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Home My WebLink AboutNCG021049014 i \ Stage Storage Curve ♦ �� / EMERGENCY SPILLWAY DETAIL se-17 � ® \ EMERGENCY SPILLWAY DETAIL � LEVEL CONTROL SECTION CHUTE SECTION 854.00 _ / N.T.S. -'TOP s54 000)STRUCTURE _ 2� N.T.S. F- N \ S Q) J X 0 co EMERGENC SPILLWAY 852.30) 852.00 � 26.81 ft. 19.98 ft. '`♦ X 1y 1 .00ft. Freeboard p.24 ftJ_ Q NAD-83 CREST OF POND �� .70 ft. 1 1 1 . Oft. FTreeboard NC-s Cs ` \ EL. 854.00 \`� 2 20.00 ft. 2 15.00 ft. 2 T LU 850.00 PRINCIPAL SPILLWAY(850.30) - ♦ `'♦ 0%CLEAN OUT EL. 848.39 Channel Design Non-Erodible Channel Design Non-Erodible \ \ \ ♦ ' �,♦ CLEAN OUT LEVEL(848.39) 1 ;�" Channel Type: Trapezoidal, Equal Side Slopes Channel Type: Trapezoidal, Equal Side Slopes 848.00 LEI PROTECTION „o Dimensions: Left Side Slope 2.00:1 Dimensions: Left Side Slope 2.00:1 `'"♦,� \ 1 I \ \ Right Side Slope 2.00:1 Right Side Slope 2.00:1 \ ♦� NORMAL POOL EL. 850.30 Base Dimension: 20.00 Base Dimension: 15.00l p N Wetted Perimeter: 23.14 Wetted Perimeter: 16.09 N a o SKIMMER�� \ Area of Wetted Cross Section: 15.01 Area of Wetted Cross Section: 3.78 p� \ cn 846.00 EMERGENCY SPILLWAY �,�' \ Channel Slope: 0.1000 Channel Slope: 6.1200 0 0.40 0.80 1.20 1.60 2.00 0.0 _ \ _ Q LEVEL CONTROL SECTION EL. -852.30 � tii � / \ �� Manning s n of Channel: 0.0175 Manning s n of Channel: 0.0175 \ / � �. \ Discharge: 30.22 cfs Discharge: 30.22 cfs Accumulative Storage (Acre-Ft) ±r, x I / i � I �' BOTTOM OF POND EL. 846.00 Depth of Flow: 0.70 feet Depth of Flow: 0.24 feet � I PRINCIPLE SPILLWAY 72" SQUARE UF} " ' Velocity: 2.01 fps Velocity: 8.00 fps Storage volume computations CONCRETE RISER W/TRASH RACK tz� of '� Channel Lining: Grouted Rock Rip Rap Channel Lining: Grouted Rock Rip Rap m AND 304 FT OF 30 IN. C1VIP / SB-17 ' r POROUS BAFFLES (TYP.) Freeboard: 1.00 feet Freeboard: 1.0)0 feet �� 'I in ELEV. Width LENGTH AREA AVG. INTERVAL STORAGE ACC, STAGE SLOPE DRAIN -_-,6� CUTOFF TRENCH (ft) (ft) (ft) (ac) AREA (ft) (ac-ft) STORAGE INTERVAL (ac) (ac-ft) (ft) \ / \ DITCH DA-86\ EXISTING GROUND ABUTMENTS \ � ( ) 846.00 N/A N/A 0.1480 \ 1.o �♦ R \ 847.00 N/A N/A 0.1678 0.1579 1.00 0.1541 0.1541 1.00 \ ® \ 0.1778 1.00 0.1741 0.3282 2.00 R \ FILL MATERIAL 848.00 N/A N/A 0.1879 0.1920 0.39 0.0753 0.4034 2.39♦ 848.39 N/A N/A 0.1960 CO ♦♦ F 2 MAXIMUM IF NOT CUT TO BEDROCK o.19a3 os1 0.1190 0.5225 3.0o v, \ ♦ \ 849.00 N/A N/A 0.2086 � 12 12 F 0.2193 1.00 0.2152 0.7377 4.00 z z z z B ®® \ 850.00 N/A N/A 0.2300 W W W W \ v '` F F \ / 850.30 N/A N/A 0.2366 0.2333 0.30 0.0700 0.8077 4.30 9 9 0 0 \ \ �/� ®♦ (G 1\ 851.00 N/A N/A 0.2521 0.2410 0.70 0.1669 0.9746 5.00 0 L)® � � � ®♦ F 1 852.00 N/A N/A 0.2748 0.2634 1.00 0.2592 1,2337 6.00 � ♦ \ F 0.2783 0.30 0.0835 1.3172 6.30 0 0 0 0 \ \ CLEAN WATER DIVERSION >�,® � E a52.3o N/A N/A 0.2818 / i ♦,� F 853.00 N/A N/A 0.2983 a 0_ a a \ 0.2865 0.70 0.1987 1.5159 7.00 o w w w w 2 0.3085 1.00 0.3062 1.8221 8.00 _ V) (n N N \ �•c-® L 854.00 N/A N/A 0.3187 0) w w w w \ \ SUITABLE EARTHEN MATERIAL COMPACTED TO 95% OF