The URL can be used to link to this page

Home My WebLink AboutSW8960916_Historical File_20010208Telephone (910) 754-6324 Facsimile (910) 754-2121 HOUSTON and ASSOCIATES, P.A. Consulting Engineers SHALLO=, NORTH CAROLINA 28459 117 Pine Street Post Office Box 627 Monday, February 5, 2001 Ms. Noelle Lutheran Division of Water Quality NC Department of Environment and Natural Resources 127 Cardinal Drive Extension Wilmington, North Carolina 28405-3845 Subject: Owendon Plantation - SW8 960916 MOD Brunswick County, North Carolina Resubmittal of Sheet 2 of 6 of Plans Dear Ms. Lutheran: Enclosed are two (2) copies of Sheet 2 of 6 of the Owendon Plantation stormwater plans. This sheet has been revised, in accordance with comments received from you by telephone conversation, to eliminate all direct piping into the existing pond. It is my understanding, from our discussions, that the pipes shown on the previously submitted plan cannot be approved as shown due to a conflict with the stormwater rules regarding the piping allowed within low density projects. We trust that the revised plan conforms with the regulations and that the modified stormwater permit can be issued. Should you require any additional information, or have any comments, please contact our office and we will be happy to respond immediately. Sincerely, a .Houston, P.E. ton and Associates, P.A. Enclosures pc: Mr. Don Owen, Owendon Plantation File: 95-0443 (Owendon Plantation - Phase II EC and SW) Telephone (910) 754-6324 Facsimile (910) 754-2121 HOUSTON and ASSOCIATES, P.A. Consulting Engineers SHALLOTTE, NORTH CAROLINA 28459 117 Pine Street Post Office Box 627 Friday, December I, 2000 Ms. Linda Lewis, Environmental Engineer Division of Water Quality N. C. Department of Environment and Natural Resources 127 Cardinal Drive Extension Wilmington, North Carolina 28405 Subject: Owendon Plantation, Phase 2 Brunswick County, North Carolina Modification to Stormwater Project NJ. SW8 960916 MOO Dear Ms. Lewis: P Enclosed are two copies each of the revised subject project Stormwater Permit Application, Low Density Supplement, applicable page of the project deed restrictions, calculations, and Stormwater Plans. Also enclosed is a check in the amount of $420.00 to cover the application fee. The revisions have been made to include fifty (50) additional lots and to modify the interior roadways from the original layout. The additional lots are possible due to the final delineation of wetlands. The enclosed copy of a page of the restrictive covenants, which indicates a maximum impervious area coverage of 3,000 square feet per lot, has been in place since the conveyance of the first lot and the deed restriction applies to all lots within the project. The permitted maximum built -upon area is currently 4,250 SF. We appreciate your attention in this matter. Should you have any comments or require any additional information, please do not hesitate to contact our office at your convenience. E. ciates, P.A. Enclosures pc: Mr. Allen Davis, COE Mr. Don Owen, Owen Ventures, Inc. File 99-0090 (Winding River, Phase 3, SW) Hydrologic and Hydraulic Calculations for O " ENDOO N PLANTATION OWMv s, Evc. BRUNSWICK COUNTY, NORTH CAROZ"A TZ000 Prepared By MOMQTDM and oc aft@a9 p.