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HomeMy WebLinkAboutWPO202200027 Calculations 2022-12-20TOWNEPLACE INN AND SUITES COUNTY OF ALBEMARLE, VIRGINIA DESIGN CALCULATIONS & NARRATIVE REF. WP02022-00027 JULY 79 2022 REVISED: 12/12/2022 TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. Prepared by: Bryan Cichocki, PE Timmons Group 608 Preston Ave, Suite 200 Charlottesville, VA 22903 434.327.5380 Bryan D. Cichocld lic. No. 53741 �2/iz/zz F::7r Table of Contents Section Title Project Narrative 2 LD 229 — Storm Sewer Design Computations 3-4 LD 204 — Storm Inlet Design Computations 5 LD 347 — Hydraulic Grade Line Computations 6 Riprap Calculations Project Narrative: This project includes the construction of a Towneplace Inn and Suites hotel, surface parking lot, and associated landscaping, utilities, and drainage facilities. The limits of disturbance due to clearing and grading totals 2.30 acres. Stormwater Management: In the existing condition, the property is undeveloped. However, per record plan "W 0200600075" and "Amendment of Phase II Road Plan for Olympia Drive & Town & Country Lane", a bioretention was designed to meet both stormwater quality and quantity requirements for the future build out of the parcel. The bioretention also handles stormwater quantity and quality requirements for the Guadalajara parcel (78-913) and portions of Olympia Drive and Town & Country Lane. See Sheet C6.0 for record plan sheet reference. According to the drainage area map provided in the above -referenced record plan, a majority of the Towneplace Inn and Suites parcel was considered in a fully -developed condition for the design of the bioretention. The developed condition for the parcel included 2.13 acres with a c-factor of 0.90. The proposed limits of disturbance for the Towneplace Inn and Suites is 2.30 acres, while the overall parcel area is 2.40 acres total. Since only 2.13 acres of the parcel was accounted for originally in the design of the bioretention, calculations were performed with this plan to determine if any additional on -site stormwater management would be required for the remainder of the disturbed area. The overall parcel was also considered as the most conservative approach. These results are summarized in the table below: DRAINAGE AREA MANAGED IMPERVIOUS TOTAL TURF (AC) (AC) (AC) DA-3A (Proposed Towneplace Suites) - LOD Only 0.40 1.90 2.30 DA-3A (Proposed Towneplace Suites) - Entire Parcel 0.40 2.00 2.40 DRAINAGE AREA AREA (AC) C C*A DA-3A (Sheet R8 Storm DA Map, Amendment of Phase II Road Plan for Olympia Drive & Town & Country Lane, 2.13 0.90 1.92 WPO200700078 Amendment) DA-3A (Based on Proposed Towneplace Suites 2.30 0.80 1.83 Development) - LOD Only DA-3A (Based on Proposed Towneplace Suites 