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HomeMy WebLinkAbout3345 Bernard Street - Residences at East Hills Drainage Study M e m o r a n d u m To: City of Bakersfield Date: April 28, 2020 File: Project No. 18-091 From: Alex Torres, PE, QSD Atlas Civil Design Subject: Hydrology and Hydraulic Calculations for Residences at East Hills – 3345 Bernard Street, Bakersfield, CA 93305 I. INTRODUCTION The purpose of this study is to provide drainage calculations in support of the grading design for the Residences at East Hills multi-family residential project in the city of Bakersfield. The Project is bound between Bernard Street to the north and Pico Ave to the south. This project proposes new multi-dwelling units with parking on the vacant 9.76-acre site. Because this projects land use increases the impervious area of the site, the “C” value will increase which will result in greater discharge. City of Bakersfield drainage design criteria requires excess volume of runoff to be retained on-site. Previous iterations of this study considered using a regional basin known as Bernard Sump, which is west of the site, to retain this excess volume, since it has capacity. However, hydraulic routing calculations recommended upgrading an undersized City catch basin, which was not an option for the City. Therefore, two proposed retention basins have been designed to retain the excess volume. As a result, all references from the City approved hydrology reports pertaining to Bernard Sump have been removed from this report. The grading design drains as much of the site as possible to the north. All on-site storm drain systems are designed to convey the 10-year storm, while the basins are deigned to retain the 100- year storm per City of Bakersfield criteria II. GENERAL INFORMATION The vacant land has a high point mid-way running east-west therefore half the project drains to the north and half to the south. There is negligible off-site flow entering the site from the property on the east. Soil within the project limit is HSG Group C, as shown in Appendix A. Precipitation data (IDF) used for on-site calculations follows NOAA Atlas 14, Volume 6, Version 2.0Atlas 12. Data is provided in Appendix A. III. ON-SITE HYDROLOGY Most of the site to drains the north as seen on Hydrology Map in Appendix B. The Rational Formula: Q = C x i x A; is used to determine Q-10 peak discharges. Per City of Bakersfield requirements, a minimum time of concentration of 10 minutes is used to determine the intensity. A “C” coefficient of 0.8 for R3 and Multi-Family Residential land use is used for developed areas and a “C” of 0.35 is used for landscape areas with Type C soil. The Hydrology Map shows Subareas A and B, and D flowing to the north while subareas C and E flow to the south. Existing flows to Bernard Street are assigned a “C” coefficient of 0.42 as shown on approved Drainage and Storm Drain Study SPR Case 06-176 from Meyer Civil Engineering prepared on December 2006. Proposed flows to the north produce a composite “C” of 0.60. Because this is greater than the existing “C” of 0.42, excess volume must be retained on-site. The required storage for the excess runoff is determined using section 2.82 of City of Bakersfield Subdivision and