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Home My WebLink AboutPM 12166 Phases 3, 4, and 5 Drainage Study AMENDMENT TO MASTER DRAINAGE STUDY FOR SEVEN OAKS BUSINESS PARK WEST MING SPECIFIC PLAN TO INCLUDE PM 12166 PHASES 3, 4, & 5 BOLTHOUSE PROPERTIES City of Bakersfield, California JOB NUMBER 3151B April 29, 2020 Prepared by: PORTER & ASSOCIATES, INC. Engineering and Surveying 1200 21st Street Bakersfield, CA 93301 4/29/2020 AMENDMENT TO MASTER DRAINAGE STUDY FOR SEVEN OAKS BUSINESS PARK TO INCLUDE PM 12166 PHASES 3, 4, & 5 PURPOSE The purpose of this study is to develop a detailed drainage plan that provides adequate drainage facilities for Parcel Map (PM) 12166 Phases 3, 4, and 5 located within the Seven Oaks Business Park (SOBP) east of Windermere Street. The proposed storm drain system is an extension of an existing system studied per the Amendment to Master Drainage Study for SOBP to Include VTPM 12135 dated November 12, 2014 (Study). The proposed system will tie-in to the existing 36” stub studied as Reach 33 in the VTPM 12135 Drainage Study Amendment. Hydrology and hydraulic analysis were completed for the areas and reaches associated with PM 12166 Phases 3, 4, and 5. The overall tributary area draining to the ultimate basin has not changed and the ultimate required volume remains adequate. The areas from PM 12166 Phases 3, 4, and 5 are within the tributary area studied to discharge into the 48” storm drain main in Bolthouse Drive, so the existing pipes per the approved Study are still adequately sized. The hydraulic grade line (HGL) at the junction for the 36” stub to the north across from Benchmark Court in the VTPM 12135 Drainage Study Amendment was used to begin the hydraulic calculations (see attached). CALCULATIONS The parameters outlined in the Master Study were used for the calculations in this study. The 5-year flows in the gutters were calculated to check curb overtopping. In accordance with the gutter flow chart attached with the hydrology calculations, the Q that can be carried in a gutter with a 0.20% slope and a 6” water depth is 5.3 cfs. Inlet 3 has the largest 5-year total flow of 1.17 cfs entering the inlet from two directions; therefore, the proposed 6” curb and gutter are adequate to handle the 5-year flow. The HGL at the junction for the 36” stub per the VTPM 12135 Amendment was used to start the hydraulic calculations. The HGL includes freeboard of 0.5’ at catch basins and manholes and a freeboard of 1.5’ at stubs to future parcels in accordance with City of Bakersfield Standards. All pipes will be Class III reinforced concrete pipes (RCP). A Manning’s “n” value of 0.013 was utilized per the