SW5210201_Essex Townes - Revised Pond Detail Sheet_20210623

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100-YEAR FLOODPLAIN
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L LITTORAL SHELF FOR PLANTINGS
MIN. 6' WIDE
'L 6H:1V MAX SLOPE
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POND GRADING
SCALE: 1"=50'
CONSTRUCTION DESIGN DATA
DESIGN PARAMETER
DESIGN VALUE
AS -BUILT VALUE
TOP OF DAM ELEVATION
326.0
XXX
SEDIMENT CLEANOUT ELEV.
314.0
XXX
BOTTOM OF POND ELEVATION
313.0
XXX
RISER CREST ELEV.
323.0
XXX
RISER SIZE
48"x48" LD SQUARE
XXX
NORMAL POOL ELEVATION
318.0
XXX
ORIFICE ELEVATION
318.0
XXX
ORIFICE DIAMETER
2.5 INCHES
XXX
BARREL DIAMETER
18 IN
XXX
BARREL UPSTREAM INV.
315.0
XXX
BARREL DOWNSTREAM INV.
314.0
XXX
BARREL LENGTH
70FT
XXX
ANTI -FLOTATION BLOCK SIZE
8'X8'X1.5'
XXX
ANTI -SEEPAGE COLLAR SIZE 6'x6' XXX
CALCULATED POND DATA
SURFACE AREA REQUIRED
13,735 SF
XXX
SURFACE AREA PROVIDED
16,196 SF
XXX
WQ RAINFALL VOLUME
32,142 CF
XXX
ELEV. AT WQ VOLUME
319.8
XXX
Q(1) DISCHARGE
0.4 CFS
XXX
Q(1) ELEV.
320.8
XXX
Q(2) DISCHARGE
0.5 CFS
XXX
Q(2) ELEV.
321.9
XXX
Q(10) DISCHARGE
3.6 CFS
XXX
Q(10)ELEV.
323.1
XXX
Q(25) DISCHARGE
13.8 CFS
XXX
Q(25) ELEV.
323.4
XXX
Q(100) DISCHARGE
23.5 CFS
XXX
Q(100) ELEV.
324.6
XXX
CONTOUR
DATA
CONTOUR ELEV
DESIGN AREA
AS -BUILT AREA
318
16,196 SF
XXX
320
20,226 SF
XXX
322
24,483 SF
XXX
324
53,468 SF
XXX
326162,659 SFIXXXSFIXXX
AQUATIC SHELF PLANTINGS
SYMBOL
TOTAL
BOTANICAL NAME
COMMON NAME
°
229
PONTEDERIA CORDATA
PICKERELWEED
} {
229
IRIS VIRGINICA
BLUE FLAG IRIS
267
JUNCUS EFFUSUS var
SOFT RUSH
SOLUTUS
229
HIBISCUS COCCINEUS
SCARLET ROSE MALLOW
NOTES
1. BLUE FLAG IRIS AND SOFT RUSH PERFORM BEST
WHEN PLANTED IN 0" TO 2" OF WATER. THEREFORE
THESE TWO VARIETIES SHOULD BE PLANTED CLOSE
TO THE NORMAL POOL ELEVATION BUT STILL BELOW
THE NORMAL POOL ELEVATION.
3X PIPE O.D.
3X PIPE O.D. � � � 6"
ANTI -SEEPAGE COLLAR
NOT TO SCALE
NOTES
1. THE CONCRETE COLLAR SHALL HAVE A MINIMUM 28-DAY STRENGTH OF
3000 PSI.
2. ANTI -SEEPAGE COLLARS SHALL BE CONNECTED TO THE BARREL PIPE
WITH A WATERTIGHT JOINT.
3. INSTALL ANTI -SEEPAGE COLLAR AT THE CENTER OF THE EMBANKMENT.
4. ANTI -SEEPAGE COLLARS SHALL BE INSTALLED AT LEAST 2 FEET FROM ANY
PIPE JOINT.
AREA OF SHELF
3,804 SF
REQUIRED PLANTING RATE
50 PER 200 SF OF SHELF AREA
PLANTINGS REQUIRED
951
PLANTINGS PROVIDED
954
TYPICAL 200 SQUARE FOOT AQUATIC SHELF PLANTINGS
NOT TO SCALE
HANDWHEELTO^BE EXTENDED
CLCVHI IVIVJ, 3ILC3 HIVU VIIVICIVJIVIVJ ur I
ELEMENTS SHOWN ON THIS SECTION TYPICAL DAM CROSS SECTION
NOT TO SCALE
TOP OF AQUATIC
SHELF (AT NORMAL
POOL ELEVATION)
MIDDLE OF AQUATIC
SHELF (6" BELOW
NORMAL POOL)
BOTTOM OF AQUATIC
SHELF (12" BELOW
NORMAL POOL)
COMPLETE GRADING BEFORE PREPARING SEEDBEDS, AND INSTALL ALL
NECESSARY EROSION CONTROL PRACTICES SUCH AS, DIKES, WATERWAYS,
AND BASINS. MINIMIZE STEEP SLOPES BECAUSE THEY MAKE SEEDBED
PREPARATION DIFFICULT AND INCREASE THE EROSION HAZARD. IF SOILS
BECOME COMPACTED DURING GRADING, LOOSEN THEM TO A DEPTH OF
6-8 INCHES USING A RIPPER, HARROW, OR CHISEL PLOW.