Engineering Manual (1989): V = 0.15 x ∑(C x A) where; V is design volume in acre-feet for 100-year, 24-hour storm in ac-ft C is the runoff coefficient A is the drainage area in acres ∑ is the sum of all C x A areas Required storage is therefore V = 0.15 x (Cprop - Cexist x A) where: Cprop ~ Composite C = 0.60 Cexist = 0.42 A = 5.87 ac (flows to the north) V = 0.15 x (0.60-0.42) x 5.87 V = 0.158 ac-ft = 6,900 cubic feet (cf) Two retention basins, one on the north and one on the east are proposed to store this excess volume. Portions of subareas A, B, and D are routed to the two basins. Section V of this report describes individual volume calculations to each basin and the storage provided. Rational Method calculations are provided in Appendix C and summarized in the table below: Outfall Area (Ac.) Q10 (cfs) Bernard St 3.22 3.04 North Basin 1.78 1.10 East basin 0.87 0.44 Pico Ave 0.60 0.45 IV. ON-SITE HYDRAULICS On-Site hydraulic calculations for storm drains and ditches are provided in Appendix D. Project conditions from the City require all on-site storm drains be sized to convey the 10-year storm no more than half-full. Normal Depth calculations using Manning’s Formula were performed using Flowmaster by Bentley Software. These storm drains range in diameters from 6 inches to 15 inches and are plastic pipe. A Manning’s “n” of 0.011 is used for plastic pipe. The Storm ID’s used are consistent with the Storm Drain Table on sheets 6 and 7 of the Grading Plan. Storm drains not included in the calculations intercept flows from yard drains with small catchment areas. These small areas are part of the main subareas shown on Hydrology Map in Appendix B, so the flows are included on storm drain lines downstream of these small catchments. Ditch calculations are also included to show a 1-foot deep by 1-foot wide concrete v-ditch can convey all flows. A Manning’s “n” of 0.013 is used for concrete. Note: though all concrete v- ditches meet capacity requirements at 1-foot wide, many are shown larger on grading plans by request of the City. V. RETENTION BASIN ANALYSIS The following tables show the volume draining to each basin. The first table is for the north basin and corresponds with the subareas shown in Appendix C; Hydrology Calculations labeled, “Total to North Basin” and “Total to East Basin”. Volume to North Basin Area (ac) C C x A Volume (cu-ft) 0.15 1.3 0.35 0.07 2,973.0 0.15 0.48 0.8 0.06 2,509.1 Total 0.13 5,482.0 Volume to East Basin Area (ac) C C x A Volume (cu-ft) 0.15 0.87 0.35 0.05 1,989.6 Total 0.05 1,989.6 A total of 7,471.6 cf is routed to the basins. This exceeds the minimum required storage of 6,900 cf as calculated in Section III. The following Stage-Storage tables were developed from proposed surface modeling to show the basins have enough capacity to store the volume routed to them: The North Basin meets storage requirements (6,566.3 cf > 5,482 cf). The East Basins have a total capacity of 4,341 cf. This also meets storage requirements (4,341 cf > 1,989.6 cf). VI. PICO AVENUE HYDROLOGY AND HYDRAULICS On-site and off-site flows discharging onto Pico Ave are shown on the Hydrology Calculations table in Appendix C. 0.35 cfs from 0.60 acres discharges onto Pico Ave. Off-site calculations are also included