HomeMy WebLinkAboutTract 6536 Drainage Study2
Table of Contents
1.0 PURPOSE...................................................................................................................3
2.0 GUIDELINES...............................................................................................................3
3.0 DESIGN APPROACH .................................................................................................3
4.0 CONCLUSION AND RECOMMENDATIONS.............................................................4
Soil Map ................................................................................................... back of report
Hydrology Calculations............................................................................. back of report
Inlet Sizing Calculations ........................................................................... back of report
Hydraulic Calculations and Pipe Profiles.................................................. back of report
Sump Exhibit ............................................................................................ back of report
Drainage Exhibit.........................................................................sleeve in back of report
3
1.0 PURPOSE
The purpose for this drainage study is as follows:
1. To provide a storm drainage system in accordance with the City of Bakersfield
requirements and guidelines.
2. To provide an economical and reasonable design for storm drain conveyance and
disposal facilities.
2.0 GUIDELINES
The following design standards were used in the development of this study:
1. Initial times to concentration (roof to gutter) are 15 minutes for R-1 Development.
2. The soil group was obtained from the US Department of Agriculture Soils Survey.
Soil group for this site is Type A:
127 – Granoso sandy loam, 0 to 2 percent slopes, overwash
(approx. 40% of project)
174 - Kimberlina fine sandy loam, 0 to 2 percent slopes
(approx. 60% of project)
3. The runoff coefficients used are:
0.15 - Park
0.38 - R-1, 7,500 S.F.
0.90 - Commercial
0.95 - Pavement, drives, and roofs
3. Rainfall intensity curves used are those shown on Plate D-1 of the City of Bakersfield,
Subdivision & Engineering Manual.
4. Sub-areas using multiple run-off coefficients are given a weighted average based on
the area relative to each coefficient.
3.0 DESIGN APPROACH
The purpose for this study is to amend the previously approved drainage report for Tract 6536.
The changes involved the addition of a 9.96 acre commercial lot on the southwesterly corner of
Panama Lane and Old River Road. Part of this change includes eliminating Matamora Way and
extending Fort Henry Way to Davis Bridge Avenue. Drainage Area 6 still includes approximately
4.81 acres from Tract 6824, formerly Area I-5 in the Approved Tract 6536 Drainage Study.
Drainage Area 7 also still includes approximately 1.07 acres of the park site, formerly Area I-6 in
the Approved Tract 6536 Drainage Study. Based on the revision, Catch Basin #6 was added at
the T-intersection of Fort Sanders Avenue and Mossy Creek Way to replace cross gutter from the
previous drainage submittal.
The flows for the sizing of the pipes were estimated utilizing the City of Bakersfield Rational
Method in accordance with the Subdivision Standards. Flows were computed for the 10-year
event using the formula Q = CIA, where Q is the flow in cubic feet per second, C is the runoff
coefficient, I is the intensity in inches per hour, and A is the catchment’s area in acres. Since the
main purpose of this report is the storm drain system leading to the basin and the curb capacities
were determined.
The required sump volume was calculated using the City of Bakersfield sump volume equation
(V=0.15 x Ʃ (CxA)). The total contributing area equals 81.20 acres; this acreage is divided into
the areas as noted above. The weighted coefficient values are provided for each area, and the
calculations for the required and provided volumes are shown below and on the Retention Basin
Exhibit.
4
Area Acres Coefficient C x A
TRACT 6825
Park 2.34 0.15 0.35
R-1, 7500 SF 32.99 0.38 12.54
Old River Road &
Berkshire Road 5.23 0.95 4.97
TRACT 6825 Ʃ(CXA) =17.86
TRACT 6536
Park 1.07 0.15 0.16
R-1, 7500 SF 23.36 0.38 8.88
R-1, 6700 SF 3.10 0.4 1.24
Commercial 9.96 0.9 8.96
Panama Lane & Old
River Road 3.15 0.95 2.99
TRACT 6536 Ʃ(CXA) =22.23
ALL TRACTS Ʃ(CXA) =40.09
TOTAL 81.20 TOTAL VOLUME (AF) =6.01
* Assumed based on a plan provided by the City of Bakersfield
The rational method for the 10-year event was performed using Autodesk Hydraflow Extension
2015. This program routes the flows and calculates the HGL for the system. The program has
the ability to calculate the discharge, but it also allows you to enter your own value. Since these
values have been calculated in the hydrology spreadsheet, the calculated the time of
concentration values were used. The same spreadsheet was used to determine curb capacity in
a 10-year event. The inlet sizing cal0culations also verify the proposed flows do not exceed the
curb height.