& CONSULTING ENGINEERS Shallotte, North Carolina December 2000 i3 O W V 0 W .� W N� O 0 W �! O 0 A W N -+ �'3 w 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o i o o -► o o "'0 O W W OD W W �O V U1 O O in W W N W N W O -P O N N N W .P 0 O i C11 O O V N V W V W W i W 0 06 O 'O m w i J W W OD i i v1 W W OD O OD CJI N --► W W V O-+ O a N O O O O O O O O O O O O O O O O O O W Ir C71 O O O O O O O O O O O O O O O O O O W n O O O O O O O O O O O O O O O O O O O O co co M N44- W i 0 N O N i i i V i i V N M O .i bin 6LLbooivcninin:iivVioiab�16 n N V V1 N �D U1 CJl v1 W W V V N OD O O O W W W -+ o r N V 9 Q O iD V i .P O W 6 V�� V� A N� a in : in La 6 in S a ~o V W-•(710-+rnirnWODNCnwc�jNODrn-a Qr V/ O O O O O O O O O O O O O O O O O O O O N O i <D � �p C71 O) O � W �O W Cil N W aD CJI V Vl N O 0 0 0 0 0 0 0 0 0 0 p O R CO W W Cn W N O v di)Ol W 21, S i W co Wco g j— ap P co .i N4, a O w W -L i V CA � CO O Cn a A N N Cb V N N V O O N co N coNW CA) N N C Cif N G) N 1 C!1 W O 1,, CAD as OD W i aD w 0 CD O (a] (� -4 N CA W ,P 4 Cn 01 W -4 V (n V CD OD W sy to O 3 000V�wooa�al�oN000 a � V CD V C D N OD 6 6) CA N 6 'CR W V W CO N W O -4 -N 0 CD V W N O Lo C ? 4 4h. 41 W W 4 4 4 A M {i �N W n m W O CA O co co Cn 46 W N O O N CA Co V O. W O CO N CA �A -4 -4Ln -4 CC 4 -A- -4 � rt 0 0 0 000 O O P O 0 0 0 0 0 0 Z Cn C71 (71 C11 C71 Cn C11 CT1 Cn to C1t (7t Cn Cif W C11 '"� C7D W U1 CA Vl P W � OD CD V O „�,� CA Cn CO � V V .p co w W 0-4 0CA N W C1D N C11 -+ (i1 C11 CA � � A W O da P O C11 C71 CA CA W 7 I i CA V CA C11 Wm co w— N O .A V. co w -4W o V? (71 LIZ oD � s inO C'' m co c w CO C" CD -4 CR V I = ig CD 0 ID Cq Q a O W 3 Owenclon Plantation Storm Drainage Inverts 1 1 /9/2000 Prepared By: JRH . Checked By: �w . Storm Drain Length Inv. In Inv. Out Road Elev. Culvert Diam. I.D. (msl Inches SD1 40 45.00 44.80 47.15 15 SD2 _ 30 _46.20 43.00 48.40 115 TG: 46.5 S133 160 43.00 41.00 na 18 TG A6.5 SD4 30 45.30 45.10 48.50 24 SD5 30 44.90 44.80 47.2015 SD6 30 44.20 44.10 47.45 18 SD7 40 43.60 40.80 48.60 30 TG: 45.5 S138 240 40.80 40.00 48.60 30 TG: 45.5 SD9 30 44.70 44.50 46.90 15 SD10 30 43.80 43.70 46.00 15 SD11 30 43.10 43.00 47.10 24 SD12 30 38.80 38.30 45.30 30 TGA2.8 TG:43.0 SD13 220 38.30 37.50 45.30 36 TG: 43 SD14 30 46.20 46.00 48.60 15 SD15 1 30 44.50 44.30 46.60 15 SD16 30 41.60 41.50 43.80 15 NOTE: TG designates the Top of Grate at the associated Inv. co CL 0 a E U o �c Z W ORAW,001 e1hWW14,A1 - dv6 T 711S AEllf-7iM r/r*-Ae%,V A,9- PEj4i"AAI& Ot- /WX /I76/r01 DfA'� S. u 3 i � *-1WU�6b � rZ Af 4d-* All fc�IV77{=3p' � l Y V of �0/7tlf I d/om : cif Om. ►�,�a!