HomeMy WebLinkAboutC5.2 Erosion Control Detailsrs
0
to
0
r;
0
N
a
O
O
N
z
i
4
E
E
O
0
0
a
N
0
CZ
N
a
w
0
F-
0
L
EROSION CONTROL NOTES:
1 CONSTRUCTION ACTIVITY SHALL CONSIST OF
UTILITIES, DRAINAGE SWALES, STORM SEWERS
BASIN, BUILDING CONSTRUCTION AND PAVING
2. PRELIMINARY CONSTRUCTION SCHEDULE: EARTHWORK
SHALL BEGIN IN STU STORM
DRAINAGE STRUC RES SHALL BE CONCURRENT WITH
EARTHWORK. SANITARY SEWER INSTALLATION SHALL
COMMENCE UPON COMPLETION NUTILITYOINSTALLATION GRADING. WATER
MAINS AND REMAIN G
COMMENCE UOFINA COMPLETION
GRADING AND PAVING NG SHA�
INSTALLATION. OCCUR
AFTER THE BUILDINGS NT ANTICIPATED COMPLETION
BBY SUMMER2 05TTHIS
OF THE PROJE
SCHEDULE IS SUBJECT TO CHANGE.
3. LAND ALTERATION
A INC O INCLUDING REGRADING, D OF
VEGETATION,
SHALL BE DONE IN
A WAY THAT WILL MINIMIZE EROSION.
4. CONTRACTOR SHALL COMPLY WITH ALL STATE AND LOCAL
ORDINANCES THAT APPLY.
5. THIS PLAN SHALL NOT BE CONSIDERED ALL INCLUSIVE
AS THE CONTRACTOR SHALL TAKE ALL NECESSARY
PRECAUTIONS TO PREVENT SOIL SEDIMENT FROM LEAVING
THE SITE.
6. ADDITIONAL ERALLSEDIMENT CONTR O
SHALL BE INSTALLED IF DEEMED NECESSARY BY ON SITE
INSPECTION.
7. SEDIMENT LADEN WATER SHALL BE DETAINED BY
EROSION CONTROL PRACTICES AS NEEDED TO MINIMIZE
SEDIMENTATION IN THE RECEIVING STREAM. NO STORM
WATER SHALL BE DISCHARGED FROM THE SITE IN A MANNER
THAT CAUSES EROSION AT THE POINT OF DISCHARGE.
8. WASTES AND UNUSED BUILDING MATERIALS SHALL
NOT BE ALLOWED TO BE CARRIED FROM THE SITE BY
STORM WATER RUNOFF. PROPER DISPOSAL OF ALL WASTES
AND UNUSED BUILDING MATERIALS IS REQUIRED.
9. SEDIMENT BEING TRACKED ONTO PUBLIC OR PRIVATE
ROADWAYS SHALL BE MINIMIZED. CLEARED SEDIMENT
SHALL BE RETURNED TO THE SITE FOR DISPOSAL.
10. SOIL WHICH HAS B ACCUMULATED CONTROL
DEVICES SHALL AND RE -DISTRIBUTED STRI UTED ON
SITE AFTER EACH RAINFALL EVENT, AND AT LEAST ONCE A WEEK.
11. IF INSTALLATION TED B OF STORM
OR NIGHTFALL, THE PIPE U BE
INTERRUPTED ENDS SHALL
TED B
BE COVERED WITH FILTER FABRIC.
12. EXISTING VEGETATION SHALL BE PRESERVED IN AREAS
NOT DISTURBED BY CONSTRUCTION ACTIVITY.
13. THERE ARE NO BORROW AREAS.
14. ALL APPLICABLE EROSION CONTROL MEASURES SHALL
BE PLACED BEFORE ANY LAND DISTURBING ACTIVITIES.
15. SCHEDULE OF EROSION CONTROL ACTIVITIES:
a) INSTALL SAND BAGS AROUND INLETS IMMEDIATELY UPON
COMPLETION OF THE STRUCTURE. REMOVE SAND BAGS FOR
PAVING OPERATION. REPLACE SAND BAGS AFTER PAVING
IS COMPLETE. SAND BAGS SHALL REMAIN IN PLACE
UNTIL VEGETATION IS ESTABLISHED ON SEEDED
AREAS BEHIND THE CURB.
b) THE DURATION OF TIME WHICH AN AREA REMAINS
EXPOSED SHALL BE KEPT TO A PRACTICAL MINIMUM. THE
AREA SHALL BE STABILIZED AS SOON AS POSSIBLE.
