HomeMy WebLinkAboutTract 6612 Drainage Study130036
DRAINAGE STUDY
FOR
SUMMERLAND APARTMENTS
Submitted to
City of Bakersfield
1501 Truxtun Avenue
Bakersfield, CA 93301
MARCH 2014
Summerland Apartments iii
Drainage Study 130036
Table of Contents
1 Introduction ............................................................................................................................ 1
2 Objective ................................................................................................................................. 1
3 Site Hydrology and Climatology .............................................................................................. 1
4 Proposed Drainage Improvements ......................................................................................... 2
5 Retention Basin ....................................................................................................................... 2
6 Conclusion ............................................................................................................................... 2
7 References .............................................................................................................................. 3
APPENDICES .................................................................................................................................... 4
Appendices
Appendix A Conditions of Approval
Appendix B Preliminary Soils Report
Appendix C City of Bakersfield Drainage Standards
Appendix D Hydraulic Calculations
Appendix E Hydraulic Profiles
Figures
Figure 1 Site Vicinity Map
Figure 2 Proposed Drainage System
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Drainage Study 130036
Abbreviations
To conserve space and improve readability, the following abbreviations may be used in this
report.
ASCE American Society of Civil Engineers
AWWA American Water Works Association
BACT Best Available Control Technology
CBC California Building Code
CEQA California Environmental Quality Act
CDPH California Department of Public Health
cfs Cubic feet per second
County County of Fresno
CWWS California Waterworks Standards
DWT Deep Well Turbine
FEMA Federal Emergency Management Agency
FY Fiscal year
GAC Granular Activated Carbon
gpd Gallons per day
gph Gallons per hour
gpm Gallons per minute
HP Horsepower
HS High School
Hz Hertz
MCC Motor control center
MCL Maximum Contaminate Level
MDD Maximum Day Demand
MG Million Gallons
mgd Million gallons per day
NFPA National Fire Protection Association
P Power
PDR Project Design Report
PHD Peak Hour Demand
PLC programmable logic control
POPCC Preliminary Opinion of Probable Construction Costs
PS Pump Station
psi pounds per square inch
Q Flow Rate
ROW Right of way
RTU radio telemetry unit
SCADA Supervisory Control and Data Acquisition
USEPA United States Environmental Protection Agency
V Volts
VFD Variable Frequency Drive
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Drainage Study 130036
1 Introduction
Summerland Apartments is a proposed 304-unit apartment complex to be developed in two
phases by Summerland Falls Investors, LP. The proposed location for the Summerland
Apartment complex is Kern County Assessor Parcel 572-010-02, an approximate 18.96-acre
area at the southeast corner of Allen Road and Reina Road. The site occupies the northwest
corner of Section 13, Township 29 South, Range 26 East, MDB&M. The existing City of
Bakersfield General Plan land use for the project site is High Medium Density Residential and
the zoning is R-2 – Limited Multiple-Family Dwelling. Located in the northeastern Bakersfield,
the site’s elevation ranges from 360-ft to 370-ft.
2 Objective
The objective of this drainage study is to conduct a hydrologic and hydraulic analysis of the
project site and design a storm drainage collection system that will adequately serve the
Summerland Apartments Complex. This study includes time of concentration calculations, pipe
design, hydraulic grade calculations and profiles, curb flooding checks, and retention basin
capacity.
3 Site Hydrology and Climatology
The hydrologic soils group associated with the project site is B. According to the Soils
Conservation Service, Group B Soils are characterized by having slow infiltration rates when
thoroughly wetted, consisting chiefly of moderately deep to deep, moderately well to well
drained soils with moderately coarse textures. These soils have a moderate rate of water
transmission and are generally suitable for storm water retention basins on a case-by-case
basis. The soils report for this site prepared by Soils Engineering, Inc. has been included in
Appendix B of this report.
The project site is located in Zone X, areas of minimal flooding, as determined by the Federal
Emergency Management Agency (FEMA). The FEMA Federal Insurance Rate Map (FIRM) for
Community-Panel 06029C1800E, effective September 2008, shows the project site within the
Zone X flood boundary.
The climate of the project location is characterized as arid-to-semiarid, with hot summers and
mild winters. According to NOAA, the mean annual precipitation for the region is 6.5 inches.
