SW1231201_Plansheet - SCM Detail_20231212

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4' X 6' PRECAST CONCRETE STRUCTURE
TOP ELEV = 2335.0 GALVANIZED TRASH RACK =
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3" X 36" WEIR FACING THE WETLAND TOP OF COMPACTED EARTHEN =
WEIR ELEV = 2334.25 EMBANKMENT
BERM 3" ABOVE FELEV = 2337.0 U_
PERMANENT POOL 10' WIDE WEIR OPENING w
ELEVATION 4" PVC TEE INVERT INTO IN EARTHEN EMBANKMENT ~
RISER AT ELEV. = 2333.0 P TOP OF TEE D C ELEV = 2336.0 Q
SOLID INFLOW SO It
TEMPORARY POOL = 2334.25 SIGN N N
3:1 MAX. j
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RIPRAP BACKED WITH TEMPORARY 15" MAX 1' \ / z
FILTER CLOTH PERMANENT POOL = 2333.0 i \ 1 r }
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FOREBAY EXIT POOL STABLE OUTFACE CLASS B /
3' DEEP 3' DEEP RIP-RAP AND FILTER
AT OUTLET CLOTH
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o.s' o.s' y c �\ ��� 23.88 LF 24" HDPE �
0"-9" BELOW PERMANENT 12" SOIL AMENDMENT OF \ \ \ U)
POOL ELEVATION SHALLOW ORGANIC MATERIAL FOR f /1 \ -\ \ o
WATER ZONE ENHANCED PLANTING MEDIA ( x\` - \ `\ / U)
1.5" ORIFICE _> I _ w
IN BOTTOM KEYWAY
SHALLOW WATER ZONE CAP OF TEE 1 I /' \ PROPOSED WP INLET \
ANTI-SEEP COLLAR * I I / -_ STA 23+73.31 / LU
SEDIMENT STORAGE AT Alignment - (Storm D) \ LL
RIM: 2331.83/ / /
BOTTOM OF OUTLET INVERT ELEV. = 2330.0 I I I \ INV IN: 2329.65 � \\ 0
DEEP POOL 2 X 24" RCP OUTLET I I / �. \� \ f I \
PIPES / I MAli �NI v I z
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TYPICAL CROSS-SECTION !� I I FOREBAY o
SURFACE AREA = 1182.86SF \
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4' X 6' PRECAST CONCRETE GALVANIZED TRASH RACK PROPOSED CI-D13
RISER TOP ELEV. = 2335.0 PER MANUFACTURER / STA 23+49.43 \
/ //�• CONSTRUCTION NOTES Alignment - (Storm D) / \
� \ \ TEMPORARY INUNDATION ZONE \
RIM: 2335.61
4S1 `/\\//\\//\\//\\//\\//\\//\\//\\ 1. ALL PRE CAST STRUCTURES SHALL BE 4000 PSI CONCRETE INV IN: 2330.35 `\ - \� \ --- SURFACE AREA = 3822.86SF
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\\\\\\\\\\\\\\\\\\\\\' 2. ENGINEER MUST APPROVE ALL PRE CAST STRUCTURES -- INV OUT: 2330.25
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/ \ 3. ALL PIPE IN STORM DRAINAGE STRUCTURE SHALL BE STRUCK �,
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D /\/ EVEN WITH THE INSIDE WALL AND GROUTED AND BRUSHED SMOOTH
36 X 3"HIGH OPENING ELEV. = 2334.25 __ ./\/\/\/\/\/\/\/\/\/\ \\\/\\/\\/\\/\\/\\/\\/\\/\\/\\/\\/\
TOP OF TEMPORARY POOL `_, 1 L �\ �� \\ / NON-FOREBAY DEEP POOL
(OPEN ONE SIDE FACING WETLAND) I- /X /////j//j//j//j//j//j//j//j//j//j//j//j//j \� \ \ - \ \ /
PERMANENT POOL ELEV. = w
2333.0 SURFACE AREA = 829 70SF
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BOTTOM OF TEE = 2332.0 _ _ / //// / //// //// //// / //// //// /\ 36"06" CORRUGATED TEMPORARY INUNDATION ZONE
ALUMINUM SURFACE AREA = 3822.86SF
ANTI-SEEP COLLAR \ \ S
2 X 24 RCP OUTLET PIPES EMERGENCY SPILLWAY
PROTECTED WITH
CLASS B RIP-RAP
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///\\j ° INLET OUTLET
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w \,�\//\//\// D ° ° . D °D. °. \\//\//\//\//\//\// 1 i SHALLOW WATER ZONE
SURFACE AREA = 4367.93SF
(n /\\ \\ \ > D. D. . .D..D ° ; D .D \ KEYWAY
CATCH BASIN AND CONCRETE ANTI-FLOTATION BLOCK
CAST TOGETHER FOR PRE-CAST MONOLITHIC BASE
Q SECTION B ANTI-FLOTATION BLOCK DIMENSIONS 8 x8 x2 x _ /
PROPOSED WP Outlet Box
OUTLET CONTROL STRUCTURE STA 10+00.00
/ Alignment - (Wet Pond Outlet) /
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RIM: 2335.08
I / INV OUT. 2330.00 0
o NOTES: - -`
1. VOLUME REQUIRED IS THE TREATMENT VOLUME OF THE TEMPORARY POOL. TEMPORARY POOL SHALL I / N /
0 NOT EXCEED 15" IN DEPTH. DRAWDOWN TIME FOR THE TEMPORARY POOL SHALL BE 2 TO 5 DAYS. I / OUTLET CONTROL STRUCTURE I-% ,-----__
2. SURFACE AREA REQUIRED IS BASED ON 15" DEPTH. FLOW PATH FROM INLET TO OUTLET SHALL BE I / ! cV ----
o MAXIMIZED IN LENGTH. I / /ICd
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3. FOREBAY (DEEP POOL) SHALL BE CONSTRUCTED AT THE INLET.Uj
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Uj 4. LOCATE A DEEP POOL AT THE OUTLET CONTROL STRUCTURE.