City of Bakersfield Standards for RCP. The catch basins were sized by using the City Type “A” Catch Basin parameters to solve the nomograph for capacity of curb opening inlets. Standard 3.5’ wide openings are adequate for all catch basins. The ultimate basin from the Master Study has been partially constructed to contain the runoff from the existing portion of the Seven Oaks Business Park that has been constructed. The basin will need to be expanded to at least 84% ultimate capacity incorporate the runoff from PM 12166 Phases 3, 4, and 5. As construction of the Seven Oaks Business Park continues, the ultimate basin will continue to be expanded until it is at full design capacity. CONCLUSION The proposed storm drain system will carry runoff from the site to a previously studied 48” main that discharges into the existing drainage basin previously designed in the Master Drainage Study. This study shows that adequate drainage facilities can be provided for this portion of the SOBP in accordance with City of Bakersfield standards. AMENDMENT TO MASTER DRAINAGE STUDY FOR SEVEN OAKS BUSINESS PARK TO INCLUDE PM 12166 PHASE 3 HYDROLOGY CALCULATIONS Porter & Associates, Inc.Checked By: __________ Calculations By: LKR/TNB Date: __________ Date:04-29-2020 Job No. 3151B Sheet 1 of 1 i Qi i Qp Point of Acres "C" CA SCA R/G G/T T/T 5 yr 5 yr 10 yr 10 yr Friction Vp d L T/P Conc. min. min. min. in/hr cfs in/hr cfs Slope fps in ft min. Stub 1 1.75 0.90 1.58 10 4 14 1.52 2.39 0.05% 1.4 18 45.0 0 14 min. @ Junction J1 Stub 2 5.17 0.90 4.65 10 7 17 1.35 6.28 0.08% 2.0 24 10.0 0 17 min. @ i5 0.31 0.90 0.28 0 5 10 1.50 0.42 1.80 0.50 5.48 4.93 17 1.35 6.66 0.09% 2.1 24 17.7 0 17 min. @ Junction J1 J1 7.23 6.51 17 1.35 8.78 0.15% 2.8 24 120.3 1 18 min. @ Junction J2 J2 7.23 0.90 6.51 18 1.31 8.78 0.15% 2.8 24 90.0 1 19 min. @ Junction J3 i1 0.49 0.90 0.44 0 5 10 1.50 0.66 1.80 0.79 0.01% 0.4 18 27.7 0 10 min. @ Junction J3 i2 0.28 0.90 0.25 0 5 10 1.50 0.38 1.80 0.45 0.00% 0.3 18 17.7 0 10 min. @ Junction J3 J3 8.00 7.20 19 1.27 9.14 0.16% 2.9 24 87.1 0 19 min. @ Junction J4 Stub 3 5.92 0.90 5.33 10 7 17 1.35 7.19 0.10% 2.3 24 35.2 0 17 min. @ Junction J4 J4 13.92 12.53 19 1.27 15.91 0.15% 3.2 30 114.6 1 20 min. @ Junction J5 Stub 10 1.32 0.90 1.19 10 4 14 1.52 1.81 0.03% 1.0 18 35.0 0 14 min. @ Junction J9 Stub 11 1.00 0.90 0.90 10 3 13 1.58 1.42 0.02% 0.8 18 45.0 0 13 min. @ Junction J9 J9 2.32 2.09 14 1.52 3.17 0.09% 1.8 18 145.7 1 15 min. @ Junction J10 Stub 12 1.37 0.90 1.23 10 4 14 1.52 1.87 0.03% 1.1 18 35.0 0 14 min. @ Junction J10 J10 3.69 3.32 15 1.45 4.82 0.21% 2.7 18 88.7 1 16 min. @ Junction J5 Stub 4 0.32 0.25 0.08 10 3 13 1.58 0.13 0.00% 0.1 