TEMPORARY VEGETATION OR MULCHING SHALL BE USED
TO PROTECT EXPOSED AREAS IF PERMANENT VEGETATION
CANNOT BE SEEDED WITHIN 14 DAYS OR ACTIVITY
CEASES FOR MORE THAN 21 DAYS OR AS DIRECTED BY
THE ENGINEER.
c) TOPSOIL REPLACEMENT SHALL TAKE PLACE FROM
MARCH 1 TO OCTOBER 31. STOCKPILE TOPSOIL AT ALL
OTHER TIMES OF THE YEAR. PERMANENT AND FINAL
VEGETATION AND STRUCTURAL I
SHALL BE INSTALLED WITHIN SEVEN (7) DAYS AFTER FINAL
GRADING OR AS SOON AS POSSIBLE.
16. APPLY FERTILIZER AT A RATE ADEQUATE TO PROVIDE 1 LB. OF
ACTUAL NITROGEN PER 1,000 SQUARE FEET. USE COMMERCIAL
GRADE COMPLETE FERTILIZER i�OGEN, 50 PERCEN�DERIVED FROM
OF FAST AND SLOW RELEASE N
NATURAL ORGANIC SOURCES OF UREA -FORM, PHOSPHOROUS, AND
IN FOLLOWING COMPOSITION:
a) FERTILIZER FOR LAWNS: PROVIDE A FAST RELEASE SQ. FT. OF
FERTILIZER WITH A COMPOSITION OF 1 LB PER 1, 0
ACTUAL NITROGEN, 4 PERCENT PHOSPHOROUS, AND 2 PERCENT
POTASSIUM BY WEIGHT
b) SLOW- RELEASE FERTILIZER FOR TREES AND SHRUBS:
GRANULAR FERTILIZER CONSISTING OF 50 PERCENT
NITROGEN, PHOSPHOROUS AND POTASSIUM MADE UP O
COMPOSITION BY WEIGHT OF 5 PERCENT
17. ADD LIME TO TOPSOIL TO OBTAIN A pH RANGE OF
6.0 TO 7.0. LIME SHALL BE ASTM C 602, CLASS T, AGRICULTURAL
LIMESTONE CONTAINING A MINIMUM OF 80 PERCENT CALCIUM CARBONATE
EQUIVALENT, WITH A MINIMUM 99 PERCENT 50 (250 MICROMETER)
SIEVE AND A MINIMUM 75 PERCENT PAS SING A
SIEVE.
18. CONSTRUCTION TRAFFIC SHALL ENTER THE SITE AT DRIVES WHICH ARE
CURRENTLY PAVED.
The Catch is an inlet and catch basin filtration device developed to prevent sedimentation.
Catch are available to fit virtually any drainage structure casting, and could represent a
Best Management Practice for your EPA Phase 2 Program.
sTEEL ERA SE OVER LOW Temporary Installation: Construction
AThR projects on highways and new housing
developments can result in substantial
amounts of sediment during a rainstorm.
Traditional practice, using silt screens, hay
bales, and filter fabric under storm grates
provide only limited protection. Catch-All
will hold 2 cubic feet of gravel, silt, and
debris, and can be moved from site -to site
i OR EASY y t� STAINLESS STEEL LAND
(flamed two bag) 's 'r .��Jx =are l� s
POLYESTER NIESII
REINFORCEMENT
(Outer Layer)
POLYPROPYLENE GEOTI x
FILTER FABRIC
(Inner Layer)
Nutec Starmivater Services
6439 East 30 street
Indianapilis, IN 46219
800 969-6883
A I)Lvlslofl of Nutec Supply
Catch has been approved for use on many
IDOT road construction projects. R
Permanent Installation: Commercial and
industrial sites with impervious surfaces, such ar
roads and parking lots, produce stormwater run -off that may include paper refuse, cigarettes,
sediment, and even some floating oils. These contaminants can quickly add up to a significant
amount in catch basins or municipal systems. Without proper treatment, stormwater laden with
such materials can pollute streams, lakes, and near -shore waters.
The unique design of the reusable steel frame of Catch provides an overflow capacity
greater than the open area of the grate it fits under. This means little chance for water to back up
or pool, even between scheduled cleanings. The durable, reinforced sediment bag can be cleaned
numerous times and is easily replaced in the field. The entire unit is installed below grade and no
rebar, clips, or straps are exposed on the surface. With a top flange less than 1/8" thick, the
additional height exposure of the grate is minimal. Catch can be an important supplement
for catch basins and underground stormwater storage systems that are usually difficult to access
for cleaning. Catch are available to fit virtually any drainage structure casting.
