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HomeMy WebLinkAboutSDP200500023 Calculations 2005-05-04 ,(4,oF AL1 fIII1�Ar )/ tetILIP' INESSEAVES vlRG1i @ 10 :3(0 COUNTY OF ALBEMARLE ********************************************************************* The following facsimile message is being sent from: Department of Community Development 401 McIntire Road,Room 227 Charlottesville, Virginia 22902-4596 Phone: (434)296-5832 Fax: (434)972-4126 Date: 04 May 2005 Number of Pages(including cover): 9 Sent To: Mr.Brian P. Smith PE Fax: 434.296.2041 Bnan P. Smith Engineenng Phone: 434.296.3644 Sender: Allan Schuck RE: Subway-DQ computations for pipes Division: Community Development,Engineering Review Message: Mr. Smith PE: Enclosed are the computations, done by Roudabush, Gale&Associates,Inc., for the pipe system leading to the Gateway Pond. Please call me at 434.296.5832, Ext. 3069 with any comments or questions. Thanks, Allan Schuck Attachments: 26 July 1991,Documentation from Roudabush, Gale&Associates,Inc. Copy: file WPO-2005-00022 File:05-04-05,Subway-DQ Comps I I 1 1 It .. �P�.a -�. �'�1'F3#�°�..- � Hit z s..r.. t 338 R_ o Road Charlottes('1. 1. le,. Vi4 .22901 ----- 7-19Cr3- BO -78--i 8 9 July 12, 19e31 , J� '• . • ''y" IJ ,n i • J-. `�r.4 f Department of Engineering Albema rle Count y t R`... 40t i'3t__. tiro Road / t 1 Charlottesville, Virginia 2 901 ��� �` r Re Forest Lakes Dear Charlie: Forest Lakes is working out an agreement :,with Holly Memorial Gardens to use the cemetery's pond to attenuate the ten-year storm to gre-development levels and thereby eby satisfy the requirements of the Str'rmw='Iter} Detention Ordinance. AttachmeAttachment }A shows the drainage area and attachment B shows the pre and pf_.i-t development 0's. Currently the pond has a 6" diameter riser/discharge pipe and an emergency spillway. The attached plans show how we propose to install a new discharge e structure. Attachments C,D and E are the routings through the proposed structure. As you can see the ten- year peat: is considerably. Finally, attachments E and i= are the design calc= for the proposed new channel downstream of the pond. Please let me know if you need any additional information. Sincerely, W. Thomas *iuncaster, Jr.. P.E. r , (Aut Ifk mob, L ae,r hr tsit; Rational Formula AreaNumber ;'f f t=a C. Area (.a C i CA 1 0. 300 65. 000 20. 700 -------- Weighted Totals: 0. 300 6`'. 000 20. 700 Time of concentrati000n= 25 min ----- Period Intenssity Peak Flow (years) (i n:h r ) (: f s) 2. 50 51 . 75 5 3. 1{) 64. 17 10 " _= - J. J ,.,%-t / . 8 -,= 4. 22 - - _ 50 4. 66 96.46 100 5. 20 107.64 Rational Formula Area Number i_ Area (a'_ ) CA 2 0. 750 9. 53E 7. 152 Weighted Totals: 0. 418 69. 062 28.860 Time of concentration= 25 min Period Intensity Peak Flow (years) (:in/hr) ( fs) , 2 2. 50 72. 15 5 3. 10 99. 47 1 it) ._J. JJ 102. 45 i5 4. 22 121. 79 -- 50 4. 66 134.49 100 5. 20 150. 07 • i('•r**?:•* *•*J:***}:'. lg%_!. **1-*T******.•**T,**** -X*-.. . ***************************- * ROUT VERSION 5. 