4.0 CONCLUSION AND RECOMMENDATIONS
The flows from the 10-year event were calculated and routed. The beginning HGL was estimated
to be 4.5’ above the basin bottom at the outlet structure. All the pipes in this system were sized
to be 18” RCP, 24” RCP, and 30” RCP. The HGL is not less than 0.5’ below the existing grade at
any manhole and catch basin.
The main objectives of this study were to design an economical storm drain system and meet the
design standards set by the City of Bakersfield. The storm drain system will be able to handle a
10-year event. The basin will have a design water surface depth of 9.0’ with a minimum of 1’ of
freeboard. The overall sump will be able to store 6.62 acre-feet of water with a required volume of
6.01 acre-feet.
SOIL MAP
Hydrologic Soil Group—Kern County, California, Northwestern Part
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4/13/2016
Page 1 of 4
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307580 307650 307720 307790 307860 307930 308000 308070 308140 308210 308280
307580 307650 307720 307790 307860 307930 308000 308070 308140 308210 308280
35° 17' 47'' N
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35° 17' 47'' N
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35° 17' 31'' N
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35° 17' 31'' N
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N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 11N WGS84
0150300600900Feet
04590180270Meters
Map Scale: 1:3,370 if printed on A landscape (11" x 8.5") sheet.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at 1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil line
placement. The maps do not show the small areas of contrasting
soils that could have been shown at a more detailed scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more accurate
calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as of
the version date(s) listed below.
Soil Survey Area: Kern County, California, Northwestern Part
Survey Area Data: Version 8, Sep 9, 2015
Soil map units are labeled (as space allows) for map scales 1:50,000
or larger.
Date(s) aerial images were photographed: Aug 13, 2013—Oct 23,
2013
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor shifting
of map unit boundaries may be evident.
Hydrologic Soil Group—Kern County, California, Northwestern Part
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4/13/2016
Page 2 of 4
Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map Unit — Kern County, California, Northwestern Part (CA666)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
127 Granoso sandy loam, 0
to 2 percent slopes,
overwash
A 16.8 39.6%
174 Kimberlina fine sandy
loam, 0 to 2 percent
slopes MLRA 17
A 25.6 60.4%
Totals for Area of Interest 42.4 100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive precipitation
from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well drained
soils that have moderately fine texture to moderately coarse texture. These soils
have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay layer
at or near the surface, and soils that are shallow over nearly impervious material.
These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in their
natural condition are in group D are assigned to dual classes.
Hydrologic Soil Group—Kern County, California, Northwestern Part
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4/13/2016
Page 3 of 4
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—Kern County, California, Northwestern Part
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4/13/2016
Page 4 of 4
TIME OF CONCENTRATION (Tc)
CALCULATIONS
CITY OF BAKERSFIELD RATIONAL METHOD
(In accordance with City of Bakersfield Standards)
TABLE OF RUNOFF COEFFICIENTS
R-1, 6000 SF0.42
JOB TITLE:TRACT 6536 R-1, 6750 SF0.40
DATE:Apr-16 R-1, 7500 SF0.38
R-1, 10000 SF0.34
Rational Values:R-1, 15000 SF0.27
Event:10YEAR Values: 5, 10, 50R-3, R-4, M-H0.80
M.A.P.6in./yr. Values: 6, 10, 15, 20, 25, 30Commercial0.90
Industrial 0.80
Curve Values Parks 0.15
a:2.38I=a+bTc (Tc<20min.)Grasslands, Type A Soil0.15
b:-0.058 Grasslands, Type B Soil0.25
P60:0.550I=K1*(6.02*Tc)^(0.17*LN(p60/K1)Grasslands, Type C Soil0.35
K1:40.00 (Tc>=20min.)Grasslands, Type D Soil0.45
Pavement, drives & roofs0.95
Backyards 0.05
Lawn-landscape 2% slope0.100.17
Lawn-landscape 2-7% slope0.150.22
Lawn-landscape 7% slope0.200.35
SUBAREACIArslt TcLdHSgQStreetVTrial TcRoof toTmDCurb
NAMERunoff Intensity TotalTimeLengthElev.GutterFlowTypeVel.MIN.GutterTravelPipeCap
Coef.IN/HRAreaConc.FeetDiff.SlopeCFSFPSTimeTimeDia.In
AC.MIN.FeetFt/Ft MIN.MIN.In.
