIED AS APPROPRIATE FOR MODIFIED EDBS, INCLUDINGREMOVAL OF THE ACCESS RAMP.

2. IT IS THE RESPONSIBILITY OF THE DESIGN ENGINEER TO SIZE FOREBAY AND OUTLET NOTCH(GAP) IN ACCORDANCE WITH USDCM VOLUME 3.

3. OUTLET NOTCH SHALL EXTEND TO BOTTOM ELEVATION OF FOREBAY TO ALLOW FOREBAYTO COMPLETELY DRAIN.

4. ALL CONCRETE SHALL BE REINFORCED, CAST-IN-PLACE AND DESIGNED BY A REGISTEREDPROFESSIONAL ENGINEER. THE ENGINEER SHALL DESIGN AND DETAIL CONCRETETHICKNESS, REBAR AND COLD JOINT CONNECTIONS (WHEN MULTIPLE CONCRETE POURSARE REQUIRED).

5. ALL DIMENSIONS PROVIDED ON DETAILS SHALL BE CONSIDERED MINIMUMS.

CONCRETE LINED FOREBAYN.T.S.

MEDB - BOULDER LINED FOREBAYN.T.S.

EDB BOULDER LINED FOREBAYN.T.S.

4'-0

"

100-YR

ORIFICE

PLATE

STANDARD

BAR GRATING

MANHOLE STEPS

GRATING PANEL

RESTRAINTS

18" THICK TYPE L (D50 = 9")

SOIL RIPRAP

A

CONCRETE LOW

FLOW CHANNEL

A

FLOW

3'-0" MAX

PANEL WIDTH

8" GAP COVERED

WITH HINGED

STEEL PLATE.

OUTLET STRUCTURE PLAN

N.T.S.

PROVIDE HINGED OPENING

FOR ACCESS TO STRUCTURE

PROVIDE HINGED

OPENING FOR ACCESS

TO STRUCTURE

STANDARD BAR

GRATING (1" x 4"

NOMINAL OPENINGS)

COARSE BAR

GRATING

(BARS @ 6"

CENTERS)

SECTION A

WELL SCREEN

MANHOLE STEPS

POND

BOTTOM

ELEV.

ORIFICE PLATE

(LOWEST ORIFICE AT

TOP OF MICROPOOL).

ORIFICE PLATE SIZED

FOR 40-HR RELEASE OF

WQCV AND MAX. 72 HR

RELEASE OF EURV.

MICROPOOL WATER

SURFACE

EURV WATER

SURFACE

100-YR WATER

SURFACE

100-YR

ORIFICE

PLATE

OUTLET

PIPE

INITIAL SURCHARGE ZONE

4" MIN.

2.5' DEEP

MICROPOOL

4

1

CONCRETE

TRICKLE

CHANNEL

CONCRETE RAMP

FOR EGRESS

100-YR

OUTLET

WQCV WATER

SURFACE

8" GAP IN GRATING TO ALLOW ACCESS

TO CLEAR WELL SCREEN. INSTALL

STEEL PLATE OVER OPENING WITH

HINGES AND HANDLE FOR ACCESS

TOP OF TRICKLE

CHANNEL CURB

N.T.S.

4'-0"

B

4

1

MANHOLE

STEPS

MANHOLE

STEPS

FLOW

INITIAL SURCHARGE

WATER SURFACE

MICROPOOL

WATER SURFACE

HANDRAIL

HANDRAIL

EURV WATER SURFACE

100-YR WATER SURFACE

1

3 OR FLATTER

(ABOVE

100-YR WS)

4" MIN.

2'-6" MIN.

100-YR OUTLET

8" GAP IN GRATING TO ALLOW

ACCESS TO CLEAR WELL

SCREEN. INSTALL STEEL PLATE

OVER OPENING WITH HINGES

AND HANDLE FOR ACCESS.

WQCV WATER SURFACE

WELL SCREEN

100-YR

ORIFICE

PLATE

OUTLET

PIPE

ORIFICE PLATE

SIZED FOR 40-HR

RELEASE OF WQCV

AND MAX. 72-HR

RELEASE OF EURV

LOWEST

OPENING

AT

MICROPOOL

WATER

SURFACE

STANDARD BAR GRATING

(1"x4" NOMINAL OPENINGS)

COARSE BAR GRATING

(BARS @ 6" CENTERS)

CDOT CLASS A

FILTER MATERIAL

CONCRETE RAMP

FOR EGRESS

TOP OF LOW FLOW

CHANNEL CURB

TRICKLE CHANNEL

INVERT

0.5% MIN.

100-YEAR OUTLET

SIZED TO MAINTAIN

FLOW CONTROL AT

100-YEAR ORIFICE

WITH APPROPRIATE

DEBRIS BLOCKAGE

CONSIDERATIONS

COARSE BAR GRATING

STANDARD

BAR GRATING

8" GAP. COVERED WITH

HINGED STEEL PLATE.

COARSE BAR

GRATING

LOW FLOW

CHANNEL

DEPRESSED INITIAL SURCHARGE

AREA PLANTED WITH VEGETATION

SUITED TO WETTER CONDITIONS

PROVIDE HINGED OPENING

FOR ACCESS TO STRUCTURE.

PROVIDE HINGED OPENING

FOR ACCESS TO STRUCTURE

SECTION B

N.T.S.

OUTLET STRUCTURE PLAN

N.T.S.

3'-0" MAX

PANEL WIDTH

B

DescriptionDateNo.Standard Plan Revision

6924 S. LIMA ST.

CENTENNIAL, CO 80112

PHONE (720) 874-6500

FAX (720) 874-6611

SCALE:REFERENCE:

SHEET

OUTLET STRUCTURE DETAILS 1 OF 1

MODIFIED EXTENDED DETENTION BASIN AND EXTENDEDDETENTION BASIN

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EDB OUTLET STRUCTUREN.T.S.

MEDB OUTLET STRUCTUREN.T.S.