to perform hydraulic calculations on the existing curb & gutter to see if spread and depth of flow are maintained within the shoulder and top of curb. They are identified as Watershed E on the Hydraulic Exhibit in Appendix B and the hydrology calculations. Hydraulic calculations in Appendix E show all criteria is met. APPENDICES Appendix A: Soil Map and Rainfall Data Appendix B. Hydrology Map and Hydraulic Exhibit Appendix C: Hydrology Calculations Appendix D: On-Site Hydraulic Calculations Appendix E: Pico Ave Hydraulics Locations Appendix A. Soil Map and Rainfall Data Appendix B. 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Civil Engineering Site Optimization DesignCivilCivilDesign R E S I D E N C E S A T E A S T H I L L S GUTTER CALCULATION LOCATIONS ( I N F E E T ) G R A P H I C S C A L E 0 4 0 1 " = 2 0 ' 0 2 0 2 0 2 FDC FDC F D C F D C FDCFDC W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W WW W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W EE EE E E E E E E E E E E E E E E EE E E E E E E E E E E E E E E E E E E E E E E E EE E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E EE E E E E E E E E E E E E E E E E E E E E E E E EE E E E E E E E E E E E E E E E E E E E E E E E E E E E EE EE P I C O A V E N U E W W W W W W W W W W W W WW W W WWW EE EE E EE EEE E EE E E E E E EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE E E E E E E E E E E E S S S S S SSS S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S SS S S S S S S S S S S S S S S S S S S S S S S S S S S SS SSSS S S S S S A1 B 1 SITE SECTIONS 3 3 BYREVISIONSDATE S H E E T O F CivilDesign.comwww. Civil Engineering Site Optimization DesignCivilCivilDesign 2191 El Camino Real, Suite 208K Oceanside, CA 92054 Tel: 1-619-307-2749 PORTION OF SECTION 22, TOWNSHIP 29 SOUTH RANGE 28 EAST PORTION OF PARCEL A OF LOT LINE ADJUSTMENT NO. 12-0439 RESIDENCES AT EAST HILLS DRAINAGE STUDY X-SECTIONS S E C T I O N A - A N O T T O S C A L E SECTIO N B - B NOT TO S C A L E ( I N F E E T ) G R A P H I C S C A L E 0 1 0 0 1 " = 5 0 ' 0 5 0 5 0 Appendix C. Hydrology Calculations Su b a r e a Ar e a DE V ( A c . ) A r e a PE R V I O U S ( A c . ) A r e a TO T A L ( A c . ) So i l T y p e C PE R V I O U S C DE V C CO M P T c ( m i n ) S U B A R E A T c ( m i n ) - T O T A L i 10 ( i n . h r ) Q 10 (cfs) Q 10 (cfs) -Total A1 0. 2 1 0 0. 2 1 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.22 0.22 A3 0. 1 3 0 0. 1 3 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.14 0.36 A4 0. 3 6 0 0. 3 6 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.38 0.74 A6 0. 1 2 0 0. 1 2 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.13 0.87 A7 0. 1 2 0 0. 1 2 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.13 1.00 A9 0. 1 1 0 0. 1 1 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.12 1.12 A1 0 0. 1 0 0. 1 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.11 1.22 A1 1 0. 3 7 0 0. 3 7 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.39 1.62 A1 3 0. 0 8 0 0. 0 8 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.09 1.70 A1 5 0. 2 7 0 0. 2 7 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.29 1.99 A1 9 0. 2 0 0. 2 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.21 2.20 A2 0 0. 0 7 0 0. 