GENERAL NOTES'
FRAME. Top flange fabricated from IYix1WAr angle. Base rtn
fabricated from IJ 'xlf'x16' channel. Handles and suspension brackets
fabricated from IWxY: flat stock- Ali domestic steel conforming to
ASTM -A35.
SEDIMENT BAG Bag fabricated from 4 oz./s4Yd. non -woven
polypropylene geotextile reinforced with polyester mesh. Bag
secured to base rim with a stainless steel strop and Lock.
GENERAL NOTES
FRAME Top flange fabricated from IhNlYex/fr angle. Bose rim
fabricated from 11¢'xlf'xW channel. Handles and suspension brsckets
fabricated from l xWY flat stock. All domestic steel conformhg to
ASTM -A36.
SEDIMENT BAG. Bag fabricated from 4 ozJsq.yd non-woven
polypropylene
ecuur d to base rim with a reinforced ainl ss steel 8
and lock.
INLET BASKET MAINTENANCE REQUIREMENTS
1. INSPECT THE STRUCTURE AFTER EACH STORM EVENT, REMOVING SEDIMENT AND MAKING NEEDED
REPAIRS IMMEDIATELY.
2. WHEN THE CONTRIBUTING DRAINAGE AREA HAS BEEN STABILIZES, REMOVE AND PROPERLY DISPOSE OF
ANY UNSTABLE SEDIMENT AND CONSTRUCTION MATERIAL, AND RE- STABILIZE.
3. FOLLOW MANUFACTURER'S RECOMMENDATIONS FOR INSTALLATION AND MAINTENANCE.
FILTER FABRIC
NON WOVEN
GEOTEXTILE
FABRIC
FLOW
1 a
I I I __l
EXTEND FABRIC
WIRE TO 4" BELOW
SURFACE
WIRE
WOOD POST
SILT FENCE CONSTRUCTION
NOT TO SCALE
NOTE:
POSTS SHALL HAVE A MINIMUM LENGTH OF
36 INCHES PLUS BURIAL DEPTH. POST MATERIAL
SHALL BE WOOD, STEEL, OR SYNTHETIC, AND SHALL
BE OF SUFFICIENT STRENGTH TO RESIST DAMAGE
DURING INSTALLATION AND TO SUPPORT APPLIED
LOADS.
FABRIC SHALL BE A WOVEN GEOTEXTILE FABRIC
CONSISTING OF STRONG, ROT RESISTANT,
MATERIALS RESISTANT TO DETERIORATION FROM
ULTRAVIOLET AND HEAT EXPOSURE.
SILT FENCE INSTALLATION REQUIREMENTS
SITE PREPARATION
1. PLAN FOR THE FENCE TO BE AT LEAST 10 ft. FROM THE TOE OF THE SLOPE TO PROVIDE A SEDIMENT STORAGE
AREA.
2. PROVIDE ACCESS TO THE AREA IF SEDIMENT CLEANOUT WILL BE NEEDED.
OUTLET CONSTRUCTION (OPTIONAL)
1. DETERMINE THE APPROPRIATE LOCATION FOR A REINFORCED, STABILIZED BYPASS FLOW OUTLET (UNLESS
THE FENCE IS DESIGNED TO RETAIN ALL RUNOFF FROM A 2 YEAR FREQUENCY, 24 HR DURATION STORM EVENT)
2. SET THE OUTLET ELEVATION SO THAT WATER DEPTH CANNOT EXCEED 1 %229 ft. AT THE LOWEST POINT
ALONG THE FENCE LINE.
3. LOCATE THE OUTLET WEIR SUPPORT POSTS NO MORE THAN 4 ft. APART, AND INSTALL A HORIZONTAL BRACE
BETWEEN THEM. (WEIR HEIGHT SHOULD BE NO MORE THAN 1 ft. DEEP, 5 ft. WIDE, AND F ft. LONG ON LEVEL GRADE.
4. EXCAVATE THE FOUNDATION FOR THE OUTLET SPLASH PAD TO MINIMUMS OF 1 ft. AND WATER DEPTH NO MORE
THAN 1 1 /2 ft. ANYWHERE ELSE ALONG THE FENCE.)