STANDARD PROCTOR MAX. DRY DENSITY N N N PLAN VIEW : SEDIMENT BASIN NO. 17 WITHIN ±2% OPTIMUM MOISTURE o N CUTOFF TRENCH DETAIL CONTENT SCALE: 1" = 50' N.T.S. SEDIMENT BASIN NO. 17 PRINCIPLE SPILLWAY Z� N M Outflow 950 950 Total Discharge: 48.58 cfs Water Surface Elevation: 851,30 ft 900 50% CLEAN OUT EL. 848.39 900 Tailwater Elevation: 0.00 ft Detention Base Elevation: 0.00 ft Q25 HWD EL. 851.30 NORMAL POOL EL. 850.30 EXISTING GROUND Outlet#1: SEDIMENT BASIN 17, Drop Pipe 900 50%CLEAN OUT EL. 848.39 900 Riser Top Elev: 850.30 ft Riser Length: 72.00 in OUTLET PROTECTION Q25 HWD EL. 851.30 NORMAL POOL EL. 850.30 Riser Width: 72.00 in 20 ft. 850 CREST 85 850 Orifice Coefficient: 0.50 EXISTING GROUND SKIMMER � 2� Weir Coefficient: 3.33 BOTTOM EL. = 846.0 Culvert Length: 304.00 ft ST 854.0 Culvert Diameter: 30.00 in rx 85 _. _ 850 Culvert Invert In: 847.00 ft 1% 1% BOTTOM EL. 846.0 Culvert Invert Out: 843.95 ft PRINCIPAL SPILLWAY 800 800 Culvert Friction Coefficient: 0.02 72" SQUARE CONCRETE RISER Culvert Entrance Loss Coefficient: 0.90 W/ TRASH RACK AND 304 FT OF 30 IN CMP CLASS B STONE 0+00 0+50 1+00 1+50 2+00 2+50 3+00 3+50 800 1 800 Cross Section B-B' 0+00 0+50 1+00 1+50 2+00 2+50 3+00 3+50 4+00 Scale: 1" = 50' N � p Cross Section A-A � � m Scale: 1" = 50' Y Q w a °moo a RISER DETAILS 14ft. _ z TRASH RACK EL. 854.00 RISER BUOYANCY CALCULATION z z w U O SKIMMER --�---- Y I;-i w z 1'FREEBOARD v1 Q w FW ¢ O w Demonstrate adequate stability by showing the downward force is a minimum of 1.25 w 1 = a 0 Skimmer Design - Sediment Basin SB-17 ❑ EMERGENCY SPILLWAY DEPTH EMERGENCY SPILLWAY EL.852.30 times the up ward force. `7' `` ❑ - �- -- -- -- Desired Skimmer Drawdown Time 3 days NORMAL POOL EL. 850.30SZ �� ❑❑ ❑ V FREEBOARD MIN. Desired Skimmer Drawdown Rate 9,774 cf/day I I \ 2 2 Downward Force (structure weight) > 1.25 x Upward Force (buoyancy) Skimmer Size 3 in EXISTING GRADE I I 1 F_ 1 72" Square Concrete Riser Head on Orifice 0.25 ft 50% CLEANOUT EL. 848.39 I i Height= Say 4' I \\ \ Weight= 11,320 lb Calculated Orifice Diameter 1.680 in 72"SQUARE I I \ \ \\\ \\\ \ \ \ \ \\\ \ \\\\ \\ \\\\\ \\\\\ \\� Where: Actual Orifice Diameter(1/4 inch increments) 2.25 in 4'X 4'X 1' CLAGS B STONE I I \ \ \\ \\ \ \ \ \ \ ` I 1 -, I RISER CONCRETE I 30" DIA (BARREL CMP Q Actua I Skimmer Drawdown Time 3.08 days L„ \{ 1 I 4'30' ---------------I Riser Weight= 11,320 lb Z _ a Required Volume 18,036 cf BOTTOM OF POND EL. 846.00 Weight of Concrete Base = (Length x Width x Depth)x Unit Weight of Concrete (n Q d a ' 4 e..•.. ..d ••• .• • (� .• a •. .de' , WATER ENTRY UNIT STABILIZED OUTLET Weight of Concrete Anti-Flotation Base= (7 ft x 7 ft x 0.5 ft) x 150 Ib/ft3= 3,675 lb Z Q Q WITH TRASH SCREEN GENERAL NOTES: ANTI-FLOTATION BASE (IF APPLICABLE) CUT OFF TRENCH V 1. PROPER DESIGN MUST BE COMPLETED TO MINIMIZE PIPING AROUND DISCHARGE ELEVATION VIEW n O W PIPE. Structure Weight= 11,320 lb+ 3,675 lb= 14,995 lb 2. PROPER ORIFICE OPENING MUST BE SELECTED TO ENSURE POND DRAINS IN CORRECT AMOUNT OF TIME. MODIFICATIONS MAY BE REQUIRED IF FIELD N.T.S. O Z - CONDITIONS WARRANT A CHANGE. W LL 3. EMBANKMENT MUST BE COMPACTED TO DESIGN SPECIFICATIONS. Buoyancy = Displacement Volume of Riser x 62.4 lb/ft3 rr '�J 4. EMERGENCY SPILLWAY MUST BE CORRECTLY SIZED AND EROSION PROTECTION ORIFICE OPENING INSIDE THE INSTALLED. 