SEEDBED PREPARATION
GOOD SEEDBED PREPARATION IS ESSENTIAL TO SUCCESSFUL PLANT
ESTABLISHMENT. A GOOD SEEDBED IS WELL -PULVERIZED, LOOSE, AND
UNIFORM. WHERE HYDROSEEDING METHODS ARE USED, THE SURFACE
MAY BE LEFT WITH A MORE IRREGULAR SURFACE OF LARGE CLODS AND
STONES.
LIMING -APPLY LIME ACCORDING TO SOIL TEST RECOMMENDATIONS.
IF THE PH (ACIDITY) OF THE SOIL IS NOT KNOWN, AN APPLICATION OF
GROUND AGRICULTURAL LIMESTONE AT THE RATE OF 1 TO 1 1/2
TONS/ACRE ON COARSE -TEXTURED SOILS AND 2-3 TONS/ACRE ON
FINETEXTURED SOILS IS USUALLY SUFFICIENT. APPLY LIMESTONE
UNIFORMLY AND INCORPORATE INTO THE TOP 4-6 INCHES OF SOIL.
SOILS WITH A PH OF 6 OR HIGHER NEED NOT BE LIMED.
FERTILIZER -BASE APPLICATION RATES ON SOILTESTS. WHEN THESE
ARE NOT POSSIBLE, APPLY A 10-10-10 GRADE FERTILIZER AT 700-1,000
LB/ACRE. BOTH FERTILIZER AND LIME SHOULD BE INCORPORATED INTO
THE TOP 4-6 INCHES OF SOIL. IF A HYDRAULIC SEEDER IS USED, DO NOT
MIX SEED AND FERTILIZER MORE THAN 30 MINUTES BEFORE
APPLICATION.
SURFACE ROUGHENING -IF RECENT TILLAGE OPERATIONS HAVE
RESULTED IN A LOOSE SURFACE, ADDITIONAL ROUGHENING MAY NOT
BE REQUIRED, EXCEPT TO BREAK UP LARGE CLODS. IF RAINFALL
CAUSES THE SURFACE TO BECOME SEALED OR CRUSTED, LOOSEN IT
JUST PRIOR TO SEEDING BY DISKING RAKING HARROWING OR OTHER
SUITABLE METHODS. GROOVE OR FURROW SLOPES STEEPER THAN 3:1
ON THE CONTOUR BEFORE SEEDING (PRACTICE 6.03, SURFACE
ROUGHENING).
PLANT SELECTION
SELECT AN APPROPRIATE SPECIES OR SPECIES MIXTURE FROM TABLE 6.10A
FOR SEEDING IN LATE WINTER AND EARLY SPRING, TABLE 6.1013 FOR
SUMMER, AND TABLE 6.10C FOR FALL. IN THE MOUNTAINS, DECEMBER
AND JANUARY SEEDINGS HAVE POOR CHANCES OF SUCCESS. WHEN IT IS
NECESSARY TO PLANT AT THESE TIMES, USE RECOMMENDATIONS FOR FALL
AND A SECURELY TACKED MULCH.
SEEDING
EVENLY APPLY SEED USING A CYCLONE SEEDER (BROADCAST), DRILL,
CULTIPACKER SEEDER, OR HYDROSEEDER. USE SEEDING RATES GIVEN IN
TABLES 6.10A-6.10C. BROADCAST SEEDING AND HYDROSEEDING ARE
APPROPRIATE FOR STEEP SLOPES WHERE EQUIPMENT CANNOT BE DRIVEN.
HAND BROADCASTING IS NOT RECOMMENDED BECAUSE OF THE
DIFFICULTY IN ACHIEVING A UNIFORM DISTRIBUTION. SMALL GRAINS
SHOULD BE PLANTED NO MORE THAN 1 INCH DEEP, AND GRASSES AND
LEGUMES NO MORE THAN 1/2 INCH. BROADCAST SEED MUST BE COVERED
BY RAKING OR CHAIN DRAGGING, AND THEN LIGHTLY FIRMED WITH A
ROLLER OR CULTIPACKER. HYDROSEEDED MIXTURES SHOULD INCLUDE A
WOOD FIBER (CELLULOSE) MULCH.
