HomeMy WebLinkAboutTract 7267 - Drainage Study Addendum
DRAINAGE REPORT ADDENDUM
Tract Map 7267
Bakersfield, CA
May 20, 2015
Prepared For:
River Ranch Community LLC
S&S Homes of the Central Coast, Inc.
998 Huston Street, Suite C
Grover Beach, CA 93433
Prepared By:
1998 Santa Barbara Avenue, Suite 200
San Luis Obispo, CA 93401
Phone: (805) 250-2891
Fax: (805) 250-2891
130109 2
TABLE OF CONTENTS
I. Project Description and Overview
II. Watershed Sub-Area
III.
Surface Flow for Curb 5 yr.
IV. Surface Flow for Pipes 10 yr.
V. Pipe Flows 10 yr.
VI. Hydraulic Grade line
VII. Sump Sizing
Appendix A. Pipe Calculation, Nomograph, Sub-area and Stormdrain Map,
130109 4
I. PROJECT DESCRIPTION AND
OVERVIEW
130109 3
I. INTRODUCTION
This drainage report addendum has been prepared for River Ranch Community, LLC for the development
of a new single family residential subdivision community in Bakersfield, California. The report modifies
the initial time of concentration at sub-area A3. Additional information has also been provided regarding
the HGL and existing drainage basin.
130109 5
II. WATERSHED SUB-AREAS
ACREAGELENGTHFALL
(acres)(feet)(feet)
A1*0.380.60--------------
A20.381.185402.660.49%
A3*0.381.05------------
A40.382.744291.740.41%
A50.381.323591.130.31%
A6*0.950.534876.891.41%
B1*0.380.33--------------
B20.381.052680.80.30%
C1*0.380.27--------------
C20.380.97320.950.30%
C3*0.380.39------------
C40.380.702230.970.43%
C50.381.154952.670.54%
C6*0.950.595452.70.50%
D1*0.380.35--------------
D20.382.976693.370.50%
EE1*0.951.028375.350.64%
FF1*0.950.525036.661.32%
* Indicates initial sub-area.
B
C
D
WATERSHED AVERAGE
SLOPEC-VALUESUB-AREA
A
130109 - River Ranch Community, LLC
APPROVED:DATEDATE AGENCY REPRESENTATIVE DIVERSIFIED PROJECT SERVICES INTERNATIONAL REVISIONSAPP STORM DRAIN EXHIBIT TR7267 - BRIDLE CREEK 5/18/15 PROJECT:130109 SHEET1 OF 1 SHEETSREVDATEDPSI, Inc. DivisionWE SNCivil THE DELIVERY OF THIS DRAWING SHOULD NOT BE CONSTRUED TO PROVIDE AN EXPRESS WARRANTY OR GUARANTEE TO ANYONE THAT ALL DIMENSIONS AND DETAILS ARE EXACT OR TO INDICATE THAT THE USE OF THIS DRAWING IMPLIES THE REVIEW AND APPROVAL OF DPSI OF ANY FUTURE USE. ANY USE OF THIS INFORMATION IS AT THE SOLE RISK OF THE USER.FOR DRAINAGE STUDY APPROVAL 3/2/15AFOR DRAINAGE STUDY APPROVAL 5/18/15B
130109 6
III. SURFACE FLOW FOR CURB 5 YR
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d=3.1"d=2.5"d=2.8"d=3.2"d=3.1"d=2.6"d<2"MAX Depth = 3.2"
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130109 7
IV. SURFACE FLOW FOR PIPES 10 YR.
DA
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MAX Depth = 3.3"MAX Depth = 3.2"MAX Depth = 2.6"MAX Depth = 3.6"MAX Depth = 2.9"MAX Depth = 4.6"
RA
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130109 8
V. PIPE FLOWS 10 YR.
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130109 9
VI. HYDRAULIC GRADE LINE
DATE:JOB NO.PROJECT
Q10 RUNPIPE DIA.VELOCITYK-V2 CHANGEHGL
ATFROMCFS(FEET)(FEET)(FT/SEC)FACTOR 2GIN HGLELEV.