2.40 0.80 1.92 Development) - Entire Parcel Runoff from the proposed Towneplace Inn and Suites development does not increase when compared to the original assumed developed condition in either case (LOD or total parcel area). Therefore, this project is subject to grandfathering per 9VAC25-870-48. No additional stormwater management is proposed on -site for quantity or quality purposes. LD-229 PROJECT: TownepI. Inn a SuRes STORM SEWER DESIGN COMPUTATIONS COUNTY: Alternate County STORM FREQUENCY 10 UNITS ENGLISX PIPE NO FROM FOINT TO FOINT URAM, AREA 'A' A[r< (3) RUNOFF WE" "C" (4) CA TOTAL INLET TIME Mims (]) RAIN FALL IMIr (8) RUNOFF Q CPS (9) INVERTELEVATIONS UPPER ENU (10) LOWER END (ID LENGTH of Pipe R (12) SLOPE FlhL (13) SIZE FI io Or Spuv ) N. 111) SHAPE Cepaziry CFS (15) Friction Slow FLAY VEL Vn FNNm (16) FLOW TIME Min. (M REMI.RKS (19) INM-ACCUM- MENT (5) ULATEU (6) ADM CA REFERENCE (I) STA. REFERENCE (2) STA. 213 210 212 01W 0W 00. 0291 0225 6NO 62V 1813 423.1]9 4216W 70953 0020 12 NO Circular 5<57 0002 6259 02M R fDreina 211 212 210 0M0 07M 0317 0W8 0NO 62M 61n 3751 021476 621 IM 35%] 0010 15 NO C ular 69% ON3 5813 01(2 209 210 2118 0050 03W 0015 0623 0NO 63M 6143 3826 020919 620810 79M 0010 15000 C ular 69% ON3 5841 0023 207 208 2M 02M 0M 0170 0]9] 0NO 6324 606 6889 020"1 620 OM 61073 0010 15000 C ular 69% OW5 6181 0165 205 206 2N 0140 0910 0113 0910 ONO 6"9 60% 5543 019831 618710 112. HIS 0010 15000 C ular 69% 0ON 6339 0295 203 2pf STR-2A1 0210 085) 02M 1.114 ONO 67M 60N 6695 4185N 618210 198% 0015 15000 C ular 8569 0009 7742 0043 M I STR-2A1 SIFIA OIMI 089) 01(2 1216 0NO 6827 1 5997 72% 418010 41530 39711 1 OIM] 15000 Cn<ular 16683 1 0013 13.16] 0050 Ul STR-21) SIW2C 0350 0ON 0315 0315 ONO 6NO AUG 1962 028350 421950 105.186 0032 15 W0 C ular 11611 ON] 7057 0248 m STR-2C STR-2R 0OM 0ON 0063 03]8 ONO 62U 61" 2328 026850 6232W 397W 0NO 15000 C ular 12909 ON] 7992 0083 m STR-213 STR-2A 0200 0ON 0IN 0558 ONO 6331 6131 3623 022510 6154% 153336 0046 15000 C ular 13.818 ON3 93% 0273 m STR-2A STR-2 0ON 0NO 0ON 1]]< 0NO 6892 59M 10616 416]]0 108430 1985W 0032 15000 C ular 11539 0027 10696 030 U9 STR-]A 301 0200 1 08W 010 0160 0ON 6ON AUG 0N7 019656 1 4192W 79110 OWS 15000 Cncular 4SM 0ON 29M 0002 EK10 STR4 "1 0ON 0NO 0ON 0616 0No 6ON AUG 6025 021.IN 420 NO SO.313 0011 15000 C ular 6813 0ON 5795 0145 603 CF36mn TMP]RAR, tali. Wg p ian dT$C LN Hq 301 108 0OW 08W 0048 0854 0ON 6145 61R8 5285 419CW 418825 1560 0015 18000 C ular 1393< 0002 7359 0035 111 112 110 ONO 0ON 0054 0180 0126 6ON AUG 1.121 023822 4213% 1218W OOM 12000 C ular 5457 ON] 54n 0371 RWfU n2&5 109 110 108 02M 0740 0163 0343 0No 6371 6123 2M9 421.1% 420997 19328 0010 15000 C ular 69% ON] 49M 006f 107 1W 1N 0ON 0NO 0ON 1215 0018 6435 6105 2117 012862 416439 