MULCHING
THE USE OF AN APPROPRIATE MULCH WILL HELP ENSURE ESTABLISHMENT
UNDER NORMAL CONDITIONS, AND IS ESSENTIAL TO SEEDING SUCCESS
UNDER HARSH SITE CONDITIONS (PRACTICE 6.14, MULCHING). HARSH SITE
CONDITIONS INCLUDE:
SEEDING IN FALL FOR WINTER COVER ( WOOD FIBER MULCHES ARE
NOT CONSIDERED ADEQUATE FOR THIS USE),
),
SLOPES STEEPER THAN 3:1,
EXCESSIVELY HOT OR DRY WEATHER
ADVERSE SOILS (SHALLOW ROCKY OR HIGH IN CLAY OR SAND AND
)�
AREAS RECEIVING CONCENTRATED FLOW.
IF THE AREA TO BE MULCHED IS SUBJECT TO CONCENTRATED WATERFLOW,
AS IN CHANNELS, ANCHOR MULCH WITH NETTING (PRACTICE 6.14,
MULCHING).
FROM: DEMLR EC MANUAL SECTION 6.10 REVISED 5113
- 1' (TYP)
TRASH RACK DETAIL
NOT TO SCALE
NOTES
1. THE TRASH RACK SHALL BE CONSTRUCTED OF #4 REBAR
2. THE TRASH RACK SHALL BE ATTACHED TO THE RISER WITH FOUR
EQUALLY SPACED HOT -DIPPED GALVANIZED STEEL CLAMPS.
3. THE TRASH RACK WILL BE PROVIDED WITH A HINGED ACCESS HATCH
PROVIDED BY THE FABRICATOR.
POND CERTIFICATION REQUIREMENTS
THE CONTRACTOR SHALL NOTE THAT THE FOLLOWING DOCUMENTATION IS
REQUIRED FOR CERTIFICATION OF THIS POND. ADDITIONAL ITEMS MAY BE
REQUIRED DEPENDING ON THE REVIEWING AUTHORITY.
1. AN AS -BUILT SURVEY WITH BARREL PIPE INVERTS AND DIAMETER, RISER
DIMENSIONS AND CREST ELEVATION, ORIFICE ELEVATION(S) AND
DIAMETER(S)
2. AN AS -BUILT TOPOGRAPHIC SURVEY OF THE POND AT ONE FOOT
CONTOUR INTERVALS, INCLUDING THE TOP OF EMBANKMENT AND
DOWNSTREAM SLOPE(S) OF THE EMBANKMENT
3. COMPACTION TESTS PERFORMED PER THE GEOTECHNICAL ENGINEER'S
RECOMMENDATIONS. THIS SHOULD INCLUDE COMPACTION TESTS OF
SOIL UNDER THE BARREL PIPE IF THE CONCRETE CRADLE WAS NOT USED.
4. VERIFICATION OF ANTI -SEEPAGE COLLAR SIZE AND INSTALLATION
5. VERIFICATION OF ANTI -FLOTATION BLOCK DIMENSIONS AND
INSTALLATION
PERMANENT SODDING
ALL SOD SHOULD BE PLACED IN ACCORDANCE WITH SECTION 6.12 OF THE NC
DENR EROSION CONTROL MANUAL.
SPECIES:
HYBRID BERMUDAGRASS
SOIL PREPARATION:
APPLY LIME AT A RATE OF 100 LB PER 1,000 SF. APPLY FERTILIZER AT A RATE
OF 25 LB PER 1,000 SF OF 10-10-10 IN FALL OR 5-10-10 IN SPRING.
SOD INSTALLATION:
1. PRIOR TO LAYING SOD, CLEAR SURFACE OF SOIL OF ALL TRASH AND
DEBRIS. FILL ALL LOW SPOTS TO AVOID STANDING WATER.
2. PRIOR TO INSTALLATION, STORE ALL SOD IN SHADE AND MOISTEN TO
MAINTAIN VIABILITY. DELIVERY AND INSTALLATION OF SOD SHOULD
TAKE PLACE WITHIN A PERIOD OF 36 HOURS.
3. DURING SUMMER, LIGHTLY IRRIGATE SOIL IMMEDIATELY BEFORE LAYING
SOD.
4. LAY FIRST ROW OF SOD IN A STRAIGHT LINE WITH SUBSEQUENT ROWS
PLACED PARALLEL TO AND BUTTING TIGHTLY AGAINST EACH OTHER.