0 7 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.07 2.28 A2 1 No t U s e d Re m o v e d 0 C 0 0 0 0 0 0 0.00 2.28 A2 3 0. 4 9 0 0. 4 9 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.52 2.80 A2 4 0. 2 0 0 0. 2 0 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.21 3.01 D2 0. 0 0 0. 3 9 0. 3 9 C 0. 3 5 0. 8 0. 3 5 1. 9 7 11 . 9 7 1. 2 3 0.17 3.18 To t a l t o B e r n a r d S t 3. 2 2 3.18 B1 0 0. 2 4 0. 2 4 C 0. 3 5 0. 8 0. 3 5 10 10 1. 3 3 0.11 0.11 B2 0. 0 0 0. 3 5 0. 3 5 C 0. 3 5 0. 8 0. 3 5 2. 5 12 . 5 1. 2 0.15 0.26 B3 0 0. 7 1 0. 7 1 C 0. 3 5 0. 8 0. 3 5 10 10 1. 3 3 0.33 0.59 A2 0. 0 3 0 0. 0 3 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.03 0.62 A5 0. 0 7 0 0. 0 7 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.07 0.70 A8 0. 0 5 0 0. 0 5 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.05 0.75 A1 2 0. 0 5 0 0. 0 5 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.05 0.80 A1 4 0. 0 4 0 0. 0 4 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.04 0.84 A1 6 0. 0 6 0 0. 0 6 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.06 0.91 A1 7 0. 0 6 0 0. 0 6 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.06 0.97 A1 8 0. 0 5 0 0. 0 5 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.05 1.03 A2 2 0. 0 7 0 0. 0 7 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.07 1.10 To t a l t o N o r t h B a s i n 0. 4 8 1. 3 1. 7 8 1.10 D1 0 0. 8 7 0. 8 7 C 0. 3 5 0. 8 0. 3 5 10 10 1. 3 3 0.40 0.40 To t a l t o E a s t B a s i n 0 0. 8 7 0. 8 7 0.40 C1 0 0. 0 9 0. 0 9 C 0. 3 5 0. 8 0. 3 5 10 10 1. 3 3 0.04 0.04 C2 0. 1 2 0 0. 1 2 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.13 0.17 C3 0 0. 3 9 0. 3 9 C 0. 3 5 0. 8 0. 3 5 10 10 1. 3 3 0.18 0.35 To t a l t o P i c o A v e 0. 6 0 0.35 E1 0 1. 2 3 1. 2 3 C 0. 3 5 0. 8 0. 3 5 10 10 1. 3 3 0.57 0.57 E2 0. 1 3 0 0. 1 3 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.14 0.71 C1 t o C 2 ( P i c o O n - S i t e ) N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A 0.27 0.98 E3 0. 1 7 0 0. 1 7 C 0. 3 5 0. 8 0. 8 10 10 1. 3 3 0.18 1.16 C3 ( P i c o O n - S i t e ) N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A N/ A 0.18 1.34 E4 0 0. 0 2 0. 0 2 C 0. 3 5 0. 8 0. 3 5 10 10 1. 3 3 0.01 1.35 E5 0 0. 0 2 0. 0 2 C 0. 3 5 0. 8 0. 3 5 10 10 1. 3 3 0.01 1.36 To t a l P i c o O f f - S i t e 2. 1 7 1.36 Ra t i o n a l C a l c u l a t i o n s - Q 10 No r t h B a s i n Ea s t B a s i n Pi c o A v e O n - S i t e Pic o A v e O f f - S i t e Be r n a r d S t r e e t ( T h r o u g h D r i v e w a y ) Appendix D. On-Site Hydraulic Calculations La b e l So l v e F o r Fr i c t i o n M e t h o d Ro u g h n e s s C o e f f i c i e n t Ch a n n e l S l o p e (f t / f t ) Di s c h a r g e (f t ³ / s ) Di a m e t e r (i n ) No r m a l D e p t h (i n ) Fl o w A r e a (f t ² ) We t t e d P e r i m e t e r (f t ) Hy d r a u l i c R a d i u s (i n ) To p W i d t h (f t ) Cr i t i c a l D e p t h (f t ) Percent Full (%)Critical Slope (ft/ft)Velocity (ft/s)Specific Energy (ft)Froude Number Flow Type 1 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 0 5 0 0 0 . 2 2 6 . 0 0 2 . 8 9 0 . 0 9 0 . 7 7 1 . 4 6 0 . 5 0 0 . 2 4 4 8 . 2 0 . 0 0540 2.35 0.33 0.96 SubCritical 2 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 6 5 0 0 0 . 1 4 6 . 