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HomeMy WebLinkAboutWPO201600008 Calculations WPO VSMP 2016-07-25 (2) PROJECT MANAGEMENT CIVIL ENGINEERING LAND PLANNING ENGINEERING June 24, 2016 Albemarle County Department of Community Development Regarding: Carroll Creek Road Culvert Design & Drainage Computations To Whom It May Concern, Enclosed are the calculations and details relating to culvert design for improvements on Carroll Creek Road. A 10'x10' box culvert is proposed, which passes the 10-yr storm from Carroll Creek with H/D< 1.5 and the 25-yr storm without overtopping the embankment. Based on our recent and thorough investigation, ` we believe flooding on the Rivanna River will not effect the tailwater of the peak storm in Carroll Creek. We have run this analysis in HEC-RAS and are happy to provide a digital copy upon request. If you have any questions please do not hesitate to contact me at your earliest opportunity. I may be reached at: Justin at shimp-enqineerinq.com or by phone at 434-953-6116. Or, Justin Shimp, P.E. IMO Contents: Culvert Design: FEMA Flood Profile at confluence of Carroll Creek Flow Computations from FEMA Study Rivanna River Cross-Section "G" Carroll Creek Watershed Map Carroll Creek Regression Computations HEC-RAS Tables, Sections, and Profile Road Drainage Design: Ditch Drainage Area Map Time of Concentration Calculations ,, LD-268 i ire 10/30 Page 2 of 18 031110 dNNdi110 311IAS31101JVH3 3O A113 IN3ON3d3ONI 3H1 ONV SV3HV 031tl80d800NI ONV 00 tlINI9HIA 'AINf100 31HtlW381tl o S31130Hd 0001d A3N39V IN31/139VNVW A3N3903V131d03033oz ro a O 0a) c0 O CO OO 0 a) N LN NM C) N N N 0 rn I Icri O N 1 I O p p p0 Z 1 ` �y p p p 1 I W 11 11 W F- Q 2 V U C-.) V 1 I = Q Q S p 1 I J v C=.) U Z p 1 JI J CO I a a 0 o v ai I i © z p 2 2 2 CD N N 1 U... 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C 13.2 10.6 9.51 8.68 8.04 7.70 7.47 A 5.77 BDF 3 ilMI b1 0.21 0.17 0.16 0.15 0.15 0.15 0.16 b2 -0.43 -0.39 -0.36 -0.34 -0.32 -0.32 -0.32 b3 0.73 0.77 0.79 0.80 0.81 0.82 0.83 aa UQT 540 913 1298 1770 2255 2759 4225 ..r • M 10/30 Page 7 of 18 ✓ — 0 0 0 0) 0) (0 coo 00 t U O o 0 0 0 0 0 0 (- O m CO 0 00 (a Me LL 0. ;0 N 0 CO C0O 'tO n L - Cr) N V N N (0f ) 0V (f) 4 3• E. We $ � I- 1--- co 0) 0 CO n N 0 10), CO CD CV M In N ((y co ,- co W • O' N! CNV N N- N N D U v LL W 1 N r 11) CO 0 n N N^ WS L o r r N co co 0 TS > fO v v v o coNN. 0 a 0 0 0 0 0 0 0 0)0) CD 0 0 0 o O 0 0 CO o 0 0 0 0 0 0 0 0 0 0 o 0 o 0 o Li; ow • CC N( co u C CO ai cd co a0 co 00. N. n CO CO CO W N N 0 N N (Si (Si N N d gm uJ O^ N, N CO 0V V N CO0 (00 CDN ^O (�O COc 3 N in N N N N N SW '� 0 > M CO CO N CO C O N 0 0) CO 0) CO CO N n LC) .. 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I / / I I \ \ \ \v \ \ I ( / ` \ I I I I I / l 1 / /<( 1 I \ \ I \ / / II 1 /\ / ( IIA / / / I / / V ) > > \ ` \ \ I 1 / / / I \ \ \ \�\\\� 1 \ < I r —c \ N,�(\I�\ \ ( ! I / ; �� \• I, \ \ \ — \ \\N, or Carroll Creek Road Time of Concentration Calculations SCC Carroll Creek Road North STA 13+50 +• 101 ft overland flow 10.9% slope 0.35 C-value 9.5 min Seelye Chart 712 ft paved swale 60.0 ft height 3.3 min. Kirpich Chart 12.8 min. ail SCC Carroll Creek Road North STA 15 101 ft overland flow 10.9% slope 0.35 C-value 9.5 min Seelye Chart 554 ft paved swale 39.0 ft height 2.9 min. Kirpich Chart 12.4 min. SCC Carroll Creek Road South STA 13+50 96 ft overland flow 1.0% slope 0.35 C-value 14.7 min Seelye Chart 1117 ft paved swale 93.0 ft height 4.9 min. Kirpich Chart 19.6 min. ir. 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