142360 0010 18000 C ular 113]] 0ON 6870 03<5 RaofUninl 105 IW IN 0OM 0810 0057 12'R 0ON 6780 6010 2612 016210 415865 32<92 0010 18000 C ul.1 113]] OW5 69M 0ON 103 IN 1 102 1 0ON 0NO 0ON 1326 0054 6871 590 29M 016030 413849 1 18060 1 0010 1 24000 C ularj 24505 1 ON] 1 6976 1 0043 R fUvn3 102 1W 02J0 08W OH4 1510 0ON 6914 5971 9018 CO291] IOT]IO 236]R 0010 24Wu C ular 22620 0W2 6807 0058 STR-5 403 00W 0850 0069 0ON 0ON 6ON AUG 0424 0113M 411230 52225 OWE IS Wu Cncular 3222 OOW 1822 0<]8 IW C01 0110 0859 0120 0188 0000 61]8 6093 1.1" C08981 108010 <B SO OOM 18 W0 Grcular LL852 0ON 4993 0162 w on 1N 0ON 0" 0ON 0188 ONObb6pf81.139 CO2N1] 07710 19N 0010 18Wu Cncular 10502 0ON 3NO 008fIW STR-2 01W 0850 0162 1.4 0000 69'R 5958 11 %9 CO2510 d06]W YJ8M 0023 24Wu Cncular M5J] 0W2 980] 0052STR-2 STR-1 0110 0. 0099 3733 1 0000 1 2186 1 5002 1 22.030 4050]0 1 0430 1905 OOM 1 2400u 1 C.1-1.1 67 SIN 1 0009 1192961 0016 1 Qufall FORM LID 204 STORMWATER INLET COMPUTATIONS SHEET 1 OF 17 LD204 Inlet Calcs PROJECT Tmneplace Inn & Suites INLETSOFT BY ENSOFTEC DATE: 12/14/2022 FORM LID 204 STORMWATER INLET COMPUTATIONS SHEET 2 OF 17 LD204 Inlet Calcs PROJECT Tmneplace Inn & Suites INLET tS FF W� f $a Inlets On 0. 174 4 0.696 0 0.0500 0.0240 1.866 2.000 10718 0.0833 3.4708 342 0 4 0 0 0-696 00500 6 0696 1196 0192 0.333 3.196 4.153 210 DI-1 1250 0.050 0.30 0.05 0.015 4 0.06 0 0 4 0 0 0060 0.0100 1250 1.25 0.060 0480 212 DI-3C I 6.000 1 0.310 0.90 I 0.279 0.130 0.30 O 039 0.318 4 1 272 0 0.0600 0.0640 2.338 2000. 0.8554 0.0833 13016 246 0 4 0 0 1272 0.0600 6 1.272 1788 0.512 0.333 3.788 2.328 214 DI-1 44.000 0.060 0.90 0.054 0.040 0.30 0.012 0.066 11 0.264 0 0.0075 0.0500 1899 2.000 10532 0.0800 16 2.72 0 4 0 0 0264 0.0075 0.750 44 0.264 1.561 0400 4281 2.602 INLETSOFT BY ENSOFTEC DATE: 12/14/2022 LD-347 PROJECT: Towenplace Inn & Suites HYDRAULIC GRADE LINE ANALYSIS INCIDENCE PROBABILITY 10 Year INLET OR JUNCTION OUTLET WATER SURFACE ELEV. DIA. PIPE De (In) DESIGN DISCH. On (CFS) LENGTH PIPE Le (Ft) FRICTION SLOPE, Sfe (FTIFT) FRICTION LOS$ Hf (FD JUNCTION LOSS FINAL H (Ft) Inlet Water S.rf oe Elevaon Rim Elev C..m Vo He (Ft) Di Vi ON V1 9 Hi Angle HA Ht 1.3 HI STR-2 405.96 24 22.03 19.1 0.95% 0.18 19.3 1.45 10.62 10.7 113.55 1.78 0.62 78.83 1.17 3.24 0 1.8 407.76 412.53 OK 4.77 STR-2A 409.43 15 10.62 198.6 2.70% 5.36 10.7 0.44 7.29 13.17 96.04 2.69 0.94 90.91 1.88 3.27 0 7 416.43 424.93 OK -8.5 STR-2A7 416.43 15 7.29 39.71 1.27% 0.51 13.17 0.67 6.69 7.74 51.83 0.93 0.33 41.99 0.4 1.4 0 1.21 417.63 421.61 OK -3.98 204 419.21 15 6.69 19.89 0.92% 0.18 7.74 0.23 5.54 6.34 35.13 0.62 0.22 20.38 0.16 0.61 0 0.49 419.7 424.25 OK 4.55 206 419.71 15 5.54 112.11 0.63% 0.7 6.34 0.16 4.89 6.18 30.22 0.59 0.21 87.76 0.42 0.78 0 1.09 420.8 427.32 OK -6.52 