0 0 1 . 1 7 0 . 0 3 0 . 4 6 0 . 7 1 0 . 4 0 0 . 1 9 1 9 . 5 0 . 0 0512 5.19 0.52 3.51 SuperCritical 3 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 4 0 0 0 0 . 1 4 6 . 0 0 1 . 3 2 0 . 0 3 0 . 4 9 0 . 7 9 0 . 4 1 0 . 1 9 2 1 . 9 0 . 0 0512 4.39 0.41 2.79 SuperCritical 4 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 0 5 0 0 0 . 7 4 8 . 0 0 5 . 0 9 0 . 2 3 1 . 2 3 2 . 2 8 0 . 6 4 0 . 4 1 6 3 . 6 0 . 0 0567 3.16 0.58 0.92 SubCritical 11 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 5 0 0 0 0 . 2 6 6 . 0 0 1 . 7 0 0 . 0 5 0 . 5 6 0 . 9 8 0 . 4 5 0 . 2 6 2 8 . 3 0 . 0 0560 5.68 0.64 3.14 SuperCritical 7 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 5 0 0 0 0 . 2 6 6 . 0 0 1 . 7 0 0 . 0 5 0 . 5 6 0 . 9 8 0 . 4 5 0 . 2 6 2 8 . 3 0 . 0 0560 5.68 0.64 3.14 SuperCritical 22 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 1 0 0 0 0 . 1 2 6 . 0 0 1 . 7 3 0 . 0 5 0 . 5 7 0 . 9 9 0 . 4 5 0 . 1 7 2 8 . 8 0 . 0 0508 2 . 5 7 0 . 2 5 1 . 4 1 S u p e r C r i t i c a l 18 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 6 4 0 0 0 . 2 3 6 . 0 0 1 . 5 0 0 . 0 4 0 . 5 2 0 . 8 8 0 . 4 3 0 . 2 4 2 5 . 0 0 . 0 0545 5 . 9 8 0 . 6 8 3 . 5 4 S u p e r C r i t i c a l 20 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 1 0 0 0 0 0 . 2 3 6 . 0 0 1 . 3 4 0 . 0 3 0 . 4 9 0 . 8 0 0 . 4 2 0 . 2 4 2 2 . 4 0 . 0 0545 7 . 0 1 0 . 8 8 4 . 4 0 S u p e r C r i t i c a l 54 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 6 1 0 0 0 . 2 6 6 . 0 0 1 . 6 2 0 . 0 4 0 . 5 5 0 . 9 4 0 . 4 4 0 . 2 6 2 7 . 0 0 . 0 0560 6 . 0 9 0 . 7 1 3 . 4 6 S u p e r C r i t i c a l 16 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 0 5 0 0 1 . 0 0 1 2 . 0 0 4 . 7 9 0 . 2 9 1 . 3 7 2 . 5 7 0 . 9 8 0 . 4 2 3 9 . 9 0 . 00416 3 . 4 2 0 . 5 8 1 . 1 0 S u p e r C r i t i c a l 70 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 1 0 0 0 0 . 0 3 6 . 0 0 0 . 8 7 0 . 0 2 0 . 3 9 0 . 5 4 0 . 3 5 0 . 0 8 1 4 . 5 0 . 0 0532 1 . 7 0 0 . 1 2 1 . 3 4 S u p e r C r i t i c a l 15 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 2 1 9 0 0 0 . 1 0 6 . 0 0 0 . 7 4 0 . 0 1 0 . 3 6 0 . 4 6 0 . 3 3 0 . 1 6 1 2 . 3 0 . 0 0505 7 . 2 4 0 . 8 8 6 . 2 2 S u p e r C r i t i c a l 35 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 2 0 0 0 0 . 0 5 6 . 0 0 0 . 9 4 0 . 0 2 0 . 4 1 0 . 5 8 0 . 3 6 0 . 1 1 1 5 . 7 0 . 0 0512 2 . 5 4 0 . 1 8 1 . 9 2 S u p e r C r i t i c a l 34 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 2 0 0 0 0 . 0 5 6 . 0 0 0 . 9 4 0 . 0 2 0 . 4 1 0 . 5 8 0 . 3 6 0 . 1 1 1 5 . 7 0 . 0 0512 2 . 5 4 0 . 1 8 1 . 9 2 S u p e r C r i t i c a l 33 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 2 0 0 0 0 . 1 4 6 . 0 0 1 . 5 7 0 . 0 4 0 . 5 4 0 . 9 1 0 . 4 4 0 . 1 9 2 6 . 1 0 . 0 0513 3 . 4 3 0 . 3 1 1 . 9 8 S u p e r C r i t i c a l 32 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 5 0 0 0 0 . 1 4 6 . 0 0 1 . 2 5 0 . 0 3 0 . 4 7 0 . 7 5 0 . 4 1 0 . 1 9 2 0 . 8 0 . 0 0512 4 . 7 5 0 . 4 5 3 . 1 0 S u p e r C r i t i c a l 38 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 2 0 0 0 0 . 2 9 6 . 0 0 2 . 2 9 0 . 0 7 0 . 6 7 1 . 2 4 0 . 4 9 0 . 2 7 3 8 . 2 0 . 0 0577 4 . 2 1 0 . 4 7 1 . 9 7 S u p e r C r i t i c a l 40 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 2 0 0 0 0 . 2 9 6 . 0 0 2 . 