18 35.0 0 13 min. @ Junction J5 J5 17.93 15.93 20 1.22 19.43 0.22% 4.0 30 224.0 1 21 min. @ Junction J6 Stub 5 1.16 0.90 1.04 10 3 13 1.58 1.65 0.02% 0.9 18 57.4 0 13 min. @ Junction J6 Stub 6 1.70 0.90 1.53 10 3 13 1.58 2.42 0.05% 1.4 18 23.8 0 13 min. @ Junction J6 J6 20.79 18.50 21 1.18 21.83 0.11% 3.1 36 302.6 2 23 min. @ Junction J7 Stub 7 1.62 0.90 1.46 10 4 14 1.52 2.22 0.04% 1.3 18 45.0 0 14 min. @ Junction J7 Stub 8 1.76 0.90 1.58 10 4 14 1.52 2.41 0.05% 1.4 18 35.0 0 14 min. @ Junction J7 J7 24.17 0.90 21.55 23 1.10 23.70 0.13% 3.4 36 222.1 1 24 min. @ Junction J8 Stub 9 1.69 0.90 1.52 10 4 14 1.52 2.31 0.05% 1.3 18 16.8 0 14 min. @ i3 0.87 0.90 0.78 0 8 10 1.50 1.17 1.80 1.41 2.56 2.30 14 1.52 3.50 0.11% 2.0 18 27.7 0 14 min. @ Junction J8 i4 0.62 0.90 0.56 0 8 10 1.50 0.84 1.80 1.00 0.01% 0.6 18 17.7 0 10 min. @ Junction J8 J8 27.35 24.41 24 1.06 25.87 0.15% 3.7 36 66.8 0 24 min. @ Junction* R/G = Roof to Gutter Time i = Rainfall Intensity Vp = Velocity in Pipe L = Length of Pipe Reach G/T = Total Gutter Time Qi = Inlet Flow d = Pipe Diameter T/P = Pipe Travel Time T/T = Total time Qp = Pipe Flow *Junction previously studied as J15 in The Amendment to Master Drainage Study Seven Oaks Business Park to Include VTPM 12135 dated November 12, 2014. For CB Sizing & Curb Topping i5 For CB Sizing & Curb Topping Remarks PM 12166 Phases 3, 4, & 5 Hydrology Calculations Drainage Area Time of Concentration Pipeline i3 Porter & Associates, Inc.Checked By: __________ Calculations By: LKR/TNB Date: __________ Date:04-29-2020 Job No. 3151B Sheet 1 of 1 Point of Avg Street Vg Dist. G/T Conc. Slope fps ft min. i1 0.25% 1.2 360 5 i2 0.25% 1.2 376 5 i3 0.40% 1.5 725 8 i4 0.39% 1.5 743 8 i5 0.30% 1.3 360 5 G/T = Total Gutter Time Vg = Gutter Velocity PM 12166 Phases 3, 4, & 5 Hydrology Calculations Gutter Time for Catch Basins Porter & Associates, Inc.Checked By: __________ Calculations By: LKR/TNB Date: __________ Date:04-29-2020 Job No. 3151B Sheet 1 of 1 Point of V Dist. G/T Conc. fps ft min. Stub 1 1.8 420 4 Stub 2 1.8 800 7 Stub 3 1.8 800 7 Stub 4 1.8 310 3 Stub 5 1.8 350 3 Stub 6 1.8 320 3 Stub 7 1.8 400 4 Stub 8 1.8 450 4 Stub 9 1.8 380 4 Stub 10 1.8 400 4 Stub 11 1.8 300 3 Stub 12 1.8 400 4 PM 12166 Phases 3, 4, & 5 Hydrology Calculations Gutter Time for Stubs AMENDMENT TO MASTER DRAINAGE STUDY FOR SEVEN OAKS BUSINESS PARK TO INCLUDE PM 12166 PHASES 3, 4 & 5 HYDRAULIC GRADE LINE CALCULATIONS Porter & Associates, Inc.Checked By: __________ Calculations By: LKR/TNB Date: __________ Date:04-29-2020 Job No. 3151B Sheet 1 of 1 station length diameter area Q velocity friction exit friction entrance flowline freeboard ft in sf cfs ft/sec