40

40

45

50

55

40

40

45

45

45

45

50

50

5050

50 50

55

5555

55

55

55

55

60

60

60

60

60

60

60

60

6060

65

65

65

65

65

65

65

65

65

65

70

70

70

70

70

70

75

75

75

75

758080

80

85

85

90

90

95

CO

LO

NIA

L N

ATIO

NA

L

HIS

TO

RIC

PA

RK

WA

Y

FLOW

FLOW

3+61.43

1+00

2+003+00

INTERSTATE 64WESTBOUND

3' MINIMUM

THE UNNAMED TRIBUTARY THAT FLOWS INTO QUEENS LAKE HAS EXPERIENCED SIGNIFICANTCHANNEL DEGRADATION AND EROSION, WHICH IS CONTRIBUTING TO LOCALIZEDSEDIMENTATION AND NUTRIENT CONTRIBUTIONS TO DOWNSTREAM RECEIVING WATERS. THISCONCEPTUAL RESTORATION DESIGN INCORPORATES A PERMANENT LONG-TERM SOLUTION,THAT WILL UTILIZE NATURAL CHANNEL DESIGN (NCD) PRINCIPLES, WHERE APPROPRIATE, ANDVEGETATION THAT IS NATIVE TO THE REGION.

THE PROPOSED DESIGN USES ROSGEN'S NCD METHODOLOGY (ROSGEN, 1996), MIMICKINGSLOPES AND BED FEATURES THAT ARE FOUND IN OTHER NATURAL STREAM CHANNELS WITHSIMILAR CHARACTERISTICS.  BANKFULL CROSS-SECTIONAL AREAS OBSERVED IN THE FIELD,COUPLED WITH MODELED HYDROLOGY AND HYDRAULICS CALCULATIONS, WERE USED AS THEBASIS FOR CHANNEL SIZE.  SLOPES IN THE SYSTEM ARE PROPOSED TO BE NORMALIZED THROUGHA SERIES OF ROCK GRADE CONTROL STRUCTURES THAT WILL SPREAD THE VERTICAL DROPTHROUGHOUT THE PROJECT, RATHER THAN IN ONE LOCATION (AT THE HEADCUT).  THISRESTORATION WILL IMPROVE LOCAL HYDRAULICS AND REDUCE ENERGY AND BED EROSION. COBBLE WILL BE ADDED TO THE SYSTEM FOR VERTICAL SUPPORT AND HABITAT, AND SIDE SLOPESWILL BE GRADED GENTLY ENOUGH SO NATIVE VEGETATION CAN GROW AND FLOURISH. MATURE TREES WITHIN THE PROJECT AREA, INCLUDING THE APPROXIMATED ACCESS ROUTE(S),WILL BE AVOIDED TO THE GREATEST EXTENT PRACTICABLE, WHILE STILL ENSURING THE SUCCESSOF THE RESTORATION. 

www.stantec.com

5209 Center StreetWilliamsburg, Virginia 23188

INTERSTATE 64 & COLONIAL PARKWAY CONCEPTUAL RESTORATION PLANYORK COUNTY, VIRGINIA

PROPOSED CHANNEL CONDITION WITHINSTREAM STRUCTURES.

SECTION A-A'

WATER SURFACEELEVATION

BANKFULLWIDTH

STREA

M FLOW

A

A'

FOOTER ROCKS

NO GAPSBETWEEN ROCKS

HEADER ROCKS

HEADER ROCKS

FOOTERROCKS

SPLASH ROCKS

SPLASHROCKS

BED MIX

STREAM FLOW

BKF

BL

OUTERBANK

INNERBANK

SCOUR POOL

NTSDETAIL: TYPICAL J-HOOK WITH SILL

POOL

PLAN VIEW SECTION VIEWDETAIL: DOUBLE ROCK STEP (CONSTRUCTION DETAIL)

1' ±

1"=30'0 30' 60'15'

ILLUSTRATIVE LONGITUDINAL PROFILE - REACH 1VERTICAL SCALE: 1" = 5' HORIZONTAL SCALE: 1" = 20'

DISTANCE (FT.)

ELEVA

TION

(FT.)

30

35

40

45

55

50

60

6080100120160 140180200260 220240300 280320340360

EXISTING CHANNEL CONDITION WITHEROSION AND HEADCUT.

PROPOSED DOUBLE ROCK STEP

PROPOSED SINGLE ROCK STEP

PROPOSED J-HOOK WITH SILL

N

EXISTING VDOT LIMITED ACCESS LINE

4" - 6" COBBLE REINFORCEDBED MIX (12" DEEP)

COMPACTEDFILL

DOUBLE ROCK STEP

SINGLE ROCK STEP

EXISTINGGRADE

PROPOSEDGRADE

J-HOOK VANE WITH SILL

CLASS I RIP RAP

EXISTINGRIGHT-OF-WAY

EXISTINGRIGHT-OF-WAY

PROJECT NARRATIVE:

DETAILS

POTENTIAL RESTORATION PALETTE

RED MAPLE(ACER RUBRUM)

FLOWERING DOGWOOD(CORNUS FLORIDA)

WAX MYRTLE(MYRICA)

AMERICAN SYCAMORE(PLANTANUS OCCIDENTALIS)

SILKY DOGWOOD(CORNUS AMOMUM)

BLACK WILLOW(SALIX NIGRA)

NORTHERN RED OAK(QUERCUS RUBRA)

TULIP TREE(LIRIODENDRON)

AMERICAN HOLLY(ILEX OPACA)

AMERICAN HORNBEAM(CARPINUS CAROLINANA)

STEP ROCK: UPPER &LOWER DROP BOULDER

APPROXIMATEBANKFULL

SPLASH BOULDER/FOOTER

COMPACTED CLAYSTEP ROCK: UPPER& LOWER DROPBOULDER

SPLASH BOULDERFOOTER ROCK

EXISTING CULVERTOUTFALL 44.0 ±

EXISTING CULVERTOUTFALL 39.5 ±

EXISTING CULVERTOUTFALL 39.5±

EXISTING CULVERTOUTFALL 44.0±

PS1

STREAMFLO

W

APPROXIMATE LIMITS OF ACCESS(MATURE TREES TO BE AVOIDEDWHERE POSSIBLE)

PROPOSED LIMITS OFRESTORATION

ILLUSTRATIVE SECTION

PROPOSED BANKGRADE

CURRENT CHANNELCONDITION

REPLANTED VEGETATION(AFTER CONSTRUCTION)

COBBLESUBSTRATE

PROPOSEDCOMPACTED FILL

EXISTING VEGETATION(TO REMAIN)

EXISTING SOIL

NTS

ADDITIONAL ROCKSTEP STABILIZATION

PROPOSED ADJACENTSTORMWATER BASIN

VICINITY MAP

1"=1000'0 1000' 2000'500'

FUTURE STORMWATERBASIN BY OTHERS

N

PS1

PROJECT LOCATION