2 9 0 . 0 7 0 . 6 7 1 . 2 4 0 . 4 9 0 . 2 7 3 8 . 2 0 . 0 0577 4 . 2 1 0 . 4 7 1 . 9 7 S u p e r C r i t i c a l 36 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 2 0 0 0 0 . 2 9 6 . 0 0 2 . 2 9 0 . 0 7 0 . 6 7 1 . 2 4 0 . 4 9 0 . 2 7 3 8 . 2 0 . 0 0577 4 . 2 1 0 . 4 7 1 . 9 7 S u p e r C r i t i c a l 26 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 0 5 0 0 1 . 4 4 1 2 . 0 0 5 . 8 8 0 . 3 8 1 . 5 5 2 . 9 6 1 . 0 0 0 . 5 1 4 9 . 0 0 . 00443 3 . 7 6 0 . 7 1 1 . 0 7 S u p e r C r i t i c a l 28 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 0 5 0 0 1 . 8 5 1 5 . 0 0 6 . 0 6 0 . 4 6 1 . 7 2 3 . 2 4 1 . 2 3 0 . 5 4 4 0 . 4 0 . 00389 3 . 9 9 0 . 7 5 1 . 1 4 S u p e r C r i t i c a l 30 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 0 5 0 0 1 . 8 5 1 5 . 0 0 6 . 0 6 0 . 4 6 1 . 7 2 3 . 2 4 1 . 2 3 0 . 5 4 4 0 . 4 0 . 00389 3 . 9 9 0 . 7 5 1 . 1 4 S u p e r C r i t i c a l 31 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 5 0 0 0 0 . 5 0 6 . 0 0 2 . 4 0 0 . 0 7 0 . 6 8 1 . 2 8 0 . 4 9 0 . 3 6 4 0 . 0 0 . 0 0751 6 . 8 2 0 . 9 2 3 . 1 1 S u p e r C r i t i c a l 49 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 1 0 0 0 0 . 1 1 6 . 0 0 1 . 6 5 0 . 0 4 0 . 5 5 0 . 9 5 0 . 4 5 0 . 1 6 2 7 . 5 0 . 0 0506 2 . 5 1 0 . 2 4 1 . 4 1 S u p e r C r i t i c a l 50 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 1 0 0 0 0 . 2 6 6 . 0 0 2 . 6 1 0 . 0 8 0 . 7 2 1 . 3 7 0 . 5 0 0 . 2 6 4 3 . 5 0 . 0 0561 3 . 1 7 0 . 3 7 1 . 3 8 S u p e r C r i t i c a l 46 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 0 5 0 0 2 . 3 5 1 5 . 0 0 6 . 9 2 0 . 5 5 1 . 8 7 3 . 5 6 1 . 2 5 0 . 6 1 4 6 . 1 0 . 00405 4 . 2 5 0 . 8 6 1 . 1 2 S u p e r C r i t i c a l 48 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 0 5 0 0 2 . 4 7 1 5 . 0 0 7 . 1 2 0 . 5 7 1 . 9 0 3 . 6 3 1 . 2 5 0 . 6 3 4 7 . 5 0 . 00409 4 . 3 0 0 . 8 8 1 . 1 2 S u p e r C r i t i c a l 67 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 0 5 0 0 0 . 2 6 8 . 0 0 2 . 7 7 0 . 1 1 0 . 8 4 1 . 5 4 0 . 6 3 0 . 2 4 3 4 . 6 0 . 0 0463 2 . 4 2 0 . 3 2 1 . 0 4 S u p e r C r i t i c a l 72 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 1 0 0 0 0 . 0 4 6 . 0 0 1 . 0 0 0 . 0 2 0 . 4 2 0 . 6 1 0 . 3 7 0 . 1 0 1 6 . 6 0 . 0 0528 1 . 8 6 0 . 1 4 1 . 3 7 S u p e r C r i t i c a l 73 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 1 0 0 0 0 . 0 4 6 . 0 0 1 . 0 0 0 . 0 2 0 . 4 2 0 . 6 1 0 . 3 7 0 . 1 0 1 6 . 6 0 . 0 0528 1 . 8 6 0 . 1 4 1 . 3 7 S u p e r C r i t i c a l 74 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 1 9 2 0 0 0 . 0 5 6 . 0 0 0 . 5 5 0 . 0 1 0 . 3 1 0 . 3 5 0 . 2 9 0 . 1 1 9 . 1 0 . 0 0 515 5 . 5 9 0 . 5 3 5 . 5 9 S u p e r C r i t i c a l 61 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 1 0 0 0 0 . 0 4 6 . 0 0 1 . 0 0 0 . 0 2 0 . 4 2 0 . 6 1 0 . 3 7 0 . 1 0 1 6 . 6 0 . 0 0528 1 . 8 6 0 . 1 4 1 . 3 7 S u p e r C r i t i c a l 65 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 1 0 0 0 0 . 0 6 6 . 0 0 1 . 2 2 0 . 0 3 0 . 4 7 0 . 7 3 0 . 4 0 0 . 1 2 2 0 . 3 0 . 0 0504 2 . 1 0 0 . 1 7 1 . 3 9 S u p e r C r i t i c a l 66 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 3 2 8 0 0 0 . 1 2 6 . 0 0 0 . 7 3 0 . 0 1 0 . 3 6 0 . 4 6 0 . 3 3 0 . 1 7 1 2 . 2 0 . 0 0507 8 . 8 1 1 . 2 7 7 . 