SW5240202_Plansheet - SCM Detail_20241014

Docusign Envelope ID: B12F6BE4-967F-4E36-8A2C-94897FBB58B3
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Using the runoff volume calculations in the Simple Method as described by Schueler (1987) �c _ _ _ ___- I /� J 435 WbV(�(
Where: Rv = Runoff Coefficient, in/in I 1 / \ I r= - - - / / '� / / / f 4' BLACK VINYL I I / / / ti = 5244512944A`
= Percent Impervious 1= 59.5% \11 I ` ,� - �/ / / / PERIMETER FENCE \_'� I I I 1 I I I t CB 603 _ SEAL
Rv= 0.05 + 0.009 I Rv= 0.586 PHA, 2` � - 055961
O I e`" S RaG:_ I \ i I I _ _- - J / - �/ \ \�� I I / ' ' r / ="o F Q, ,��
1.0 inch runoff volume (Required) Top of Riser I 1 I I I \ I I\ I iI I - , / / r ,'/ \ 1 ` /I // I 1 I 1 80 \ ',�.s. NCINIE �
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p I I J l l / f Ej P 4 X I r I •
Runoff volume, S=(Design rainfall) (Rv) (Drainage Area) 415.00 ft % Tem Pool Elev: -----------415.00 ft / K' B IN TICi L / / - / I / I \ �''�,,R WgpS`N
------------------ ---------- ��rrnrunnaa��.
Design Rainfall = 1.0 inch I I I I D B. t I / I
/ PLANT SLOPES WITH
Drainage Area = 20.38 acres I I \I I / oc °°°°° \ I 10/11/2024
f Ir ��✓ // /PI�yr• 4 NON-CLUMPING TURF GRASS ) , dv �t I 81 I /
Storage Required = 43,343 cu. ft. ► I I �� / / zoNl 1� t /� f v LO 1
1 Yr Water Surf Elev: 412.28 ft , / v v I N
• - Storage • 1 - • • • - • • (Provided) 1 I I I / / U IA�� / 1 v v) \ 6 1 I \ 430
I / H S. / /�, N / ° vv vvvvv / ° N \ 1 U
Depth PPE SA (SF) Top Temp Pool SA (SF) Volume (CF) Elevation �r\�I / / NGS I t1 IN 27$ I /�/ / ° I o° I ` 82 E
I 0 I / �' •� 1 / / I /�' v I �v I d- 20 PRIVATE ,',, �o i -�- --• o
1.81 17,398 27,514 43,343 411.81 Perm Pool --------------410.00 ft / , °
------- I I' I �� , 11- /1 / / 222 J.P. ° I DRAINAGE AND m o Ui
Size Water e • . • • • . • \� I voo' I I O�' { t I I PUBLIC SCM ACCESS , t0 o
Q =CdA 2 h i/z (Orifice Equation; Cd=0.60; h = Ho/3) �i�/�`� , l V J I l �- �^ `I /1 // 18" THICK I "'" I & MAINTENANCE 83 ` 1 _ w U E
2.75 Orifice Diameter(inches) ____ , / / �( �o� i I I �o � / o MIN. CLASS 405 r 1 �- F_
4.00 ft / / O A FES 600 _
EASEMENT z
1.70 Ho (Driving Head to Centroid of Orifice) (ft) 5.00 ft 1, 1 / ^<\ „ �� B RIP RAP +50 I �� - 4--
0.57 Ho/ 3 Per orifice equation recommendation in NCDEQ SWM Design Manual, Part 61 LF of ' 1' 0 uU f° (n U) U)
( q g :.
o I �i / 0 \ / ,� ro ' , 1 4+50 _ _ w %J N
0.15 Q1.0" Drawdown Rate (cfs) ; 24 RCP @ 0.51 /o l I / I \ �� i �o / / 3:1 I I - 36^RCP 5+ 4.03 a LL z w w w
0 0. I / , I <l l I f I N Mi O
43.343 Water Quality Volume (V, 2.75 inch Invert Out: 409.00 ft f / / / 11 rko o -� - _ woo ,� Z Z
i / / l r T\ o / / Ir / / 37 ( / / p I DI 601 ** \\ - �' _ - _ a w
V / Q1" x 86,400 Drawdown Time (days) Water Quality / / \� / / 3 . / , r, ) I I ` - - - _ _�__ c� rn � o o 0
Drawdown Time (days) 2 -5 days) Fill With Concrete / / / t ' J / / ,� j 1 I \ / - J z w 5 rn U Q U U
( Y ) ( Y ) Orifice ,
Pond . 410.00 ft As Necessary / // III - -� o I / ( SCM /� I 2+50 f > / I \ 4 - _ _ / , - - a x vU] w Ln w w
I I r l / ( (WdzT POND) ` / N I J- - i � o o � O
Pond Type Wet Pond 405.50 ft I I I I \ \ I // ,� / / /� /ao . 3:1 x ,� Q Q Q
- -----------------------
o � � __ / I II I � I II / � it . / t I I I / � 'q' - / � Tug z � > � �
