SW6191002_CG512_12/17/2019

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Correct Butting —angled ends caused by the automatic
ML Incorrect
sod cutting must be matched correctly.
Old
Lay sod in a staggered
pattern with strips butted
tightly against each other. A
sharpened mason's trowel can
be used to tuck down the ends
and trim pieces.
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Roll sod immediately to Water to a depth of 4 " Mow when the sod is es -
achieve firm contact as soon as the sod is tablished (2-3 wks). Set
with the soil. laid, and continue the mower high (2-3").
watering as needed.
Figure 6.12a Proper installation of grass sod (modified from Va SWCC).
EL. 220.00'
3. Do not sod on gravel, frozen soils, or soils that have been treated recently
with sterilants or herbicides.
4. Lay the first row of sod in a straight line with subsequent rows placed
paralled to and butting tightly against each other. Stagger strips in a brick -like
pattern. Be sure that the sod is not streached or overlapped and that all joints
are butted tightly to prevent voids. Use a knife or sharp spade to trim and fit
irregularly shaped areas.
5. Install strips of sod with their longest dimension perpendicular to the
slope. On slopes 3:1 or greater, or wherever erosion may be a problem, secure
sod with pegs or staples.
6. As sodding of clearly defined areas is completed, roll sod to provide firm
contact between roots and soil.
7. After rolling, irrigate until the soil is wet 4 inches below the sod.
STORMWATER MANAGEMENT POND
SCALE: NTS
VEGETATED SIDE SLOPES
PLANT WITH NON -CLUMPING
TURF GRASS: TREES AND WOODY
SHELVES NOT ALLOWED- FRONT AND SACK
EMBANKMENT SLOPES REQUIRED TO BE
VEGETATED.
PRE.TREATMENT
GRAVEL VERGES, FILTER STRIPS,
GRASSED SWALES OR FOREBAYS
REQUIRED TO SETTLE SEDIMENT AND
PREVENT EROSION.
RISER PROTECTION
TRASH RACKISCREEN OR
OTHER DEVICE REQUIRED
TEMPORARY POOL- -
EMBANKMENT
MINIMUM WIDTH:10 FT FOR
MAINTENANCE ACCESS
r EMERGENCY SPILLWAY
STROMWATER MANAGEMENT POND RISER
SCALE: NTS
3.0'
SQUARE
TRASH RACK (REQUIRED)
2.0' i
3" X 1" ORIFICE
EL.220.00' ;
OUTLET PIPE
EL.219.50' _
SMALL PERMANENT POOL -
TO REDUCE CLOGGING OF �.+ ~ _: • '{ ° „C i- _;`
THE ORIFICE
ANTI -SEEP MEASURES ARE
ANTI -FLOTATION SLAB .' s ~ . " r ' ' - Y '•''
: RECOMMENDED
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UNCLASSIFIEDHFOR OFFICIAL USE ONLY
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Practice Standards and Specifications
8. Keep sodded areas moist to a depth of 4 inches until the grass takes root.
This can be determined by gently tugging on the sod —resistance indicates
that rooting has occurred.
9. Mowing should not be attempted until the sod is firmly rooted, usually 2-3
weeks.
Sodded waterways —Sod provides a resilient channel lining, providing
immediate protection from concentrated runoff and eliminating the need for
installing mats or mulch. The following points apply to the use of sod in
waterways:
1. Prepare the soil as described in Practice 6.30, Grass -lined Channels. The
sod type must be able to withstand the velocity of flow specified in the channel
design (Appendix 8.05).
2. Lay sod strips perpendicular to the direction of flow, with the lateral joints
staggered in a brick -like pattern. Edges should butt tightly together (Figure
6.12b).
Flow
Use pegs or stables to fasten sod firmly at the
ends of strips and in the center, or every 3-4'
if the strips are long. When ready to mow,
drive pegs or staples flush with the ground.
Lay sod across the
direction of flow.
T
6-10"
2 �.... .Peg or .0I f
i staple
n�ssaa��aaes�__..,.
a RSoaF'
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Figure 6.12b Installation of sod in waterways (modified from Va SWCC).
EL. 224.00'
EL. 223.00'
EL. 222.92'
EL. 222.92'
MANHOLE
53 LF 18" PIPE
STORM 'B' 226.50
7
Table 6.12b
Characteristics of the Principal Lawn Grasses Grown as Sod in North Carolina
Species or Mixture
Adaptation
Maintenance
Annual
Mowing
Mowing
Shade
Heat
Cold
Drought
Wear
Fertilizer
Height
Frequency
z
(lb N/1000 ft)
(in.)