U) 5. PLANTINGS SHALL BE CHOSEN FROM APPROVED NCDEQ PLANTING LISTS FOR STORMWATER WETLANDS,
SHALLOW WATER PLANTINGS AND TEMPORARY INUNDATION ZONE PLANTINGS.
0 6. A SOIL ANALYSIS SHALL BE CONDUCTED TO DETERMINE PROPER SOIL AMENDMENTS TO BE ADDED TO
THE FIRST 12" OF SOIL DEPTH FOR HEALTHY PLANT GROWTH. / PROPOSED WP Outlet HW
N 7. SEE INSPECTION AND MAINTENANCE AGREEMENT FOR WETLAND MAINTENANCE PROCEDURES. -------- / i STA 10+86.27
8. THE WETLAND SHALL BE STABILIZED WITHIN 14 DAYS OF CONSTRUCTION. /
0 9. CATTAILS ARE NOT PERMITTED TO BE PLANTED IN OR NEAR THE WETLAND. Alignment - (Wet Pond Outlet) PROPOSED HEADWALL OUTLET ,'
10. THE WETLAND AREA SHALL BE FULLY CLEANED OUT OF ANY SEDIMENT PRIOR TO FINAL CONSTRUCTION
AND PLANTING OF THE WETLAND. NIV.IN: 02330.00 _ ^ j /� �> 1
w 11. THE DEVELOPER SHALL BE RESPONSIBLE FOR ALL OPERATION AND MAINTENANCE OF THE WETLAND --- /- \ /
= STORMWATER CONTROL MEASURE (SCM).
z 12. DURING MAINTENANCE OPERATIONS, THE WETLAND SHALL BE PUMPED AS NECESSARY FOR SEDIMENT
REMOVAL. - --_ _----- _ _ - - I ( �- �� \ - �� 1 +
z CONSTRUCTED WETLAND (SCM) SCHEDULE
SURFACE SURFACE SURFACE SURFACE SURFACE WETLAND SURFACE
DRAINAGE VOLUME AREA AREA AREA AREA AREA AREA DRAWDOWN -
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SCM AREA PROVIDED PROVIDED FOREBAY DEEP POOLS SHALLOW WATER PERMANENT POOL TEMPORARY POOL PIPE DIA. 20 0 10 20 40 PLAN
0 (ACRE) (CU.FT.) (SQ.FT.) (SQ.FT.) (SQ.FT.) (SQ.FT.) (SQ.FT.) (SQ.FT.) (INCH)
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= 1 4.77 10365 10203 1183 830 4368 6381 10203 1.5
U) GRAPHIC SCALE DIVISION VALUE = 20 FEET
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STATE FISH HATCHERY RENOVATION AS NOTED
3 R 55 Broad Street _��� 9�a� O� SCO PROJECT # 19-20324-02A WETLAND PLAN AND DETAILS
z Asheville, NC 28801 _ 344SEAE '11 J��y OFFICE MANAGER DESIGNER
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°�,NGINEE�° NC WILDLIFE RESOURCES COIIIIMISSION M. CATHEY N. CROOM
NC Firm License # C-0459 -,,F,y °°°°°°°°�F, .` 0
T. CAS 23 1 12/5/23 NS STORMWATER REVISIONS PROJECT MANAGER REVIEWER DATE PROJECT# FUNDING#
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12I NO. DATE BY DESCRIPTION TRANSYLVANIA COUNTY, NORTH CAROLINA K. SEAMAN B. CATHEY OCTOBER 2023 19.00124 SCO #19-20324-02A