AREA 1 0.95 1.80 0.88 10.003000.310.10%1.50601.6410.000 3.043.73
AREA 2 0.95 1.801.10 10.005350.950.18%1.88601.7110.000 5.224.03
AREA 3 0.90 1.519.96 15.0055301.001.50%13.53606.1415.000 15.005.70
AREA 4 0.50 1.555.54 14.316603.510.53%4.29602.5514.3110 4.314.51
AREA 5 0.38 1.435.12 16.289144.970.54%2.79602.4216.2810 6.284.08
AREA 6 0.38 1.1313.27 22.1817846.820.38%5.77602.4422.1810 12.185.14
AREA 7 0.33 1.384.77 17.159974.610.46%2.17602.3217.1510 7.153.78
Required Sump Capacity = 0.15 x C x A =3.34ac-ft
C =0.55A=40.64acres
Tc CALCULATIONS
TRACT 6536 - INPUT
Hydrology_10_yr
McIntosh Associates
2001 Wheelan Ct
Bakersfield, CA 93309 10 yr Calc
7611.90
INLET SIZING CALCULATIONS
Inlet Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Wednesday, Apr 13 2016
Drainage Area 1 - Catch Basin # 5
Curb Inlet
Location= Sag
Curb Length (ft)= 3.50
Throat Height (in)= 4.00
Grate Area (sqft)= -0-
Grate Width (ft)= -0-
Grate Length (ft)= -0-
Gutter
Slope, Sw (ft/ft)= 0.083
Slope, Sx (ft/ft)= 0.020
Local Depr (in)= 2.00
Gutter Width (ft)= 2.00
Gutter Slope (%)= -0-
Gutter n-value= -0-
Calculations
Compute by:Known Q
Q (cfs)= 1.50
Highlighted
Q Total (cfs)= 1.50
Q Capt (cfs)= 1.50
Q Bypass (cfs)= -0-
Depth at Inlet (in)= 4.44
Efficiency (%)= 100
Gutter Spread (ft)= 3.87
Gutter Vel (ft/s)= -0-
Bypass Spread (ft)= -0-
Bypass Depth (in)= -0-
Inlet Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Wednesday, Apr 13 2016
Drainage Area 2 - Catch Basin # 4
Curb Inlet
Location= Sag
Curb Length (ft)= 3.50
Throat Height (in)= 4.00
Grate Area (sqft)= -0-
Grate Width (ft)= -0-
Grate Length (ft)= -0-
Gutter
Slope, Sw (ft/ft)= 0.083
Slope, Sx (ft/ft)= 0.020
Local Depr (in)= 2.00
Gutter Width (ft)= 2.00
Gutter Slope (%)= -0-
Gutter n-value= -0-
Calculations
Compute by:Known Q
Q (cfs)= 1.88
Highlighted
Q Total (cfs)= 1.88
Q Capt (cfs)= 1.88
Q Bypass (cfs)= -0-
Depth at Inlet (in)= 4.84
Efficiency (%)= 100
Gutter Spread (ft)= 5.52
Gutter Vel (ft/s)= -0-
Bypass Spread (ft)= -0-
Bypass Depth (in)= -0-
Inlet Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Wednesday, Apr 13 2016
Drainage Area 4 - Catch Basin # 3
Curb Inlet
Location= Sag
Curb Length (ft)= 3.50
Throat Height (in)= 4.00
Grate Area (sqft)= -0-
Grate Width (ft)= -0-
Grate Length (ft)= -0-
Gutter
Slope, Sw (ft/ft)= 0.083
Slope, Sx (ft/ft)= 0.020
Local Depr (in)= 2.00
Gutter Width (ft)= 2.00
Gutter Slope (%)= -0-