slope loss loss loss HGL elevation Existing Junction*343.87 348.80 4.93 Reach 1 66.8 36.0 7.069 25.87 3.66 0.0015 0.21 0.10 0.04 J8 344.22 348.43 4.21 Reach 2 222.1 36.0 7.069 23.70 3.35 0.0013 0.03 0.28 0.03 J7 344.57 349.83 5.26 Reach 3 302.6 36.0 7.069 21.83 3.09 0.0011 0.03 0.32 0.03 J6 344.95 350.58 5.63 Reach 4 224.0 30.0 4.909 19.43 3.96 0.0022 0.05 0.50 0.12 J5 345.63 351.10 5.47 Reach 5 114.6 30.0 4.909 15.91 3.24 0.0015 0.16 0.17 0.03 J4 346.00 350.92 4.92 Reach 6 87.1 24.0 3.142 9.14 2.91 0.0016 0.03 0.14 0.03 J3 346.19 350.52 4.33 Reach 7 90.0 24.0 3.142 8.78 2.80 0.0015 0.02 0.14 0.02 J2 346.37 350.71 4.34 Reach 8 120.3 24.0 3.142 8.78 2.80 0.0015 0.02 0.18 0.06 J1 346.64 351.03 4.39 Reach 9 45.0 18.0 1.767 2.39 1.35 0.0005 0.03 0.02 0.01 Stub 1 346.71 351.03 4.32 J1 346.64 351.03 4.39 Reach 10 17.7 24.0 3.142 6.66 2.12 0.0009 0.07 0.02 0.03 i5 346.76 351.03 4.27 Reach 11 10.0 24.0 3.142 6.28 2.00 0.0008 0.06 0.01 0.03 Stub 2 346.86 351.03 4.17 J3 346.19 350.52 4.33 Reach 12 27.7 18.0 1.767 0.79 0.45 0.0001 0.00 0.00 0.00 i1 346.20 350.52 4.32 J3 346.19 350.52 4.33 Reach 13 17.7 18.0 1.767 0.45 0.26 0.0000 0.00 0.00 0.00 i2 346.19 350.56 4.37 J4 346.00 350.92 4.92 Reach 14 35.2 24.0 3.142 7.19 2.29 0.0010 0.08 0.04 0.04 Stub 3 346.15 350.92 4.77 J5 345.63 351.10 5.47 Reach 15 88.7 18.0 1.767 8.78 4.97 0.0070 0.38 0.62 0.08 J10 346.71 350.90 4.19 Reach 16 145.7 18.0 1.767 6.66 3.77 0.0040 0.04 0.59 0.11 J9 347.45 349.58 2.13 Reach 17 35.0 18.0 1.767 0.79 0.45 0.0001 0.00 0.00 0.00 Stub 10 347.45 349.58 2.13 J9 347.45 349.58 2.13 Reach 18 45.0 18.0 1.767 0.00 0.00 0.0000 0.00 0.00 0.00 Stub 11 347.45 349.58 2.13 J10 346.71 350.90 4.19 Reach 19 35.0 18.0 1.767 0.00 0.00 0.0000 0.00 0.00 0.00 Stub 12 346.71 350.90 4.19 J5 345.63 351.10 5.47 Reach 20 35.0 18.0 1.767 0.13 0.07 0.0000 0.00 0.00 0.00 Stub 4 345.63 351.10 5.47 J6 344.95 350.58 5.63 Reach 21 57.4 18.0 1.767 1.65 0.93 0.0002 0.01 0.01 0.01 Stub 5 344.99 350.58 5.59 J6 344.95 350.58 5.63 Reach 22 23.8 18.0 1.767 2.42 1.37 0.0005 0.03 0.01 0.01 Stub 6 345.01 350.58 5.57 J7 344.57 349.83 5.26 Reach 23 45.0 18.0 1.767 2.22 1.25 0.0004 0.02 0.02 0.01 Stub 7 344.63 349.83 5.20 J7 344.57 349.83 5.26 Reach 24 35.0 18.0 1.767 2.41 1.36 0.0005 0.03 0.02 0.01 Stub 8 344.63 349.83 5.20 J8 344.22 348.43 4.21 Reach 25 27.7 18.0 1.767 3.50 1.98 0.0011 0.06 0.03 0.03 i3 344.34 348.43 4.09 Reach 26 16.8 18.0 1.767 2.31 1.31 0.0005 0.03 0.01 0.01 Stub 9 344.39 348.43 4.04 J8 344.22 348.43 4.21 Reach 27 17.7 18.0 1.767 1.00 0.57 0.0001 0.01 0.00 0.00 i4 344.23 348.43 4.20 J = Junction Number i = Inlet Number PM 12166 Phases 3, 4, & 5 Hydraulic Grade Line Calculations *Junction previously