5. FILL THE EXCAVATED FOUNDATION WITH INDOT CA NO. 1 STONE, BEING CAREFUL THAT THE FINISHED SURFACE
BLENDS WITH THE SURROUNDING AREA, ALLOWING NO OVERFILL.
6. STABILIZE THE AREA AROUND THE RAD.
FENCE CONSTRUCTION
1. ALONG THE ENTIRE INTENDED FENCE LINE, DIG AN 8 in. DEEP FLAT BOTTOMED OR V- SHAPED TRENCH.
2. ON THE DOWNSIDE SLOPE OF THE TRENCH, DRIVE THE WOOD OR STEEL SUPPORT POSTS AT LEAST 1 ft. INTO THE
GROUND (THE DEEPER THE BETTER!), SPACING THEM NO MORE THAN 8 ft. APART IF THE FENCE IS SUPPORTED BY
WIRE OR 6 ft. IF EXTRA STRENGTH rABRIC IS USED WITHOUT SUPPORT WIRE. ADJUST SPACING, IF NECESSARY, TO
ENSURE THAT POSTS ARE SET AT THE LOW POINTS ALONF THE FENCE LINE. (NOTE: IF THE FENCE HAS PRE ATTACHED
POSTS OR STAKES, DRIVE THEM DEEP ENOUGH SO THE FABRIC IS SATISFACTORILY IN THE TRENCH AS DESCRIBED
IN STEP 6).
3. FASTEN SUPPORT WIRE FENCE (IF THE MANUFACTUER RECOMMENDS ITS USE) TO THE UPSLOPE SIDE OF THE POSTS,
EXTENDING IT 8 in. INTO THE TRENCH.
4. RUN A CONTINUOUS LENGTH OF GEOTEXTILE FABRIC IN FRONT (UPSLOPE) OF THE SUPPORT WIRE AND POSTS,
AVOIDING JOINTS, PARTICULARLY AT LOW POINTS IN THE FENCE LINE.
5. IF A JOINT IS NECESSARY, NAIL THE OVERLAP TO THE NEAREST POST WITH LATH.
6. PLACE THE BOTTOM 1 ft. OF FABRIC IN THE 8 in. DEEP TRENCH, EXTENDING THE REMAING 4 in. TOWARD THE
UPSLOPE SIDE.
7. BACKFILL NE TRENCH WITH COMPACTED EARTH OR GRAVEL.
NOTE: IF USING A PRE PACKED COMMERCIAL SILT FENCE RATHER THAN CONSTRUCTING ONE, FOLLOW MANUFACTURER'S
INSTALLATION INSTRUCTIONS.
SILT FENCE MAINTENANCE REQUIREMENTS
1. INSPECT THE SILT FENCE PERIODICALLY AND AFTER EACH STORM EVENT.
2. IF FABRIC TEARS, STARTS TO DECOMPOSE, OR IN ANY WAY BECOMES INEFFECTIVE, REPLACE THE AFFECTED
PORTION IMMEDIATELY.
3. REMOVE DEPOSITED SEDIMENT WHEN iT REACHES HALF THE HEIGHT OF THE FENCE AT ITS LOWEST POINT
OR IS CAUSING THE FABRIC TO BULGE.
4. TAKE CARE TO AVOID UNDERMINING THE FENCE DURING CLEAN OUT.
5. AFTER THE CONTRIBUTING DRAINAGE AREA HAS BEEN STABILIZED REMOVE THE FENCE AND SEDIMENT
DEPOSITS, BRING THE DISTURBED AREA TO GRADE, AND STABILIZE.
z
t•
CHANNEL SLOPE
SHALL BE 0.3%
GRADE (min.)
NORTH AMERICAN
GREEN S75 EROSION
CONTROL MAT
STAPLE PATTERN C
DIVERSION SWALE MAINTENANCE REQUIREMENTS
1. INSPECT DIVERSION SWALES FOLLOWING STORM EVENTS DURING AND AFTER VEGETATIVE ESTABLISHMENT;
MAKE NEEDED REPAIRS IMMEDIATELY.
2. CHECK DITCH OUTLET AND ROAD CROSSINGS FOR BLOCKAGE, SEDIMENT, BANK INSTABILITY AND PIPING
OR SCOUR HOLES; REMOVE ANY BLOCKAGE, AND MAKE PIPING REPAIRS IMMEDIATELY.
3. REMOVE SIGNIFICANT SEDIMENT AND DEBRIS FROM THE CHANNEL TO MAINTAIN DESIGN CROSS- SECTION
AND GRADE AND TO PREVENT SPOT EROSION.