�O�f ✓ - -I -COW 0— -3oa F� s 5- # L= 7,�� (as�`•� A 15�v? fps �Ivac gtrF. = 3a. cis 4'E4vf vo t emr r So 12 aw ) -3 et�—s _ ✓. o Ff L = 76 F14 zip- U�` /o ' GU/ RJ614 XX2� '. V.= --- - -�; /a, - 461.:5 // , /0,) = -7,0.3 S10 Omndon Grate Inlets 1 1 /30/00 Inlet Grate Hydrology & Hydraulics Check most critical catch basin. Inlet grate sized for most critical basin will be suitable for all basins. 10-Yr Flowrate: 30.00 cfs Minimum Perimeter grate with head limited to 0.6 feet: P = Q / (C*H)^i .a where C=2.6 Perimiter: 4.6 Feet Minimum Open area of grate with head limited to 0.6 feet: A = Q / C*(2*g*H)0.5 where C=0.6 Open Area: 6.2 g 7 Owendon Plantation Culvert Hydraulics 11/9/2000 SD1 HEADWATER ELEVATION CALCULATIONS Prepared By: JRH . Checked Bv: FLOWRATE = CP5 MANNINGS n = MINCHES HEADWATER ELEVATION ASSUMING INLET CONTROL DIA. FOR CULVERT PIPE = INCHES DIA. FOR RISER= HEAD = 0.74 LENGTH OF CULVERT PIPE = 4 0 FEET HEADWATER ELEVATION = 46.36 INV. IN ELEV. OF CULVERT = 45.00 FEET INV. OUT ELEV. OF CULVERT = 44.80 FEET INLET COEF. FOR CULV. PIPE FLOW = 0.5 HEADWATER ELEVATION ASSUMING PIPE FLOW INLET COEF. FOR CULVERT INLET CONTROL = 0.6 RISER WEIR ELEVATION = 0.00 FEET HEAD = 0.61 WEIR FLOW COEF. = 0 HEADWATER ELEVATION = 45.91 TAILWATER ELEVATION = 45:30.. FEET VELOCITY= 4.13 FPS TAILWATER UNKNOWN = ZERO() HEADWATER ELEVATION ASSUMING WEIR FLOW 'SD2 (HEADWATER ELEVATION CALCULATIONS FLOWRATE= 4..33 CPS MANNINGS n = 0,012 DIA. FOR CULVERT PIPE _ ', 6 INCHES DIA. FOR RISER = 0 INCHES LENGTH OF CULVERT PIPE = 3 0 FAT INV. IN ELEV. OF CULVERT = 46.20 FEET INV. OUT ELEV. OF CULVERT = 43.00 RAT INLET COEF. FOR CULV. PIPE FLOW = INLET COEF. FOR CULVERT INLET CONTROL RISER WEIR ELEVATION = RifWEIR FLOW COEF. = INFEEr TAILWATER ELEVATION = VELOCITY= 3.53 FPS HEAD = #DIV/01 HEADWATER ELEVATION = #DIV/01 HEADWATER ELEVATION ASSUMING INLET CONTROL HEAD = 0.54 HEADWATER ELEVATION = 47.36 HEADWATER ELEVATION ASSUMING PIPE FLOW HEAD = 0.40 HEADWATER ELEVATION = 44.95 HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION = #DIV/01 ISM ELEVATION CALCULATIONS Owendon Plantation Culvert Hydraulics 1 1 /9/2000 FLOWRATE = 7. 62! CPS MANNINGS n = O.012 DIA. FOR CULVERT PIPE = 1 8 INCHES DIA. FOR RISER = 0 INCHES LENGTH OF CULVERT PIPE = 16 0 FEET INV. IN ELEV. OF CULVERT = 43.00 FEET INV. OUT ELEV. OF CULVERT= 41.00 FEET INLET COEF. FOR CULV. PIPE FLOW INLET COEF. FOR CULVERT INLET CONTROL = = ._ 0.6 RISER WEIR ELEVATION = 4 , 0 61 FEET WEIR FLOW COEF. = 0 TAILWATER ELEVATION = 42.OD. FEET VELOCITY= 4.31 FPS SD4 HEADWATER ELEVATION CALCULATIONS LOWRATE tANNINGS CP5 n = :: '- 01: 012. DIA. FOR CULVERT PIPE = 24 INCHES 7. DIA: FOR RISER = -0 INCHES LENGTH OF CULVERT PIPE = 30 FFET INV. IN ELEV. OF CULVERT = 4;&30 FEET INV. OUT ELEV. OF CULVERT = 45.10 INLET COEF. FOR CULV. PIPE FLOW INLET COEF. FOR CULVERT INLET CONTROL =: RISER WEIR ELEVATION = . FAT WEIR FLOW COEF. _ TAILWATER ELEVATION = 'FEET VELOCITY= 5.86 R'S Prepared By: JRH . Checked By: HEADWATER ELEVATION ASSUMING INLET HEAD = 0.80 HEADWATER ELEVATION = 44.55 HEADWATER ELEVATION ASSUMING PIPE FLOW HEAD = 1.15 HEADWATER ELEVATION = 43.15 HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION= #DIV/0I HEADWATER ELEVATION ASSUMING INLET CONTROL I HEAD = 1.47 HEADWATER ELEVATION n 47.77 HEADWATER ELEVATION ASSUMING PIPE FLOW HEAD = 0.97 HEADWATER ELEVATION = 46.57 HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION = #DIV/O! Owendon Plantation Culvert Hydraulics 11 /9/2000 ISD5 HEADWATER ELEVATION CALCULATIONS FLOWRATE _ ;' "6 --4'E CFS MANNINGS n= 47 2: DIA FOR CULVERT PIPE=:. -A INCHES DIA FOR RISER= INCHES ' LENGTH OF CULVERT PIPE = 3 0 FEET .'°' INV. IN ELEV. OF CULVERT = 44.90 FEET INV. OUT ELEV. OF CULVERT= 44.80 FEET INLET COEF. FOR CULV. PIPE FLOW = INLET COEF. FOR CULVERT INLET CONTROL RISER WEIR ELEVATION = FEET OFEET WEIR FLOW COEF. = TAILWATER ELEVATION = VELOCITY= 5.26 FPS ISD6 HEADWATER ELEVATION CALCULATIONS Prepared By: JRH . Checked By: HEADWATER ELEVATION ASSUMING INLET CONTROL HEAD = 1.20 HEADWATER ELEVATION = 46.72 HEADWATER ELEVATION ASSUMING PIPE FLOW HEAD = 0.90 HEADWATER ELEVATION = 46.20 HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION = #DIV/01 FLOWRATE = 1.7.15 CF5 MANNINGS n = D:01 HEADWATER ELEVATION ASSUMING INLET CONTROL DIA. FOR CULVERT PIPE = 1 8. INCHES DIA. FOR RISER= INCHES HEAD = 4.06 LENGTH OF CULVERT PIPE = 3.0 FEET HEADWATER ELEVATION = 49.01 INV. IN ELEV. OF CULVERT = 44.20 FEET INV. OUT ELEV. OF CULVERT = 44,10 FAT INLET COEF. FOR CULV. PIPE FLOW = ...... . 0 `5 HEADWATER ELEVATION ASSUMING PIPE FLOW INLET COEF. FOR CULVERT INLET CONTROL-..:' 0.6 RISER WEIR ELEVATION = 0.0:0: FEET HEAD = 2,88 WEIR FLOW COEF. _ HEADWATER ELEVATION = 47.48 TAILWATER ELEVATION = 44 60 FEET VELOCITY= 9.70 FIBS TAILWATER UNKNOWN = ZERO (0) HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION = #DIV/01 !D Owendon Plantation Culvert Hydraulics 1 1 /9/2000 �SD7 HEADWATER ELEVATION CALCULATIONS IMANNIN(a.1 n = DIA. FOR CULVERT PIPE = INCHES DIA FOR RISER = ti INCHES LENGTH OF CULVERT PIPE = 44 FEET INV. IN ELEV. OF CULVERT = 43.60 FEET INV. OUT ELEV. OF CULVERT = :80 FEET INLET COEF. FOR CULV. PIPE FLOW = INLET COEF. FOR CULVERT INLET CONTROL RISER WEIR ELEVATION = FEET ip, WEIR FLOW COEF. _ TAILWATER ELEVATION = 45.42 FEET VELOCITY= 7.76 FFS ELEVATION CALCULATIONS Prepared By: JRH . Checked By: HEADWATER ELEVATION ASSUMING INLET HEAD = 2.59 HEADWATER ELEVATION = 47.44 HEADWATER ELEVATION ASSUMING PIPE FLOW HEAD = 1.69 HEADWATER ELEVATION = 47.12 HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION = #DIV/01 FLOWRATE = O"s MANNINGS n = HEADWATER ELEVATION ASSUMING INLET COM DIA FOR CULVERT PIPE = INCHES DIA FOR RISER = ... INCHES HEAD = 2.80 LENGTH OF CULVERT PIPE = 240FEET HEADWATER ELEVATION = 44.85 INV. IN ELEV. OF CULVERT = 40:80 FEET INV. OUT ELEV. OF CULVERT = 0.00 FEET INLET COEF. FOR CULV. PIPE FLOW = a.. 5 HEADWATER ELEVATION ASSUMING