STAGGER STRIPS IN A BRICK -LIKE PATTERN. ENSURE THAT THE SOD IS
NOT STRETCHED OR OVERLAPPED. TRIM AND FIT IRREGULARY AREAS
WITH A KNIFE OR SHARP SPADE.
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. AFTER SODDING OF AREAS IS COMPLETE, ROLL SOD TO PROVIDE FIRM
CONTACT BETWEEN ROOTS AND SOIL.
7. IRRIGATE UNTIL THE SOIL IS WET 4 INCHES BELOW THE SOD. KEEP
SODDED AREAS MOIST TO A DEPTH OF 4 INCHES UNTIL GRASS TAKES
ROOT.
8. NO MOWING SHOULD OCCUR UNTIL THE SOD IS FIRMLY ROOTED,
USUALLY 2-3 WEEKS.
MAINTENANCE:
WATER AS NECESSARY TO MAINTAIN ADEQUATE MOISTURE. GRASS HEIGHT
SHOULD BE MAINTAINED BETWEEN 1 AND 2 INCHES. APPLY FERTILIZER
ANNUALY AT A RATE OF 5-6 LB
NITROGEN PER 1,000 SF.
PERMANENT SEEDING
FOR GENTLE SLOPES, SUN OR SEMI -SHADE, HIGH -MAINTENANCE, MINIMUM
CARE LAWNS
SEEDING MIXTURE
SPECIES RATE (LB/ACRE)
TALL FESCUE BLEND (EQUAL PARTS
OF TWO OR PREFERABLY THREE
TURF -TYPE TALL FESCUES) 200-500
BEST
POSSIBLE
BELOW 2,500 FT AUG 15 - SEPT 1
JULY 25 - SEPT 15
MAR 1 - APR 1
MAR 1 - MAY10
ABOVE 2,500 FT JULY 25 - AUG 15
JULY 15 - AUG 30
MAR 20 - APR 20
MAR 5 - MAY 15
SOIL AMMENDMENTS
APPLY LIME AND FERTILIZER ACCORDING TO SOIL TESTS OR APPLY 4,000
LB ACRE GROUND AGRICULTURAL LIMESTONE AND 4,000 LB ACRE 10-10-10
FERTILIZER.
MULCH
APPLY 4,000 LB/ACRE GRAIN STRAW OR EQUIVALENT COVER OF ANOTHER
SUITABLE MULCH. ANCHOR STRAW BY TACKING WITH ASPHALT AT400
GAL/ACRE, NETTING, OR ROVING OR BY ROLLING AND WATERING
MAINTENANCE
THE BUNCH -TYPE HABIT OF TALL FESCUE RESTRICTS ITS SPREAD INTO
DAMAGED AREAS. RESEED BARE SPOTS IN THE FALL. REFERTILIZE ANNUALLY
IN LATE WINTER AND AGAIN IN FALL. RESEED, FERTILIZE, AND MULCH
DAMAGED AREAS IMMEDIATELY.
NOTE: PERMANENT SEEDING NOTED ABOVE IS ONLY FOR AREAS NOT
COVERED WITH SOD
750 PSI
CONCRETE CRADLE DETAIL
NOT TO SCALE
CONCRETE CRADLE NOTES
1. EXCAVATE TRENCH FOR THE CONCRETE CRADLE AND BARREL PER THE
DIMENSIONS ON THE CONCRETE CRADLE DETAIL.
2. PLACE BARREL PIPE ON CONCRETE BLOCKS TO ACHIEVE SLOPE AND
INVERTS NOTED ON THE POND DETAIL SHEET.
3. PLACE 2 FOOT WIDE STRIPS OF FILTER FABRIC OVER PIPE JOINTS BEFORE
PLACING FLOWABLE FILL
4. PLACE FLOWABLE FILL AS ONE LIFT UP TO THE SPRINGLINE OF THE PIPE.
5. ALLOW CRADLE TO CURE FOR AT LEAST 7 DAY SBEFORE USING ANY
VIBRATING EQUIPMENT IN THE VECINITY OF THE PIPE.
CONCRETE CRADLE ALTERNATE
THE CONTRACTOR MAY CHOOSE TO ELIMINATE THE CONCRETE CRADLE AND
USE COMPACTED BACKFILL. IF THE CONCRETE CRADLE IS NOT USED THE
COMPACTED BACKFILL MUST BE PLACED PER THE GEOTECHNICAL ENGINER'S
RECOMMENDATIONS.
50 0 25 50 100
SCALE: 1"=50'
PRELIMINARY DRAWING - NOT RELEASED FOR CONSTRUCTION
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PROJECT NO:
DESIGN BY:
JPE
DRAWN BY:
JPE
SCALE:
1"=50'
DATE:
01/26/2021
SHEET NO:
PD1.1