studied as J15 in The Amendment to Master Drainage Study Seven Oaks Business Park to Include VTPM 12135 dated November 12, 2014. AMENDMENT TO MASTER DRAINAGE STUDY FOR SEVEN OAKS BUSINESS PARK TO INCLUDE PM 12166 PHASES 3, 4 & 5 CATCH BASIN SIZING CALCULATIONS Porter & Associates, Inc.Checked By: __________ Calculations By: LKR/TNB Date: __________ Date:04-29-2020 Job No. 3151B Sheet 1 of 1 Catch Basin Q - cfs Opening Required Opening Provided No. 10 - year ft. ft. 1 0.79 0.50 3.50 2 0.45 0.28 3.50 3 1.41 0.88 3.50 4 1.00 0.63 3.50 Notes: 1. Catch Basins are sized in accordance with the attached Inlet Capacity Chart for Type "A" Standard Catch Basin in a sag condition. PM 12166 Phases 3, 4, & 5 Catch Basin Sizing Table AMENDMENT TO MASTER DRAINAGE STUDY FOR SEVEN OAKS BUSINESS PARK TO INCLUDE PM 12166 PHASES 3, 4 & 5 INTERIM SUMP SIZING CALCULATION Porter & Associates, Inc.Checked By: __________ Calculations By: LKR/TNB Date: __________ Date:04-29-2020 Job No. 3151B Sheet 1 of 1 Drainage Areas*Area (Acres)C AxC Area A 25.49 0.90 22.94 Area B 15.75 0.90 14.18 Area C 14.83 0.90 13.35 Area D 9.59 0.90 8.63 Area E 12.14 0.90 10.93 Area F 6.90 0.90 6.21 Area G 1.17 0.80 0.94 Area H 0.92 0.78 0.72 Area I 2.96 0.79 2.34 Area J 3.06 0.40 1.22 Area K 4.73 0.69 3.26 Area L 1.03 0.70 0.72 Area M 0.32 0.15 0.05 Ʃ(CxA)=85.48 Design Volume (Existing + Phases 3, 4, & 5) = 0.15*Ʃ(CxA)=12.82 AC-FT Total Design Volume** Required = 15.35 AC-FT % sump to be constructed= 84% *Refer to attached Interim Basin Area Exhibit for drainage area locations. **Total Design Volume from Master Drainage Study for Seven Oaks Business Park West Ming Specific Plan PM 12166 Phases 3, 4, & 5 Interim Basin Sizing Table Po r t e r & A s s o c i a t e s , I n c . Ch e c k e d B y : _ _ _ _ _ _ _ _ _ _ Ca l c u l a t i o n s B y : L K R / T N B Date: __________ Da t e : 0 4 - 2 2 - 2 0 2 0 J o b N o . 3 1 5 1 B Sheet 1 of 1 Av e r a g e A c c u m u l a t e d A c c u m u l a t e d El e v a t i o n A r e a A r e a V o l u m e V o l u m e V o l u m e ft s q . f t . s q . f t . c u . F t . c u . f t . a c - f t 33 7 . 7 6 0 1 8 1 61 3 6 9 6 1 3 6 9 6 1 3 6 9 1 . 4 1 33 8 . 7 6 2 5 5 7 63 7 5 9 6 3 7 5 9 1 2 5 1 2 8 2 . 8 7 33 9 . 7 6 4 9 6 1 66 1 7 7 6 6 1 7 7 1 9 1 3 0 6 4 . 3 9 34 0 . 7 6 7 3 9 4 68 6 2 4 6 8 6 2 4 2 5 9 9 2 9 5 . 9 7 34 1 . 7 6 9 8 5 4 71 0 9 8 7 1 0 9 8 3 3 1 0 2 7 7 . 6 0 34 2 . 7 7 2 3 4 1 73 5 9 9 7 3 5 9 9 4 0 4 6 2 6 9 . 2 9 34 3 . 7 7 4 8 5 7 76 1 2 9 7 6 1 2 9 4 8 0 7 5 5 1 1 . 0 4 34 4 . 7 7 7 4 0 1 78 6 8 7 7 8 6 8 7 5 5 9 4 4 2 1 2 . 8 4 34 5 . 7 7 9 9 7 3 PM 1 2 1 6 6 P h a s e s 3 , 4 , & 5 I n t e r i m B a s i n V o l u m e P r o v i d e d