PIPE FLOW INLET COEF. FOR CULVERT INLET CONTROL = 0 6 RISER WEIR ELEVATION = q, 00 FEET HEAD = 3.42 WEIR FLOW COEF. = 0 HEADWATER ELEVATION = 45.42 TAILWATER ELEVATION = 42-: FEET VELOCITY= 8.06 FFS TAILWATER UNKNOWN = ZERO (0) HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION = #DIV/01 ISD9 ELEVATION CALCULATIONS Owendon Plantation Culvert Hydraulics 1 1 /9/2000 = 5 -17 CFS IFLOWRATE MANNINGS n = 0.012. DIA. FOR CULVERT PIPE = 1 5' INCHES DIA. FOR RISER = 0 INCHES LENGTH OF CULVERT PIPE = 3 Q FEET INV. IN ELEV. OF CULVERT = 44. 7 0 FEET INV. OUT ELEV. OF CULVERT= 44.50 FEET INLET COEF. FOR CULV. PIPE FLOW INLET COEF. FOR CULVERT INLET CONTROL= RISER WEIR ELEVATION = ="Q f' FEET WEIR FLOW COEF. TAILWATER ELEVATION = -410. a. FEET VELOCITY= 4.21 FPS ISD10 TER ELEVATION CALCULATIONS Prepared By: JRH . Checked By: HEADWATER ELEVATION ASSUMING INLET CONTROL HEAD = 0.77 HEADWATER ELEVATION = 46.09 HEADWATER ELEVATION ASSUMING PIPE FLOW HEAD = 0.58 HEADWATER ELEVATION = 45.58 HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION = #DIV/01 FLOWRATE= 7:.48 CF8 MANNINGS n = 4:.01 HEADWATER ELEVATION ASSUMING INLET CON I DIA. FOR CULVERT PIPE = 15 INCHES DIA FOR RISER = 0 INCHES HEAD = 1.60 LENGTH OF CULVERT PIPE = 3 0 FEET HEADWATER ELEVATION = 46.03 INV. IN ELEV. OF CULVERT = 43.80} FEET INV. OUT ELEV. OF CULVERT = 43:70 FEET INLET COEF. FOR CULV. PIPE FLOW = 0.5 HEADWATER ELEVATION ASSUMING PIPE FLOW INLET COEF. FOR CULVERT INLET CONTROL = . 0.6 RISER WEIR ELEVATION = = ;:;Q:00 FEET HEAD = 1.21 WEIR FLOW COEF. = 0 HEADWATER ELEVATION = 45.41 TAILWATER ELEVATION = ' 4} go FEET VELOCITY= 6.10 FPS TAILWATER UNKNOWN = ZERO (0) HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION = #DIV/01 IZ Owendon Plantation Culvert Hydraulics 1 1 /9/2000 ISD11 HEADWATER ELEVATION CALCULATIONS FLOWRATE = :' `85§ CPS MANNINGS n DIA. FOR CULVERT PIPE _ "4 INCHES DIA. FOR RISER =?` INCHES LENGTH OF CULVERT PIPE = 3 0 FEET INV. IN ELEV. OF CULVERT = 43.10 FEET INV. OUT ELEV. OF CULVERT = 43.00 FEET INLET COEF. FOR CULV. PIPE FLOW = INLET COEF. FOR CULVERT INLET CONTROL= RISER WEIR ELEVATION = =` : FEET WEIR FLOW COEF. TAILWATER ELEVATION = a FEET VELOCITY= 7.91 R'S ISD12 HEADWATER ELEVATION CALCULATIONS Prepared By: JRH . Checked By: HEADWATER ELATION ASSUM!NG INLET HEAD = 2.70 HEADWATER ELEVATION = 46.80 HEADWATER ELEVATION ASSUMING PIPE FLOW HEAD = 1.77 HEADWATER ELEVATION = 45.27 HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION= #DIV/01 FLOWRATE= 30.28 CFS MANNINGS n = . o'n i 2 HEADWATER ELEVATION ASSUMING INLET CONTROL DIA. FOR CULVERT PIPE _ `., .3 0 INCHES DIA. FOR RISER= 0 INCHES HEAD = 1.64 LENGTH OF CULVERT PIPE _ 30 I1CT HEADWATER ELEVATION = 41.69 INV. IN ELEV. OF CULVERT = 38.80 FEET INV. OUT ELEV. OF CULVERT = $8.30, FEET INLET COEF. FOR CULV. PIPE FLOW = ❑ .5' HEADWATER ELEVATION ASSUMING PIPE FLOW INLET COEF. FOR CULVERT INLET CONTROL = 0.6 RISER WEIR ELEVATION = -0. 