340.33
Ex Stub 340.33
EX (MH#5)MH#47.071441.54.730.91341.24
MH#4 0.30341.54<
MH#4MH#33.333711.53.380.23341.77
MH#3 0.20341.97<
MH#3CB#41.438131.52.690.03341.99
CB#41.4382.691.20.110.13342.13<
MH#3CB#42.034231.52.930.06342.02
CB#32.0342.931.20.130.16342.18<
MH#4MH#24.0165901.53.552.10343.64
MH#2 0.25343.89<
MH#2CB#50.889401.52.330.06343.95
CB#50.8892.331.20.080.10344.05<
MH#2 MH#13.828721.53.480.25344.14
MH#1 0.23344.37<
MH#1CB#20.676131.52.160.02344.39
CB#20.6762.161.20.070.09344.47<
MH#1CB#13.309231.53.350.07344.44
CB#13.3093.351.20.170.21344.65<
EX MHEX CB1.579441.52.460.08340.41
EX. CB1.5792.461.20.090.11340.52<
Factors Applied to Velocity Head Pipe Losses Calculated by Manning's Formula
K-Factor for Inlet Structure =1.2HGL = 2.87n2lv2d-4/3
K-Factor for Outlet Structure =1.0wheren = 0.011 for reinforced concrete pipe
n = 0.013 for PVC pipe
v = velocity (ft/sec)
d = pipe diameter (feet)
HYDRAULIC GRADE LINE CALCULATIONS
16-Jun-15CE130109TRACT 7267
ARRIVING
From Lusich Revised Master Drainage Plan Updated 10/21/2005 @ ex STUB (MH #11)*
* HGL as shown in the Revised Master Plan was lowered from 342.51' at MH 11 (Called Existing Manhole in this Study)
by 2.18' per the sump lowering as specified with Tract 7243.
DATE:JOB NO.PROJECT
Normal Difference
Inlet NoFlowlineHGLFL-HGLAllowed
EX CB343.56340.523.040.5
MH#5343.70340.333.370.5
MH#4346.50341.544.960.5
MH#3346.50341.974.530.5
CB#4346.37342.134.240.5
CB#3346.37342.184.190.5
MH#2348.80343.894.910.5
CB#5348.67344.054.620.5
MH#1348.50344.374.130.5
CB#2348.37344.473.900.5
CB#1348.49344.653.840.5
16-Jun-15CE130109TRACT 7267
130109 10
VII. SUMP SIZING
130109 11
VII. SUMP SIZING
The sump was sized to retain 184.49 acres of which Tr 7267 is a part. The sump has been deepened by 4’
to lower the HGL, which also increases the design capacity.
130109 11
APPENDIX A:
PIPE CALCULATIONS, NOMOGRAPH, SUB-AREA AND STORMDRAIN
MAP, MANNINGS PIPE CACULATIONS, REFERENCE MATERIAL
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Wednesday, May 20 2015
CB#1 TO MH#1
Circular
Diameter (ft)= 1.50
Invert Elev (ft)= 1.00
Slope (%)= 0.30
N-Value= 0.013
Calculations
Compute by:Known Q
Known Q (cfs)= 3.31
Highlighted
Depth (ft)= 0.82
Q (cfs)= 3.310
Area (sqft)= 0.99
Velocity (ft/s)= 3.35
Wetted Perim (ft)= 2.50
Crit Depth, Yc (ft)= 0.70
Top Width (ft)= 1.49
EGL (ft)= 0.99
0 1 2 3
Elev (ft)Section
0.50
1.00
1.50
2.00
2.50
3.00
Reach (ft)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Wednesday, May 20 2015
MH#4 TO MH#5
Circular
Diameter (ft)= 1.50
Invert Elev (ft)= 1.00
Slope (%)= 0.50
N-Value = 0.013
Calculations
Compute by:Known Q
Known Q (cfs)= 7.07
Highlighted
Depth (ft)= 1.17
Q (cfs)= 7.070
Area (sqft)= 1.48
Velocity (ft/s)= 4.77
Wetted Perim (ft)= 3.26
Crit Depth, Yc (ft)= 1.03
Top Width (ft)= 1.24
EGL (ft)= 1.52
0 1 2 3
Elev (ft)Section
0.50
1.00
1.50
2.00
2.50
3.00
Reach (ft)
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Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Wednesday, May 20 2015
MH#1 to MH#2
Circular
Diameter (ft)= 1.50
Invert Elev (ft)= 1.00
Slope (%)= 0.30
N-Value = 0.013
Calculations
Compute by:Known Q
Known Q (cfs)= 3.86
Highlighted
Depth (ft)= 0.90
Q (cfs)= 3.860
Area (sqft)= 1.11
Velocity (ft/s)= 3.48
Wetted Perim (ft)= 2.66
Crit Depth, Yc (ft)= 0.75
Top Width (ft)= 1.47
EGL (ft)= 1.09
0 1 2 3
Elev (ft)Section
0.50
1.00
1.50
2.00
2.50
3.00
Reach (ft)
You created this PDF from an application that is not licensed to print to novaPDF printer (http://www.novapdf.com)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Wednesday, May 20 2015
MH#2 TO MH#4
Circular
Diameter (ft)= 1.50
Invert Elev (ft)= 1.00
Slope (%)= 0.30
N-Value = 0.013
Calculations
Compute by:Known Q
Known Q (cfs)= 4.35
Highlighted
Depth (ft)= 0.98
Q (cfs)= 4.350
Area (sqft)= 1.23
Velocity (ft/s)= 3.55
Wetted Perim (ft)= 2.83
Crit Depth, Yc (ft)= 0.80
Top Width (ft)= 1.43
EGL (ft)= 1.18
0 1 2 3
Elev (ft)Section
0.50
1.00
1.50
2.00
2.50
3.00
Reach (ft)
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