TSS Removal 85/° / / I I �� / / i// / I o 222 W.T. 00 / / / / ' - / _ O ,.,-,
Precast Extended Base '''
Top of Pond / Berm 417.00 ft ; 0.50 ft 405.00 ft / / III I � / � / � I b' �- - � / / " I � � I � � � - � - m CB 50vA;' � � w O � O O
Secondary Spillway Width 20.00 ft `-------------------- I I , / / 1
Bottom of Secondary Spillway 415.50 ft 2.50 ft '�►' '�--►' 2.50 ft / I II I SCM A-FES OUT , I ! / �/ ) 1 >1 / ,/ t / / I - / - / ,' / c;; � o' O o' o'
To of Riser 415.00 ft at least 1'Above TPE / II IIII / fx • I� .I' !SCM A-RISER 4'x4' o J o 0
PRECAST CONCRETE RISER _/ ' 0+00 I 0+50 ' I' x�,o I I 86 / - �, ~ z a z z
p ( ) ( ) f / I b- / LU
Riser Type / Size 4x4 ft 1+0 _ I
Top of Water Quality 411.81 ft (1" Runoff) 4 ft x 4 ft x 10 ft Tall, With a 0.5 ft Thick Precast � �/s�� _ - - \I f i/ 2 I I/ 222 Q.S. FES 500 _ J tl 1 m -►� r; 0 0 0 0
Top of Temp Pool Elev 415.00 ft Extended Base I / / / f r- - U)
Top of Veg. Shelf 411.00 ft ��,' / / \ D z z z z
t \ / / / / I I d 820 PRIVATE
�\ 1 36„ DRAINAGE _ O O O O
/ o
Permanent Pool Elevation Normal Pool 410.00 ft \� / f - - - - -
( ) , / / RcA EASEMENT J/ "' = cn cn cn cn
Water Quality Orifice Elevation & Size 410.00 ft 2.75 in _ 11 \ Oho , i / / r /� - - (D
/ CB502 / > > > > >
SecondaryOrifice Elevation & Size Rise & Span) NA ft 0.00 inch 0.00 inch 1 �a�o 00 �i ��/ / / _ - / \ o w w w w
" Rise "Span VEGETATIVE SHELF �/ - 36"RCP CB503'
Bottom of Veg. Shelf 410.00 ft \ ! / / / �3 _T �(=st2�0 , i r
7\ // / p'`� \ ti 42�r - ` - _ 36„RCP
PLANTING PLAN LEGEND _ / / i - �� o _ D1501 g , I e w
Top of Sediment Storage / Pond Bottom 405.50 ft / / _ / / 414- r- - - - -� 'r 2 / >_ o N N N
g3 - 7-L1/ / ---/----- -----1 --- - --- r / K \
Bottom of Sediment Storage 404.50 ft (Min 1 ft) NNO 7t /
/ / / / / / .� Q ------L�=�-- y�---------__ / _�- t 2 Q ll� M •--�
QUILL SEDGE �--<-E / 1 EMERGENCY - - _ - _ ��=----r- - _�___ U o N N o .�
Invert Out of Riser 409.00 ft > > \ -r _ _ - - / ' \ / Q
/ / 3 / / I SPILLWAY _ � r\ rn o
(CEREZ TENERA) i / I
Outlet Pipe Size 24.00 in Diameter RCP i i /' / 1 p
Outlet Pipe Length & Slope 61.00 ft 0.51 % SCALE 1 -40 � DATE
WHITE TURTLEHEAD >
Downstream Outlet Elevation 408.69 ft SCM A PLAN VIEW 06 14 2024
1 Yr Water Surface Elev/ Peak Flow (CFS) 412.28 ft 0.29 CFS / (CHELONE GLABRA) 0 40' 80' SCALE: 1" = 40' 0
0
10 Yr Water Surface Elev Peak Flow (CFS) 415.08 ft 1.77 CFS 435 435 } DRAWN BY
25 Yr Water Surface Elev Peak Flow (CFS) 415.23 ft 6.47 CFS D D D D JOE PYE WEED
100 Yr Water Surface Elev Peak Flow (CFS) 415.80 ft 45.88 CFS D D p (EUPAT' FISTULOSUS) 331
• • • DESIGNED BY
Top of Riser: 415.00 2.75 in WQ Orifice Elev Planting Summary Requirements • 331
Top of WQ Pool: 411.81 410.00 10' Berm 417.00 Dam / Berm Non-Clumping Turf Grass 430 _ _4 • CHECKED BY
6' shelf Length= 444 Area of Shelf= 2664 SF (50 Plants per 200 SF of Area) TOP 419.97 r
100 Yr 415.80 Quantity Type Root Common Name Scientific Name Planting Size Notes INV IN 412.84 FIR (CB 602) • 331
Spillway 415.23 222 Herbaceous Container Quill Sedge CarexTenera 4"Pot 24"-36"OC INV OUT 412.74 TO (FES 600) • • SCALE
25 Yr 415.23 222 Herbaceous Container White Turtlehead Chelone Glabra 4"Pot 24"-36"OC /
H: 1" = 40'