6 1 S u p e r C r i t i c a l 64 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 3 8 1 0 0 0 . 1 0 6 . 0 0 0 . 6 5 0 . 0 1 0 . 3 3 0 . 4 1 0 . 3 1 0 . 1 6 1 0 . 8 0 . 0 0504 8 . 7 6 1 . 2 5 8 . 0 5 S u p e r C r i t i c a l 56 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 0 5 0 0 1 . 0 0 1 2 . 0 0 4 . 7 9 0 . 2 9 1 . 3 7 2 . 5 7 0 . 9 8 0 . 4 2 3 9 . 9 0 . 00416 3 . 4 2 0 . 5 8 1 . 1 0 S u p e r C r i t i c a l 62 - 1 0 0 - Y e a r N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 0 5 0 0 0 . 7 4 8 . 0 0 5 . 0 9 0 . 2 3 1 . 2 3 2 . 2 8 0 . 6 4 0 . 4 1 6 3 . 6 0 . 0 0567 3 . 1 6 0 . 5 8 0 . 9 2 S u b C r i t i c a l 58 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 5 0 0 0 0 . 2 1 6 . 0 0 1 . 5 3 0 . 0 4 0 . 5 3 0 . 8 9 0 . 4 4 0 . 2 3 2 5 . 4 0 . 0 0536 5 . 3 4 0 . 5 7 3 . 1 3 S u p e r C r i t i c a l 57 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 0 5 0 6 0 0 . 2 1 6 . 0 0 1 . 5 2 0 . 0 4 0 . 5 3 0 . 8 9 0 . 4 4 0 . 2 3 2 5 . 4 0 . 0 0536 5 . 3 6 0 . 5 7 3 . 1 5 S u p e r C r i t i c a l 17 N o r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 1 0 . 1 0 0 0 0 0 . 2 1 6 . 0 0 1 . 2 8 0 . 0 3 0 . 4 8 0 . 7 7 0 . 4 1 0 . 2 3 2 1 . 4 0 . 0 0536 6 . 8 3 0 . 8 3 4 . 4 0 S u p e r C r i t i c a l Ci r c u l a r P i p e ( r e s i d e n c e a t e a s t h i l l s . f m 8 ) R e p o r t 4/ 2 8 / 2 0 2 0 6 : 3 9 : 2 3 P M Be n t l e y S y s t e m s , I n c . H a e s t a d M e t h o d s S o l u t i o n C e n te r Bentley FlowMaster V8i (SELECTseries 1 ) [ 0 8 . 1 1 . 0 1 . 0 3] 27 S i e m o n s C o m p a n y D r i v e S u i t e 2 0 0 W W a t e r t o w n , C T 0 6 7 9 5 U S A + 1 - 2 0 3 - 7 5 5 - 1 6 6 6 1 of 1 Page La b e l So l v e F o r Fr i c t i o n M e t h o d Ro u g h n e s s C o e f f i c i e n t Ch a n n e l S l o p e (f t / f t ) No r m a l D e p t h (i n ) Le f t S i d e S l o p e (f t / f t ( H : V ) ) Rig h t S i d e S l o p e (f t / f t ( H : V ) ) Dis c h a r g e (f t ³ / s ) Fl o w A r e a (f t ² ) We t t e d P e r i m e t e r (f t ) Hy d r a u l i c R a d i u s (i n ) To p W i d t h (f t ) Cr i t i c a l D e p t h (f t ) Cr i t i c a l S l o p e (f t / f t ) Velocity (ft/s)Velocity Head (ft)Specific Energy (ft)Froude Number Flow Type Notes Messages E D i t c h p e r C o n s t N o t e 3 4 - 1 No r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 3 0 . 0 1 2 0 0 4 . 1 9 1 . 0 0 1 . 0 0 0 . 3 8 0 . 1 2 0 . 9 9 1 . 4 8 0 . 7 0 0 . 3 9 0 . 0 06 7 4 3 . 1 1 0 . 1 5 0 . 5 0 1 . 3 1 S u p e r c r i t i c a l E D i t c h p e r C o n s t N o t e 3 4 - 2 No r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 3 0 . 0 1 2 0 0 4 . 9 2 1 . 0 0 1 . 0 0 0 . 5 8 0 . 1 7 1 . 1 6 1 . 7 4 0 . 8 2 0 . 4 6 0 . 0 06 3 7 3 . 4 5 0 . 1 9 0 . 6 0 1 . 3 5 S u p e r c r i t i c a l W D i t c h p e r C o n s t N o t e 3 4 - 1 No r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 3 0 . 0 1 2 0 0 2 . 6 4 1 . 0 0 1 . 0 0 0 . 1 1 0 . 0 5 0 . 6 2 0 . 9 3 0 . 4 4 0 . 2 4 0 . 0 07 9 6 2 . 2 8 0 . 0 8 0 . 3 0 1 . 2 1 S u p e r c r i t i c a l W D i t c h p e r C o n s t N o t e 3 4 - 2 No r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 3 0 . 0 1 2 0 0 2 . 9 6 1 . 0 0 1 . 0 0 0 . 1 5 0 . 0 6 0 . 7 0 1 . 0 5 0 . 4 9 0 . 2 7 0 . 0 07 6 3 2 . 4 6 0 . 0 9 0 . 3 4 1 . 