0'0 RAT HEAD = 1.03 WEIR FLOW COEF. = p HEADWATER ELEVATION = 45.46 TAILWATER ELEVATION = : 4:4: 45 FEET VELOCITY= 6.17 R'S TAILWATER UNKNOWN = ZEBQA HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION = #DIV/01 13 Omndon Plantation Culvert Hydraulics 11/9/2000 SD13 HEADWATER ELEVATION CALCULATIONS FLOWRATE _.48; CPS MANNINGS. n DIA. FOR CULVERT PIPE _ -:: 3'.6:, INCHES DIA. FOR RISER = 0 INCHES LENGTH OF CULVERT PIPE = 2 2 0 FEET INV. INELEV. OFCULVERT = 3 8.3 0 FEET INV. OUT ELEV. OF CULVERT = 37,50 FEET INLET COEF. FOR CULV. PIPE FLOW = 0: 5 INLET COEF. FOR CULVERT INLET CONTROL = 0.6 RISER WEIR ELEVATION = 0.00 FEET WEIR FLOW COEF. = 0 TAILWATER ELEVATION = 42.00 FEET VELOCITY= 7.42 FPS D14 ELEVATION CALCULATIONS FLOWRATE= 6.33 CPS MANNINGS n = 0:012 DIA. FOR CULVERT PIPE = 1 5 INCHES DIA. FOR RISER = 0 INCHES LENGTH OF CULVERT PIPE = 3 0 FEET INV. IN ELEV. OF CULVERT = 46.20 FEET INV. OUT ELEV. OF CULVERT = 46.00 FEET INLET COEF. FOR CULV. PIPE FLOW INLET COEF. FOR CULVERT INLET CONTROL = ;(i}6: RISER WEIR ELEVATION = :-:,0 0.0 FEET WEIR FLOW COEF. _ - 0, TAILWATER ELEVATION = 46';'5'a' FEET VELOCITY= 5.16 R'S Prepared By. JRH . Checked By. HEADWATER ELEVATION ASSUMING INLET HEAD = 2.38 HEADWATER ELEVATION = 42.18 HEADWATER ELEVATION ASSUMING PIPE FLOW HEAD = 2.45 HEADWATER ELEVATION = 44.45 HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION= #DIV/01 HEADWATER ELEVATION ASSUMING INLET HEAD= 1.15 HEADWATER ELEVATION 47.97 HEADWATER ELEVATION ASSUMING PIPE FLOW HEAD = 0.87 HEADWATER ELEVATION = 47.37 HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION= #DIV/01 rm Owendon Plantation Culvert Hydraulics 1 1 /9/2000 SD15 HEADWATER ELEVATION CALCULATIONS _ _.: fi4 CPS IFLOWRATE MANNINGS n DIA. FOR CULVERT PIPE_ = .-1<:5 INCHES DIA. FOR RISER = a: INCHES LENGTH OF CULVERT PIPE = 3 0 FEET INV. IN ELEV. OF CULVERT = 44.50 FEET INV. OUT ELEV. OF CULVERT = 44.30 FEET INLET COEF. FOR CULV. PIPE FLOW INLET COEF. FOR CULVERT INLET CONTROL RISER WEIR ELEVATION = :0 00 FEET WEIR FLOW COEF. TAILWATER ELEVATION = 4'4:go. FEET VELOCITY= 6.23 FPS ISM ELEVATION CALCULATIONS LOWRATE = 6 - 3 7 CFIS AANNINGS n = )IA. FOR CULVERT PIPE = INCHES IIA. FOR RISER = INCHES ENGTH OF CULVERT PIPE _? FEET W. IN ELEV. OF CULVERT = 41.W FEEL' SIV. OUT ELEV. OF CULVERT = 41.E FEET VLET COEF. FOR CULV. PIPE FLOW = VLET COEF. FOR CULVERT INLET CONTROL tISER WEIR ELEVATION = FEET mFEEr VEIR FLOW COEF. = AILWATER ELEVATION = 'EELOCITY= 5.19 FPS Prepared By: JRH . Checked By: HEADWATER ELEVATION ASSUMING INLET HEAD = 1.67 HEADWATER ELEVATION = 46.80 HEADWATER ELEVATION ASSUMING PIPE FLOW HEAD = 1.26 HEADWATER ELEVATION = 46.06 HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION= #DIV/01 HEADWATER ELEVATION ASSUMING INLET HEAD= 1.16 HEADWATER ELEVATION = 43.39 HEADWATER ELEVATION ASSUMING PIPE FLOW HEAD = 0.88 HEADWATER ELEVATION = 42.88 HEADWATER ELEVATION ASSUMING WEIR FLOW HEAD = #DIV/01 HEADWATER ELEVATION= #DIV/01