Summerland Apartments 2
Drainage Study 130036
The rainfall totals for the 2-year and 100-year return periods for the project site were estimated
using Isohyets from the Kern County Hydrology Manual.
4 Proposed Drainage Improvements
An overview of the proposed drainage system can be found in figure 2. This overview identifies
the boundaries of the tributary areas as well as indicating the location of all storm drain pipes,
inlets and outlets. The proposed drainage manages the runoff for the Summerland Apartment
complex as well as the drainage from Reina and Allen Roads where they front the property.
The on-site drainage facilities were designed for a 10-year storm event per the City of
Bakersfield standards (Appendix C). The preliminary soils investigation for the site is included in
Appendix B. The proposed system will drain into a private retention basin located at the
southeast corner of the property.
Appendix D includes all hydraulic calculations while profiles including the hydraulic grade lines
along the length of the storm drain pipes can be found in Appendix E. The profiles also show
that adequate cover is being provided between the hydraulic grade line and the drain inlets.
The storm drainage system was analyzed using StormCAD software by Bently.
5 Retention Basin
The retention basin for this will be privately maintained by the Summerland Apartment
Complex. It has been sized to retain the 2.41 acre-feet generated by the 10-year storm event
with an additional foot of freeboard in accordance with the City of Bakersfield standards. The
calculations for the basin’s volume can be found in Appendix D. As the basin depth exceeds the
City of Bakersfield standard maximum of 10 feet of depth a slope stability analysis was
performed at the basin site. The results of this testing can be found in Appendix B.
6 Conclusion
The onsite storm drain system was designed for an average recurrence interval of 10-years per
Section 2.3.1.4 of the City of Bakersfield Subdivision Design Manual. Discharge was computed
using the methods outlined in Section 2.3.2. These computations can be found in Appendix A.
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Drainage Study 130036
Curb flooding checks are included as a part of the above computations as the “gutter depth”
column of the design output table. Per these computations no curb flooding occurs given the
proposed grading and drainage. The curb flooding is using FlowMaster software by Bently and
the 5-year average recurrence interval as the design scenario. To prevent the flooding of the
drainage basins all drainages basin grates were assumed to be 50% blocked for calculation
purposes.
7 References
1. City of Bakersfield. Department of Public Works. Subdivision and Engineering Design
Manual. Bakersfield, CA: City of Bakersfield.
2. Federal Highway Administration. Hydraulic Engineering Circular No. 22, Second Edition,
Urban Drainage Design Manual. August 2001.
3. Kern County. Department of Planning and Development Services. Kern County
Hydrology Manual. Bakersfield, California: Kern County, 1992
4. FlowMaster V8i, Bently, 2009
5. StormCAD, V8i, Bently, 2010
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Drainage Study 130036
APPENDICES
Summerland Apartments
Drainage Study 130036
APPENDIX A
Conditions of Approval
Summerland Apartments
Drainage Study 130036
APPENDIX B
Preliminary Soils Report
Summerland Apartments
Drainage Study 130036
Slope Stability Amendment
Summerland Apartments
Drainage Study 130036
2010 Update
Summerland Apartments
Drainage Study 130036
APPENDIX C
City of Bakersfield Drainage Standards
Summerland Apartments
Drainage Study 130036
APPENDIX D
Hydraulic Calculations
Catchment FlexTable: DRAINAGE AREA
Catchment
Rational Flow
(ft³/s)
Catchment
Flow Time
(min)
Catchment
Intensity
(in/h)
Time of
Concentration
(min)
Catchment
CA
(acres)