4 ** PROJE?..T: FL EQMH 108T C::: ** DATE: 6/25/ 1'9'91• = ;1*** 3c;'y.*_.c***ti _3._z:•3_*_s f*r:•=s** "':i**y._y.* +: }:•:* }°:y ****r.i X a•Xz''-:•if••*•A-**s•*if•'y •1.. _*r f*r:, :Types: l : Weir ; 2: Pipe; 3: Riser ) Structure 1 Structure 2 1: Type 3: Riser 1 : Weir Weir : Elevation ( ft) 0. 00 476.00 3: Length ( ft ) 0.00 10.00 4: Coefficient 0.00 3.33 Riser : 5: Elevation (ft) 474.60 0.00 6: Inlet Area (sf) 11. 45 0. 00 7: Inlet Perimeter ( ft ) 15. 70 0. 00 8: Orifice Elevation ( ft ) 0. 00 0. 00 9: Orifice Diameter (in) 0. 00 0. 00 10: Orifice Elevation ( ft ) 0. 00 0. 00 11 : Orifice Diameter (in) 0. 00 0.00 12: Orifice Elevation ( ft ) 0. 0(i _ 0. 00 13: Orifice Diameter (in) 0. 00 0.00 Pipe: 14: Invert Elevation ( ft ) 46'9. 60 0. 00 15: Diameter (in) 36. 00 0.00 16: Orifice Diameter (in) 36. 00 0. 00 17: !_ength ( ft) 125. 00 0.00 18: Manni ng' s n 0. 013 0. 000 19: Slope ( ft/ft ) 0. 010 0. 000 20: Entrance Loss Coefficient 0. 5 0. 0 Surface: 21 : Initial Elevation ( }t ) 474. 60 Storage Pond Characteristics: Section Elevation Area ( ft) (ac 1 464.01 0. 00 (Calculated) 2 474. 60 1 . 74 3 476.00 1 .97 4 478. 00 '.30 Control : RW = Riser acting as a weir RO = Riser acting as an orifice PI = Horizontal pipe in inlet control PO = Horizontal pipe in outlet control Time Inflow Riser Weir Total Elev Storage (min) (cfs) (cfs) (cfs) (cfs) (ft ) (ac-ft ) 0.0 0. 00 0. 0 0. 0 0.00 474.60 0.00 5.0 14.45 0.2 RW 0.0 0.21 474.62 0.04 10.0 28. 8'9 1 .6 RW 0. 0 1. 62 474.70 0. 17 15.0 43.34 5.3 RW 0.0 5.27 474. 82 0. 38 20. 0 57. 78 11 .8 RW 0. 0 11 .77 474. 97 0.66 25. 0 72. 23 21 .3 RW 0. 0 21 .28 475. 15 0.98 30. 0 63. 58 30.9 RW 0. 0 30. 94 475. 30 1 . 27 35.0 54. 93 37. 3 RW 0. 0 37. 32 475. 40 a . 44 40. 0 46. 2e 40. 4 RW 0. 0 40. 4;-1.. 475. 44 1 . 52 45. 0 37. 63 40.8 RW 0. 0 40.81 475. 45 1 .53 50. 0 28. 98 38. 9 RW 0. 0 38. 54 475. 42 1 . 49 55. 0 20. 33 35. 4 RN 0. 0 35. 44 475. 37 1 . 35 R 6(:?. �:? 11 . 63 30. 8 W 0. 0 30. 85 475. 30 1 . 26 65. 0 ..]. �_�._ 25. 6 RN 0, 0 25. 55 475. 22 L : 1 i ***:f**•R-*:***r.**-,h,* .p.*'`.f•r'fi•h'.****#x'f.•**-•?+.-#*s,,.-.y._._s. s-#*t• t•#:**x-#F#:':-t****Y- :**;;.*****x-*?• ROUT VERSION 5. 4 ** PROJECT: FL 6OMH 108T 010 ** DATE: 6%25i 199 1* *•*•*•*•i'**'***•*xF-*•h;4*** =f**_y***.z*._y._i-**p**.X-`f,-=+i,** .;i.. ._y_t ***,*_{.* *•*.*._{.**f_#.r •.. -r. ..' *•*•;r (Types: 1 : Weir ; 2: Pipe; 3: Riser ) Structure 1 Structure 2 1 : Type 3: Riser 1 : Weir Weir : 2: Elevation ( ft) 0. 00 476. 00 3: Length ( ft ) 0. 00 10.00 4: Coefficient 0. 00 3. 33 Riser: 5: Elevation ( ft) 474. 60 0. 00 6: In1et Area (sf) 11 . 45 0. 00 7: In.let Perimeter ( ft ) 15. 70 0. 00 8: Orifice Elevation ( ft ) 0. 00 0. 00 9: Orifice Diameter (in) 0. 00 0.00 10: Orifice Elevation ( ft ) 0. 00 0. 00 11 : Orifice Diameter (in) 0. 00 0.00 12: Orifice Elevation ( ft ) 0. 00 0. 00 13: Orifice Diameter (in) 0. 00 0. 00 Pipe: 14: Invert El evation ( ft ) 46(4. 60 0. 00 15: Diameter (in) 36. 00 C). 