4. TEMPORARY ROCK CHECK DAMS SHALL BE CONSTRUCTED EN CONDIRIONSR TEMPORARY ROCK CHECK DAMS,
BE ESTABLISHED DUE TO WEATHER OR OTHER UNFORESEEN
IF REQUIRED SHALL BE REMOVED ONLY WHEN THE CONTRIBUTING DRAINAGE AREA HAS BEEN STABILIZED.
DIVERSION SWALE DETAIL
NOT TO SCALE
NOTE:
SEE EROSION CONTROL
MAT DETAIL sheet C5.3
FOR ADDITIONAL
INFORMATION
1
CLEAN -OUT LEVEL
SET STAKE AT
GRAVEL
FACE
2' (MIN)
SEDIMENT TRAP SPILLWAY INSTALLATION REQUIREMENTS
EMBANKMENT:
1. LOCATE THE TRAP AS NEAR THE SEDIMENT SOURCE AS TOPOGRAPHY ALLOWS.
2. DIVERT RUNOFF FROM ALL DISTURBED AREAS AWAY FROM THE TRAP SITE.
3. CLEAR, GRUB, AND STRIP ALL VEGETATION AND ROOT MAT FROM THE EMBANKMENT AREA.
4. USING STABLE MINERAL SOIL FREE OF ROOTS, ROCKS, BRUSH AND DEBRIS, PLACE FILL IN 9 -in. LIFTS (MAX.)
5. COMPACT EACH LIFT SO THE SIDE SLOPES ARE 2:1 OR FLATTER (3:1 RECOMMENDED FOR BACKSLOPE TO IMPROVE
STABILITY OF STONE SPILLWAY).
6. OVERFILL THE EMBANKMENT TO 6 in. ABOVE THE DESIGN ELEVATION TO ALLOW FOR SETTLING.
OUTLET SECTION:
1. EXCAVATE A TRAPEZOIDAL STONE OUTLET SECTION FROM THE COMPACTED EMBANKMENT.
2. INSTALL GEOTEXTILE FABRIC, EXTENDING IT UP THE SIDES TO THE TOP OF NE EMBANKMENT.
3. PLACE SPECIFIES STONE TO THE LINES AND GRADES, WORKING SMALLER STONES INTO VOIDS TO ACHIEVE A DENSE
MAS. THE SPILLWAY CREST SHOULD BE LEVEL WITH THE WIDTH SPECIFIED (MIN. 4 ft.); SPILLWAY DEPTH SHOULD
BE 1 /2 ft. MINIMUM, MEASURED FROM THE HIGHEST STONES IN THE SPILLWAY TO NE TOP OF THE DAM.
4. KEEP THE BASE OF THE OUTLET STONE SECTION AT LEAST 2 ft. THICK THROUGH THE LEVEL SECTION AND THE
DOWNSTREAM FACE OF THE DAM.
5. EXTEND THE OUTLET APRON BELOW THE TOE OF THE DAM ON LEVEL GRADE UNTIL STABILE CONDITIONS ARE
REACHED.
6. MAKE THE EDGES AND END OF THE STONE APRON SECTION FLUSH WITH THE SURROUNDING GROUND (NO OVERFALL
SHOULD EXIST.)
7. COVER THE INSIDE FACE OF THE STONE OUTLET SECTION WITH A 1 ft. LAYER OF INDOT CA No. 5.
8. STABILIZE THE EMBANKMENT.
9. SET A STAKE AT ONE -HALF THE DESIGN DEPTH TO MARK THE CLEANOUT LEVEL.
SEDIMENT TRAP SPILLWAY MAINTENANCE REQUIREMENTS
1. INSPECT TEMPORARY SEDIMENT TRAPS AFTER EACH STORM EVENT, AND
IMMEDIATELY REPAIR ANY EROSION AND PIPING HOLES.
2. REMOVE SEDIMENT WHEN IT HAS ACCUMULATED TO ONE -HALF THE DESIGN DEPTH.
3. REPLACE SPILLWAY GRAVEL FACING IF CLOGGED.
4. INSPECT VEGETATION, AND RE -SEED IF NECESSARY.
5. CHECK THE SPILLWAY DEPTH PERIODICALLY TO ENSURE A MINIMUM OF 1 FT. DEPTH
FROM THE LOWEST POINT OF THE SETTLED EMBANKMENT TO HIGHEST POINT OF THE
SPILLWAY CREST, AND FILL ANY LOW AREAS TO MAINTAIN DESIGN ELEVATION.