5. EROSION PROTECTION MUST BE INSTALLED ALONG THE EMBANKMENT AND AT THE HORIZONTAL TUBE WITH A DISCHARGE END OF THE PIPE. Buoyancy = 144 ft3 x 62.4 lb/ft'= 8,985.6 lb V Z Q a CONSTANT HYDRAULIC HEAD R ANTI-FLOTATION BASE (IF APPLICABLE) 6. INSPECT SYSTEM REGULARLY TO ENSURE IT IS FUNCTIONING IN A CORRECT 72"SQUARE CONCRETE RISE MANNER. M 7. EIGHT SIZES OF SKIMMERS ARE AVAILABLE, REFER TO THE FLOW SHEET, CUT Downward Force (structure weight) > 1.25 x Upward Force (buoyancy) ` SHEET, AND INSTRUCTIONS ON WEB SITE FOR EACH SIZE. . . r SCHEDULE 40 PVC PIPE • �' d • '. ' L THEN EMBANKMENT •• .•• -(BARREL OR ARM) y 4. 'e r MAXIMUM HEIGHT of FLOAT WHEN No • x. •.e. . e 14,995 lb > 8,985.6 lb x 1.25 = Z Z Q EMERGENCY SPILLWAY OTHER STORM WATER DISCHARGE OPENINGS EXIST ;e. ' 14,995 lb> 11,232 Ib W LEXIBLE HOSE (MAJOR STORM EVENT) FLOAT • ' NOTES 'J Q INVERT OF LOWEST STORM a • e � � W - GRATE WATER DISCHARGE OPENING PVC VENT fe' .d \ ' e ' 1. Portland cement concrete (type II recommended) for the inlet base shall have a minimum compressive I W H_IfI--HII (MINOR STORM EVENT) \ strength of 4,000 psi. O Z FLOAT TOP VIEW II FLEXIBLE HOSE MUST BE 6 0" 7'-0„ 2. Where corrugated aluminum or aluminized steel pipe is used, all areas where the pipe is to be in contact with 0 Z SECURELY FASTENED To concrete shall be painted with a black bituminous enamel paint. VC VENT (PIPE � STORM WATER THE WATER QUALITY . p p I- Q i DI o OPRGE ENING DISCHARGE OPENING \ \ \ \ \ 3. Riser to be constructed according to the Riser Details. -� �\ d••'. : 4. Skimmer Sizes and Orifice Diameters are calculated based on the NCDEQ Design Methodology and will be W Q OUTLET PIPE ' a _ -_ = e ar •• i BARREL CMP reviewed and approved by the Engineer once a Skimmer supplier/manufacturer has been chosen. .d - LEXIBLE HOSE L = 1.4 X DEPTH d'. . ' . `. . ••.. ' .., - TO THE OVERFLOW d d • •'. '•': . .•r.. t`�}}}1I1}ift10 I- MINIMUM LENGTH APPLIES e ' ;•' , • ' •' �� /Q d I hereby certify that this document was + /� r. WATER ENTRY UNIT prepared by me or under my direct personal . , {r'�'� ' '�'- SCHEDULE 40 PVC PIPE a ' •. ++. ++ �Sj + ,/��,�. ' L (BARREL OR ARM) supervision and is Correct to the best of my I- �•'� Q `'., ±, -I LI I-Et�l -E:tl I- - - - - knowled e a d belief and that I am a duly END VIEW SIDE VIEW MAINTAIN DEPRESSION TO PLAN VIEW sEAL (NO SCALE) MINIMIZE CHANCE OF SKIMMER BECOMING STUCK N.T.S. laws sftS�Warolrtrinader the =� • 04$820 .��_ SHEET NUMBER DRAWN BY T.R.EVANS 1D/10 "' LDFAIRCLOTH &SON INC. FAIRCLOTH SKIMMER DISCHARGE SYSTEM WITH OUTLET WWW.FAIRCLOTHSKIMMER.COM � ` '�GaN tiQ:•.+� STRUCTURE TELEPHONE ()19)732-1244 (Signature) ,.�� •++ + ,, FAX: 919 732-1266 EMAIL: WARREN®FAIRCLOTHSKIMMER,COM Date: 3/13/2024 .,� ,+ , � ,,�* 02C0-D006 Ot}