00 16: Orifice Diameter (in) 36. 00 0. 00 17: Length (ft ) 125. 00 0.00 18: Manni ng' s n 0. 013 0. 000 19: Slope ( ft/ ft) 0. 010 0. 000 20: Entrance Loss Coefficient 0. 5 0. 0 Surface: 21 : Initia.l Elevation ( ft ) 474. 60 Storage Pond Characteristics: Section Elevation Area ( ft) (ac) 1 464.01 0.00 (Calculated) 2 474.60 1 . 74 3 476.00 1 .97 4 478. 00 2.30 Control : RW = Riser acting as aweir RO = Riser acting as an orifice PI = Horizontal pipe in inlet control PC = Horizontal pipe in outlet control Time Inflow Riser Weir Total Elev Storage (min) (cfs) (cfs) (cfs) (cfs) ( ft ) (ac-ft) 0. 0 0. 00 0. 0 0.0 0. 00 474. 60 0.00 5. 0 20.51 0. 3 RW 0.0 0.35 474.64 0.06 10. 0 41 . 02 2. 7 RW 0. 0 2. 74 474.74 0.-25 15. 0 61 . 54 9. 3 RW 0. 0 9. 27 474.92 0.56 -0. s 0 82. 05 20. 0 RW 0. 0 0 19. 97 475. 13 0.94 25. 0 102. 56 35. 2 RW 0. 0 35. 20 475. 37 1 .39 30. 0 90. 28 49. 8 RO 0. 0 49. 80 475. 57 1 . 77 35. 0 77. 99 52. 6 RO 0. 0 52. 60 475. 68 1 . 98 40. 0 65. 71 54. 1 RO 0. 0 54, 09 475. 74 ,_. 10 45. 0 53. 43 54. .E RO 0. 0 54. 53 475. 76 6 2. 14 50. 0 41 . 15 53. 9 RO 0. 0 53. 95 475. 74 '7, 09 55. 0 28. 86 52. 4 RO 0. 0 52. 40 475. 67 1 .96 60. 0 16. 58 49. 9 PD 0. 0 49. 86 475. 57 1 . 77 65. 0 4. 30 40. 0 RW 0. 0 40. 02 475. 44 4 1 . 51 **•3f****.Is *************y{.*-f***************Z-3.-!*** +Y..i Y*-f******. #**-.`i*****.****** . * ROUT VERSION 5. 4 ** PROJECT: FL 6OMH 108T 0100 ** DATE: 6/21/1991* **;#•-`i.}* •?3•#•* •* `-r§.** •-r.•* cif +5*_*t s.-f-'r.• *** : * r *•3-*_i . .7 •_f•* r= =t- ** • ** s-'*** r* • (Types: 1 : Wei r ; 2: Pipe; 3: :i se'r ) Structure 1 Structure 2 1 : Type 3: Riser 1 : Weir Weir : 2: Elevation ( ft ) 0. 00 476. 00 3: Length (ft ) 0.00 10.00 4: Coefficient 0. 00 ^ 33 �.7. ,JJ Riser : 5: Elevation ( ft ) 474.60 0.00 6: Inlet Area (sf) 11 . 45 0.00 7: Inlet Perimeter ( ft ) 15. 70 0. 00 8: Orifice Elevation ( ft ) 0. 00 0. 00 9: Orifice Diameter (in) 0. 00 0.0E0 10: Orifice Elevation ( ft ) 0. 00 0.00 11 : Orifice Diameter (in) 0. 00 0.00 12: Orifice Elevation ( ft ) 0. 00 0. 00 13: Orifice Diameter (in) 0. 00 0.00 Pipe: 14: Invert Elevation ( ft) 469. 60 0. 00 15: Diameter (in) 36. 00 0. 00 16: Orifice Diameter (in) 36. 00 0. 00 17: Length ( ft ) 125. 00 0.00 18: Manni nq's n 0. 013 0. 000 19: Slope ( ft./ft ) 0. 010 0.000 • 20: Entrance Loss Coefficient 0. 5 0.0 Surface: 21 : Initial Elevation ( ft ) 474. 60 Storage Pond Characteristics: Section Elevation Area ( ft) (a c ) 1 464. 01 0.00 (Calculated) 2 474. 60 1 . 74 3 476. 00 1 . 97 4 478. i 1c_1 2.30 Control : RW = Riser acting as a weir RO = Riser acting as an orifice PI = Horizontal pipe in inlet control PO = Horizontal pipe in outlet control Time Inflow Riser Weir Total Elev Storage (min) (cfs) (cfs) (cfs) Ccfs:1 ( ft ) (ai_-ft ) 0. 0 0. 00 0. 0 0. 0 0. 00 474. 60 0.00 5. 0 30.05 0. 6 RW 0.0 0.62 474.65 0.09 10. 0 60. 09 5. 3 RW 0. 0 5.26 474. 62 0.38 15. 0 90. 14 14 16. 0 RW 0.0 15.96 475. 05 0.81 20. 0 120. 1e 34. 1 RW 0. 0 i 1 34. 14 475. 35 1 . 36 25. 