Outflow
Node
Area
(acres)
Label
0.635.0001.8505.0000.336CB-10.420CM-1
2.3520.1501.19220.1501.957CB-22.060CM-2
0.3311.0001.73011.0000.192CB-30.240CM-3
0.4510.5901.73810.5900.256CB-40.320CM-4
0.5310.5801.73810.5800.304CB-50.380CM-5
0.9411.5901.71211.5900.544CB-60.680CM-6
0.6010.4701.74110.4700.344CB-70.430CM-7
0.1010.1501.74710.1500.057CB-80.060CM-8
0.4110.7101.73610.7100.232CB-90.290CM-9
0.5310.4001.74210.4000.304CB-100.380CM-10
0.6310.5501.73910.5500.360CB-110.450CM-11
0.8810.7801.73410.7800.504CB-120.630CM-12
0.4510.5401.73910.5400.256CB-130.320CM-13
1.4713.7601.51713.7600.960CB-141.200CM-14
0.1710.2801.74410.2800.095CB-150.100CM-15
0.1510.2801.74410.2800.086CB-160.090CM-16
0.6010.3201.74410.3200.344CB-170.430CM-17
0.7310.6401.73710.6400.416CB-180.520CM-18
0.9410.5401.73910.5400.536CB-190.670CM-19
0.8311.6201.71111.6200.480CB-200.600CM-20
0.4210.3701.74310.3700.240CB-210.300CM-21
1.1910.8601.73310.8600.680CB-220.850CM-22
0.1510.5101.74010.5100.088CB-230.110CM-23
1.4310.6201.73810.6200.816CB-241.020CM-24
0.7210.4001.74210.4000.408CB-250.510CM-25
1.3513.0301.56813.0300.856CB-261.070CM-26
0.7610.5901.73810.5900.432CB-270.540CM-27
0.9710.7001.73610.7000.552CB-280.690CM-28
0.7610.3901.74210.3900.432CB-290.540CM-29
0.7410.9901.73010.9900.424CB-300.530CM-30
0.7210.3801.74210.3800.408CB-310.510CM-31
1.1510.4701.74110.4700.656CB-320.820CM-32
1.156.8701.8136.8700.632CB-330.790CM-33
0.405.0001.8505.0000.216CB-340.270CM-34
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3/6/2014
Bentley StormCAD V8i (SELECTseries 3)
[08.11.03.84]
Bentley Systems, Inc. Haestad Methods Solution
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Page 2 of 2
27
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Bentley StormCAD V8i (SELECTseries 3)[08.11.03.84]
Be
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S
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I
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Manhole FlexTable: MANHOLE REPORT
HEC-22
Benching
Method
Headloss MethodElevation
(Invert Out)
(ft)
Diameter
(in)
Elevation
(Invert)
(ft)
Elevation
(Ground)
(ft)
Elevation
(Rim)
(ft)
Label
FlatHEC-22 Energy
(Second Edition)349.8848.0349.88363.22363.22MH-1
FlatHEC-22 Energy
(Second Edition)356.0148.0356.01363.81363.81MH-2
FlatHEC-22 Energy
(Second Edition)353.3448.0353.34363.04363.04MH-3
FlatHEC-22 Energy
(Second Edition)351.2648.0351.26362.24362.24MH-4
FlatHEC-22 Energy
(Second Edition)351.3148.0351.31362.19362.19MH-5
FlatHEC-22 Energy
(Second Edition)352.0248.0352.02364.02364.02MH-6
FlatHEC-22 Energy
(Second Edition)352.4248.0352.42364.47364.47MH-7
FlatHEC-22 Energy
(Second Edition)352.9248.0352.92365.07365.07MH-8
FlatHEC-22 Energy
(Second Edition)352.0848.0352.08364.25364.25MH-9
FlatHEC-22 Energy
(Second Edition)354.4248.0354.42367.01367.01MH-10
FlatHEC-22 Energy
(Second Edition)355.4048.0355.40366.56366.56MH-11
FlatHEC-22 Energy
(Second Edition)357.9448.0357.94366.06366.06MH-12
FlatHEC-22 Energy
(Second Edition)353.5448.0353.54368.03368.03MH-13
Page 1 of 127 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA +1-203-755-1666
3/5/2014
Bentley StormCAD V8i (SELECTseries 3)
[08.11.03.84]
Bentley Systems, Inc. Haestad Methods Solution
CenterSTORMCAD.stsw
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Boundary Condition TypeElevation (User
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Elevation
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User Defined Tailwater354.51348.51363.50OF-1
Page 1 of 127 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA +1-203-755-1666
3/6/2014
Bentley StormCAD V8i (SELECTseries 3)
[08.11.03.84]
Bentley Systems, Inc. Haestad Methods Solution
CenterSTORMCAD.stsw
Summerland Apartments
Drainage Study 130036
APPENDIX E
Hydraulic Profiles
Summerland Apartments
Drainage Study 130036
FIGURES
Figure 1
Site Vicinity Map
Figure 2
Proposed Drainage System