_____ 10 Yr 415.08 222 Herbaceous Container Joe Pye Weed Eupat' Fistulosus 4"Pot 24"-36"OC EXISTING GRADE / V: 1" = 4'
-------------- --- ------------------
1 Yr 412.28 SC - S x
Pond Bottom 425 TOP 415.50 425 •
405.50
See Plan for 100 Yr Flow in Spillway 9.86 cfs 4:1 Side Slopes INV OUT 409.00 (TO SCM A- FES - UT) PROPOSED GRADE 74
accurate outlet design 10 Yr Flow in Spillway 0.00 cfs 32 ft
Top of Pond 417.00 20 ft
-----------,---------------------- ------------------- -----------
1 y 1.20 ft i TOP OF BERM
Inv Out: --------------- ELEV: 417.00' a
408.69 100 Yr Water Surf Elev:_•415.80 ft 420 _ 420
------------
10 Yr Water Surf Elev__•415.08 ft __ ______________
----------ft-- -- -- '
EMERGENCY SPILLWAY TRASH RACK / FES 600
TOP 415.63
En
Spillway Elevation 415.50 ft ELEV: 415.50' / INV IN 412. 0 FIR(DI 601 **)
Perm Pool Sediment Bottom Invert Out: 409.00 61 LF of 24" RCP @ p Y
410.00 404.50 Base: 405.00 0.51% Spillway Liner to be either Class A Riprap, NAG P550 or approved equal. SPILLWAY DETAIL ✓
/ J 100 YR ELEV: 415.80 0
2' MIN T w
• • • - 415 415
Riser Dimensions Weight of Structure Displaced Volume / 0 5.08 J En
Outside Width 5.00 ft Walls = 13,500 LBS V = LxWx HT = C.F. 25 R ELEV: 415.23' M Q ~
( ) CM A- FES -OUT �;� 6.1 VEG. z
Inside Width 4.00 ft Base = 7,500 LBS TOP 410.94 SHELF � O
Outside Length 5.00 ft FILL= 8,400 Ibs Displaced Water = INV IN 408.69 FIR(SCM A- RISER (4'x4')) 1 YR ELEV: 412.28' 113 LF RCP 0 � °
Inside Length 4.00 ft C.F. * 62.4 PCF = LBS 3611 O-RING@ GASKET U
Height 10.00 ft Outlet Pipe= 236 LBS WATER QUALITY ELEV: 411.8 54 LF 1.15/° a
Base Thick' (ft) 0.50 ft WQ Orifice= LBS Add 15% Factor of Safety 410 PERM. POOL ELEV: 410.00' _ 36" O- ING GASKETED CP 410 < 0
Wall Thick' (ft) 0.50 ft / N @ 0.8 %
VELOCITY DISSIPATOR PAD O Z -
Ext Base (ft) 2.50 ft Weir#1 = 0 LBS V = 263 C.F. 2.75"WQ ORIFICE c+� `s' VELOCITY DISSIPATOR PAD z
SEE SHEET C4.10 J Q /n
Areas removed from Riser Weir#2 = 0 LBS Disp. Water = 16,380 LBS ELEV: 410.00' SEE SHEET C4.10 J
Outlet Pipe 3.14 ft Weir#3 = 0 LBS 15% F.S. = 2,457 LBS ~� a
z
WQ Orifice 0.04 ft Weir#4 = 0 LBS > �
Orifice #1 0.00 ft Other#1 = 0 LBS Safety Factor 1.55 405 BOTTOM POND ELEV: 4 5.50 405 OU 8
Orifice #2 0.00 ft 61 LF T BOTTOM
r Orifice #3 0.00 ft Weight= 29,161 LBS Weight= 18,837 LBS
0 24" O-RING GASKETED RCP J
3 18" HICK MIN. 6' WID� z O a
Cl) Orifice #4 0.00 ft Precast Concrete Riser Structure to be 4 ft x 4 ft x 10 ft Tall, With a 0.5 ft Thick Precast @ 0.50% 0
cu CL S B RIP RAP, SE BOTTOM FOREBAY @ ENTRANCE ELEV: 405.00 z Z)
Other 0.00 ft Extended Base SEE SHEET C6.1 FOR CONCR TE SHEET C6.10 FOR DETAIL BOTTOM FOREBAY @ EXIT ELEV: 406.00' w Q o °
CRADLE, FIL ER DIAPHRAGM, AND BASE ELEV: 4 5.00' I I U)
FILL WITH 3,0 0 PSI SEDIMENT BOTTOM @ ENTRANCE ELEV: 404.00 Uj
> DAM EMBANKMENT SPECIFICATIONS LLj o
400 CONCRETE T INVERT 409.00' SEDIMENT BOTTOM @ EXIT ELEV: 405.00' 400 J �j 2i
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0 40 HORIZ SCALE: 1"=40'
Q PROFILE SCALE VERT SCALE: 1"=4 a
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ACCORDANCE WITH ALL TOWN OF a
U_ YOUNGSVILLE, FRANKLIN COUNTY,
NCDEQ AND NCDOT STANDARDS,
SPECIFICATIONS, AND DETAILS
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