NOTE:
KEY STONE INTO CHANNEL BANKS AND
EXTEND IT BEYOND THE ABUTMENTS A
MINIMUM OF 18" (0.5m) TO PREVENT
FLOW AROUND DAM.
FLOW
NOTE:
CHECK DAMS TO BE INSTALLED
ONLY IF NEEDED TO CONTROL
DITCH EROSION. SEE DITCH
MAINTENANCE NOTE #4.
FILTER
FABRIC
5`
CROSS- SECTION
4' (MIN.)
SEDIMENT TRAP AND SPILLWAY DETAIL
NOT TO SCALE
18" (0.5m)
A
s F 6" (1
w �'f� 2 /.y r i1' i I/
•41 /r l1 at
VIEW LOOKING UPSTREAM
SECT A A
'L' THE DISTANCE SUCH THAT POINTS 'A' AND
`B' ARE OF EQUAL ELEVATION.
FILTER
FABRIC
SPACING BETWEEN CHECK DAMS
ROCK CHECK DAM
NOT TO SCALE
1:1 SIDE
SLOPE (MAX.)
24" (0.6m)
5 APRON
(MIN.)
OVERFILL 6" FOR
SETTLEMENT
-2: SIDE
SLOPE (MAX.)
ROCK CHECK DAM INSTALLATION REQUIREMENTS
1. EXCAVATE A CUTOFF TRENCH INTO THE DITCH BANKS, AND EXTEND IT A MINIMUM OF 18 in. BEYOND THE ABUTMEN TS.
2. PLACE THE ROCK IN THE CUTOFF TRENCH AND CHANNEL TO THE LINES AND DIMENSIONS SHOWN IN DETAIL, CENTER
MAXIMUM OF 2 ft. HIGH YET 9 in. BELOW WHERE THE DAM ABUTS THE CHANNEL BANKS.
3. EXTEND THE ROCK AT LEAST 18 in. BEYOND THE CHANNEL BANKS TO KEEP OVERFLOW WATER FROM UNDERCUTTING
THE DAM AS IT RE- ENTERS THE CHANNEL.
4. INSTALL AS MANY DAMS AS NECESSARY TO SATISFY THE SPACING REQUIREMENT SHOWN IN DETAIL.
5. STABILIZE THE CHANNEL ABOVE THE UPPERMOST DAM.
6. RECOGNIZING THAT WATER WILL FLOW OVER AND AROUND THE LOWERMOST DAM, PROTECT THE CHANNEL DOWNSTREAM
FROM IT WITH AN EROSION RESISTANT LINING FOR A DISTANCE OF 6 ft. UNLESS THE CHANNEL IS PROTECTED
THROUGH OTHER MEANS.
ROCK CHECK DAM MAINTENANCE REQUIREMENTS
1. INSPECT CHECK DAMS AND THE CHANNEL AFTER EACH STORM EVENT, AND REPAIR ANY DAMAGE IMMEDIATELY.
2. IF SIGNIFICANT EROSION OCCURS BETWEEN DAMS, INSTALL A RIPRAP LINER IN THAT PORTION OF THE CHANNEL.
3. REMOVE SEDIMENT ACCUMULATED BEHIND EACH DAM AS NEEDED TO MAINTAIN CHANNEL CAPACITY, TO ALLOW
DRAINAGE THROUGH THE DAM, AND TO PREVENT LARGE FLOWS FROM DISPLACING SEDIMENT.
4. ADD ROCK TO THE DAMS AS NEEDED TO MAINTAIN DESIGN HEIGHT AND CROSS SECTION.
5. WHEN THE DAMS ARE NO LONGER NEEDED, REMOVE THE ROCK AND STABILIZE CHANNEL, USING AN EROSION- RESISTANT
LINING IF NECESSARY.
Z t
p g.1;63
Z r:14 e“'
nve
r *p
Z
Z~
E
Z 04 a� L
w
~A
d
a g
l
Z N
4 e t'- 0
a'
r et
0
c�
0
Cl)
O Z 70
vs
0
65
ZQ
0 ic
a
cc
(1.1
W
d
z
a
DATE:
DRAWN BY:
CHK'D BY:
JOB NO.
12/05/03
WJT
KMB
1N2003.0744
REVISIONS
/3\ GENERAL
03/2
SHEET NO.
C5.2
OF
I N 2003.0744.073.C52 •C53