208 421.03 15 4.89 61.07 0.49% 0.3 6.18 0.15 3.83 5.84 22.35 0.53 0.19 6.09 0.03 0.37 0.48 0.54 421.57 427.66 OK -6.1 210 421.84 15 3.83 7.94 0.30% 0.02 5.84 0.13 3.75 5.81 21.81 0.52 0.18 0 0 0.32 0 0.18 422.02 427.15 OK -5.13 212 422.12 15 3.75 35.56 0.29% 0.1 5.81 0.13 1.81 6.26 11.35 0.61 0.21 44.18 0.26 0.61 0.79 0.5 422.62 427.81 OK -5.19 214 422.62 12 1.81 74.95 0.22% 0.17 6.26 0.15 0 0 0 0 0 0 0 0.15 0.2 0.26 422.88 428.15 OK -5.27 100 409.31 24 11.08 30.88 0.24% 0.07 9.81 0.37 9.02 6.81 61.39 0.72 0.25 31.77 0.25 0.88 0 0.51 409.82 412.63 OK -2.81 102 409.82 24 9.02 23.68 0.16% 0.04 6.81 0.18 7.93 6.98 55.35 0.76 0.26 40.6 0.32 0.77 0 0.42 410.24 420.52 OK -10.27 104 415.45 24 7.93 18.06 0.10% 0.02 6.98 0.19 7.64 6.92 52.88 0.74 0.26 89.96 0.52 0.97 0 0.5 415.95 421.75 OK -5.79 106 417.07 18 7.64 37.49 0.45% 0.17 6.92 0.19 7.42 6.87 50.98 0.73 0.26 90.5 0.51 0.96 0 0.65 417.71 421.2 OK -3.49 108 417.71 18 7.42 142.36 0.42% 0.6 6.87 0.18 5.28 7.36 38.89 0.84 0.29 31.79 0.29 0.77 0 0.99 418.7 426.46 OK -7.76 301 420.03 18 5.28 15.64 0.22% 0.03 7.36 0.21 4.03 5.8 23.33 0.52 0.18 16.17 0.1 0.49 0 0.28 420.3 425.16 OK 4.86 STR-7A 420.3 15 1 79.11 0.02% 0.02 2.98 0.03 0 0 0 0 0 0 0 0.03 0.04 0.04 420.35 425.25 OK 4.9 401 409.82 18 1.14 19.7 0.01% 0 3.9 0.06 1.15 4.99 5.73 0.39 0.14 35.37 0.17 0.36 0 0.18 410.01 413.37 OK -3.37 403 410.01 18 1.15 48.54 0.01% 0.01 4.99 0.1 0.42 1.82 0.77 0.05 0.02 49.98 0.03 0.14 0.18 0.1 410.1 415.58 OK -5.48 STR-5 412.23 15 0.42 52.23 0.00% 0 1.82 0.01 0 0 0 0 0 0 0 0.01 0.02 0.01 412.24 414.96 OK -2.72 110 1 422 1 15 1 2.1 1 19.33 0.09% 0.02 4.99 1 0.1 1 1.12 5.48 6.14 0.47 0.16 71.16 0.28 0.54 0.71 1 0.37 1 422.37 425.91 1 OK -3.54 112 422.37 12 1.12 121.8 0.08% 0.1 5.48 0.12 0 0 0 0 0 0 0 0.12 0.15 0.18 422.55 428.24 OK -5.69 STR-8 1 421.6 1 15 1 4.03 1 50.31 1 0.39% 1 0.2 1 5.8 1 0.13 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0.13 1 0 1 0.26 1421.86 1 425.59 OK -3.73 STR-213 1 416.49 1 15 3.42 1153.341 0.28% 0.43 1 9.36 1 0.34 1 2.33 7.99 1 18.6 1 0.99 0.35 1 60.84 1 0.56 1.24 1 1.62 1 1.24 1 417.73 1 428.18 OK -10.45 STR-2C 1 424.26 1 15 1 2.33 1 39.79 1 0.13% 1 0.05 1 7.99 1 0.25 1 1.96 1 7.06 1 13.85 1 0.77 1 0.27 1 51.27 1 0.39 1 0.91 1 0 1 0.5 1 424.76 1 429.87 OK -5.11 STR-213 1 425.95 1 15 1 1.96 1105.191 0.09% 1 0.1 1 7.06 1 0.19 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0.19 1 0.25 1 0.35 1 426.3 1 432.48 OK -6.18 RIPRAP 5 C. N a lk Outlet Protection Summary Outlet Discharge Pipe L. W dso d� 31Do Outfall ISO -year) Diameter ft cfs ft ft ft in ft 100 2.0 19.296 13 15 0.5 6 6 PIPE OUTLET CONDITIONS PLAN �5 dim Note: It has been confirmed (per site visit) that the existing rip rap at the storm outfall meets the minimum requirements as detailed. - b