2 4 S u p e r c r i t i c a l St r e e t D i t c h p e r C o n s t N o t e 14 No r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 3 0 . 0 1 3 3 0 3 . 1 1 1 . 0 0 1 . 0 0 0 . 1 8 0 . 0 7 0 . 7 3 1 . 1 0 0 . 5 2 0 . 2 9 0 . 0 07 4 5 2 . 6 8 0 . 1 1 0 . 3 7 1 . 3 1 S u p e r c r i t i c a l St r e e t D i t c h p e r C o n s t N o t e 12 No r m a l D e p t h M a n n i n g F o r m u l a 0. 0 1 3 0 . 0 1 3 3 0 1 . 0 5 1 . 0 0 1 . 0 0 0 . 0 1 0 . 0 1 0 . 2 5 0 . 3 7 0 . 1 8 0 . 0 9 0 . 0 10 9 6 1 . 3 0 0 . 0 3 0 . 1 1 1 . 1 0 S u p e r c r i t i c a l Tr i a n g u l a r C h a n n e l ( r e s i d e n c e a t e a s t h i l l s . f m 8 ) R e p o r t 2/ 2 8 / 2 0 2 0 3 : 3 3 : 4 7 P M Be n t l e y S y s t e m s , I n c . H a e s t a d M e t h o d s S o l u t i o n C e n te r Bentley FlowMaster V8i (SELECTseries 1 ) [ 0 8 . 1 1 . 0 1 . 0 3] 27 S i e m o n s C o m p a n y D r i v e S u i t e 2 0 0 W W a t e r t o w n , C T 0 6 7 9 5 U S A + 1 - 2 0 3 - 7 5 5 - 1 6 6 6 1 of 1 Page Project Description Friction Method Manning Formula Solve For Bottom Width Input Data Roughness Coefficient 0.012 Channel Slope 0.02000 ft/ft Normal Depth 3.00 in Discharge 1.89 ft³/s Results Bottom Width 1.34 ft Flow Area 0.34 ft² Wetted Perimeter 1.84 ft Hydraulic Radius 2.19 in Top Width 1.34 ft Critical Depth 0.39 ft Critical Slope 0.00530 ft/ft Velocity 5.63 ft/s Velocity Head 0.49 ft Specific Energy 0.74 ft Froude Number 1.98 Flow Type Supercritical GVF Input Data Downstream Depth 0.00 in Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 in Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 3.00 in Critical Depth 0.39 ft Channel Slope 0.02000 ft/ft Critical Slope 0.00530 ft/ft Worksheet for Curb-o-Let_TCD-327 4/28/2020 6:42:09 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Project Description Friction Method Manning Formula Solve For Bottom Width Input Data Roughness Coefficient 0.012 Channel Slope 0.02000 ft/ft Normal Depth 3.00 in Bottom Width 1.34 ft Discharge 1.89 ft³/s Cross Section Image Cross Section for Curb-o-Let_TCD-327 4/28/2020 3:25:09 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Appendix E. Pico Ave Hydraulics Calculations La b e l So l v e F o r Ch a n n e l S l o p e (f t / f t ) Di s c h a r g e (f t ³ / s ) Gu t t e r W i d t h (f t ) Gu t t e r C r o s s S l o p e (f t / f t ) Ro a d C r o s s S l o p e (f t / f t ) Sp r e a d (f t ) Ma n n i n g C o e f f i c i e n t Flow Area (ft²)Depth (in)Gutter Depression (ft)Velocity (ft/s) Pic o G u t t e r - 1 S p r e a d 0 . 0 1 2 9 0 0 . 8 8 2 . 0 0 0 . 0 8 3 3 0 . 0 2 0 4 . 3 8 0.015 0 . 3 2 2 . 5 7 0 . 1 3 2 . 7 6 Pic o G u t t e r - 2 S p r e a d 0 . 0 4 7 6 0 1 . 2 4 2 . 0 0 0 . 0 8 3 3 0 . 0 2 0 3 . 3 5 0.015 0 . 2 4 2 . 3 2 0 . 1 3 5 . 1 9 Pic o G u t t e r - 3 S p r e a d 0 . 0 3 1 1 0 1 . 2 6 2 . 0 0 0 . 0 8 3 3 0 . 0 2 0 4 . 1 1 0.015 0 . 3 0 2 . 5 1 0 . 1 3 4 . 2 6 Gu t t e r ( r e s i d e n c e a t e a s t h i l l s . f m 8 ) R e p o r t 4/ 2 8 / 2 0 2 0 6 : 4 4 : 1 4 P M Be n t l e y S y s t e m s , I n c . H a e s t a d M e t h o d s S o l u t i o n C e n te r Bentley FlowMaster V8i (SELECTseries 1 ) [ 0 8 . 1 1 . 0 1 . 0 3] 27 S i e m o n s C o m p a n y D r i v e S u i t e 2 0 0 W W a t e r t o w n , C T 0 6 7 9 5 U S A + 1 - 2 0 3 - 7 5 5 - 1 6 6 6 1 of 1 Page