0 150. 23 52. 7 RO 0.0 52. 70 475. 69 1 .99 30. 0 132. 24 59. 6 6 0. 0 59. 57 475. 99 i 57 35. 0 114. 25 63. '3 RD 2. 9 66. 80 476. 20 2.99 40. 0 i 1 96. 25 66. 2 PO 5. 8 71 . 99 476. 31 3. 2.� 45. r 1 78. .26 67. 0 RD 7. 1 74. 18 476. 36 3.31 50. 0 60. 27 66. 7 PO 73. 39 476. 34 3. 28 55 - 42. 28 3 RD 60. 0 1 24. 29 62. •3 F'n 1. . '3 64. 76 476. 15 2. 89 _ . . _ _ 1,-c-. .z.-. .. _ Fofz_,s -r ._c_kk_,E,--s. 1-0C-ArL- 0,3 S ..-4;8_3_.____. '',0"6 . _ _ _ _ _._ 333 - 1 I - 0,1 3.5_'/_ 1.0 a 11 _ _ _ .tzt•B . ___ ."- - _ _ .. -i.- LI 1 _ 5-,:•• cr....7...:5 ---- - ,. (3.-..). C, '=) -f- r: - - --.., __. . cs.: .. . .._ __ .-- . 0 /• - - ,-4,...:0 4 . - - --- - R. 1 P PA-T:' ;-(,-) .-- . . 0,i ---2-- c • P. CF.. 4._=_._1.:f..g. l_ -..- ) 0 7- S . - ___ _._ . .. ._ \ O 0 7 RA t 6-)M-e-- A.'Nov ti L C 2- - _.-7 5° I --t-- i 1 Via. — ; 4 . ! i -.---_•?...4". F....! 6._. 8 4, KA_ -2 0 .e 2.S. ---+- -T--, il usLz- (24P PR-0 Lit-i 8 .,I li _ . - il ,_•..; ..- ..- • - - - • ... Trapezoidal Channel Left Side Slope: 2. 00: 1 (Horizontal /Vertical ) Right Side Slope: 2. 00: 1 (Horizontal /Vertical ) Bottom Width: 4. 000 ft. Uni form Flow: Normal Critical a-) Slope ( ft/ft ) : 0. 0250 0.0186 Flow (cfs) : 80. 00 Velocity ( ft/sec ) : 6. 8867 6. 1718 Length ( ft ) : 0. 00 Depth ( ft ) : 1.-. 6 93 1 . 7352 Travel Depth (in) : 19. 3112 20. 8220 (min) : 0. 00 Manning' s n: 0. 0350 Hydraulic_ Radius: 1 . 0375 Wetted Area (sq ft ) : 11 . 6166 Wetted Perimeter ( ft ) : 11 . 1969 Hit any key to change parameter . Top Width ( ft ) : 10. 4371 Return goes to menu: Trapezoidal Channel Left Side Slope: 2. 00: 1 (Horizontal /Vertical ) Right Side Slope: 2. 00: 1 (Horizontal /Vertical ) Bottom Width: 4. 000 ft . Uni form Flow: Normal Critical 'C IOv) Slope ( ft/ft ) : O. c:) 5O 0. 0178 Flow (cfs) : 110. 00 Velocity (ft/sec) : 7. 4922 - 6. 6134 Length ( ft ) : 0.00 Depth ( ft) : 1 . 8881 2. 0513 Travel time (sec ) : 0. 00 Depth (in) : 22. 6569 24. 6151. (min) : 0. 00 Mann i ng' s n: 0. 0350 Hydraulic Radius: 1 . 1799 Wetted Area (sq ft ) : 14. 6820 Wetted Perimeter ( ft ) : 1:2. 4437- Hi t any key to change parameter . -1 t Top Width� �i t. tt ) : 11 . 5523 Return goes to menu: \\ § ,.) 1 II • Le ....----<- \:.......v\..\\H". . , \\ . I/ 0 - \\ ... - ,, .. NN AT-7;404A EL)T A IN\ -----__ C --\ -. -- • \\ › .-,..:11..._ \\ \ \ ,,- s.0c4 I • . \ ...."-------1 L.____-- ----__ ______.„---- , _ ._ ... _ .•. - _ ._____ . • . .. • \ N ....,,,.,-, _ -_-___-_---- s--:-x_- ___ . . \\ \ _ N, _.. _ . ,.-- , .. / , , N.._ , . , • • i . - - ... ...- •\ - \ . '. 1 • '.1.11 t \: . . 1 ' . , ..... - .- • 4 :-:.), -. 't . , ,-- .--•' : \\ \\ . \.i .. • �� * 1., 1� 1. 5�� • 1 OS\\ \ k' .1 \', ., El a . ' 1/4,\\ . ‘ may '.,- . C .- . , ., ._ '`. , \ . IP, / ---..-... - , . , s-- --:-- .- \ j C \ '- - , , - • Cli) -- . .• -- . \ . \\\ i \ ', ,. ‘. , . , , ) \ 1 11 � 11 • � , -'-----,,,,_, 3.ebt....ep,,,,- \ , ;. J IA ( � cam— -j / j t _.% • -. 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