Kentucky bluegrass
good
fair
good
good
good
2.5-4
2
med.
Kentucky bluegrass/
good
good
good
good
good
2.5-3
3
high
Tall fescue
Tall fescue
good
good
good
good
good
2.5-3.5
3
high
Hybrid Bermudagrass
poor
good
poor
excel.
excel.
5-6
1
high
Centipedegrass
fair
good
poor
good
poor
0.5
1
low
St. Augustinegrass
good
good
poor
good
poor
2.5
2-3
med.
Zoysiagrass
fair
good
fair
excel.
good
1.5
1
high
Adapted from Carolina
Lawns, NCAES
Bulletin no.
AG-69.
3. After rolling or tamping to create a firm contact, peg or staple individual sod
strips to resist washout during establishment. Jute or other netting material may
be pegged over the sod for extra protection on critical areas.
Maintenance After the first week, water as necessary to maintain adequate moisture in the
root zone and prevent dormancy of the sod.
Do not remove more than one-third of the shoot in any mowing. Grass height
should be maintained between 2 and 3 inches unless otherwise specified.
After the first growing season, established sod requires fertilization, and may
also require lime. Follow soil test recommendations when possible, or use the
rates in Table 6.12b.
References Site Preparation
6.04, Topsoiling
Surface Stabilization
6.11, Permanent Seeding
Runoff Conveyance Measures
6.30, Grass -lined Channels
Inlet Protection
6.53, Sod Drop Inlet Protection
Appendices
8.02, Vegetation Tables
8.05, Design of Stable Channels and Diversions
Practice Standards and Specifications
6.65
Definition
Porous barriers installed inside a temporary sediment trap, skimmer basin, or
sediment basin to reduce the velocity and turbulence of the water flowing
through the measure, and to facilitate the settling of sediment from the water
_10 YR.: 230.50
before discharge.
Purpose
Sediment traps and basins are designed to temporarily pool runoff water to
allow sediment to settle before the water is discharged. Unfortunately, they
are usually not very efficient due to high turbulence and "short-circuiting"
flows which take runoff quickly to the outlet with little interaction with most
of the basin. Porous baffles improve the rate of sediment retention by distributing
the flow and reducing turbulence. This process can improve sediment retention.
Conditions Where
This practice should be used in any temporary sediment trap, skimmer basin,
Practice Applies
or temporary sediment basin.
BIORETENTION CELL OUTLET
CONTROL STRUCTURE (OCS) DETAIL
N.T.S.
18" RCP
Planning Porous baffles effectively spread the flow across the entire width of a sediment
Considerations basin or trap. Water flows through the baffle material, but is slowed sufficiently
to back up the flow, causing it to spread across the entire width of the baffle
(Figure 6.65a).
Spreading the flow in this manner utilizes the full cross section of the basin,
which in turn reduces flow rates or velocity as much as possible. In addition,
the turbulence is also greatly reduced. This combination increases sediment
deposition and retention and also decreases the particle size of sediment captured.
The installation should be similar to a sediment fence (Figure 6.65b). The fabric
should be 700 g/m2 coir erosion blanket (Figure 6.65c) or equal. A support wire
across the top will help prevent excessive sagging if the material is attached to it
with appropriate ties.
18" RCP
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S1lR�AGE
Practice Standards and Specifications
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BIORETENTION CELL
SCALE: NTS
,C.O TOPIEMBANKMENT
`1?i3ftbt-ATl i 7 EL. 231.0'
i 3.0'
10-YR VOLUME: -p
7,034 FT-- SQUARE
I' 1~1f�k'�I �L�Yti��l
10-YR WSEL. 230.50'
-
-_ WEIR EL. 230.33'
TOP/MEDIA
-
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EL 229.5 -
SURFACE AREA = 6,435 FT
TWO "OPEN" SIDES FOR
TOTAL WEIR LENGTH OF 4'
2.5' a
(SEE BIORETENTION CELL
44
OCS DETAIL)
0.5'
-.-.
-- INV. EL 226.50'
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1=f)IA NdTES;.
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MEDIA DEPTH 1
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- SAND MEDIA SHOULD BE ASTM C33, AASHTO M 6/M
80, ASTM C330, AASHTO M195, OR EQUIVALENT
- SOIL MEDIA SHOULD BE SENT TO AN NC DEPT. OF
AGRICULTURE LAB (OR ANOTHER REPUTABLE LAB)
FOR ANALYSIS OF THE PHOSPHORUS INDEX
(P-INDEX). SOIL MEDIA WITH P-INDICES EXCEEDING
50 ARE NOT TO BE USED.
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CG512
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