Gutter n-value= -0-
Calculations
Compute by:Known Q
Q (cfs)= 4.29
Highlighted
Q Total (cfs)= 4.29
Q Capt (cfs)= 4.29
Q Bypass (cfs)= -0-
Depth at Inlet (in)= 7.50
Efficiency (%)= 100
Gutter Spread (ft)= 8.27
Gutter Vel (ft/s)= -0-
Bypass Spread (ft)= -0-
Bypass Depth (in)= -0-
Inlet Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Wednesday, Apr 13 2016
Drainage Area 5 - Catch Basin # 6
Curb Inlet
Location= Sag
Curb Length (ft)= 3.50
Throat Height (in)= 4.00
Grate Area (sqft)= -0-
Grate Width (ft)= -0-
Grate Length (ft)= -0-
Gutter
Slope, Sw (ft/ft)= 0.083
Slope, Sx (ft/ft)= 0.020
Local Depr (in)= 2.00
Gutter Width (ft)= 2.00
Gutter Slope (%)= -0-
Gutter n-value= -0-
Calculations
Compute by:Known Q
Q (cfs)= 2.79
Highlighted
Q Total (cfs)= 2.79
Q Capt (cfs)= 2.79
Q Bypass (cfs)= -0-
Depth at Inlet (in)= 5.69
Efficiency (%)= 100
Gutter Spread (ft)= 9.09
Gutter Vel (ft/s)= -0-
Bypass Spread (ft)= -0-
Bypass Depth (in)= -0-
Inlet Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Wednesday, Apr 13 2016
Drainage Area 6 - Catch Basin # 2
Curb Inlet
Location= Sag
Curb Length (ft)= 5.00
Throat Height (in)= 4.00
Grate Area (sqft)= -0-
Grate Width (ft)= -0-
Grate Length (ft)= -0-
Gutter
Slope, Sw (ft/ft)= 0.083
Slope, Sx (ft/ft)= 0.020
Local Depr (in)= 2.00
Gutter Width (ft)= 2.00
Gutter Slope (%)= -0-
Gutter n-value= -0-
Calculations
Compute by:Known Q
Q (cfs)= 5.77
Highlighted
Q Total (cfs)= 5.77
Q Capt (cfs)= 5.77
Q Bypass (cfs)= -0-
Depth at Inlet (in)= 7.28
Efficiency (%)= 100
Gutter Spread (ft)= 7.35
Gutter Vel (ft/s)= -0-
Bypass Spread (ft)= -0-
Bypass Depth (in)= -0-
Inlet Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Wednesday, Apr 13 2016
Drainage Area 7 - Catch Basin # 1
Curb Inlet
Location= Sag
Curb Length (ft)= 3.50
Throat Height (in)= 4.00
Grate Area (sqft)= -0-
Grate Width (ft)= -0-
Grate Length (ft)= -0-
Gutter
Slope, Sw (ft/ft)= 0.083
Slope, Sx (ft/ft)= 0.020
Local Depr (in)= 2.00
Gutter Width (ft)= 2.00
Gutter Slope (%)= -0-
Gutter n-value= -0-
Calculations
Compute by:Known Q
Q (cfs)= 2.17
Highlighted
Q Total (cfs)= 2.17
Q Capt (cfs)= 2.17
Q Bypass (cfs)= -0-
Depth at Inlet (in)= 5.12
Efficiency (%)= 100
Gutter Spread (ft)= 6.71
Gutter Vel (ft/s)= -0-
Bypass Spread (ft)= -0-
Bypass Depth (in)= -0-
HYDRAULIC CALCULATIONS
AND PIPE PROFILES
10-YEAR STORM
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BASIN EXHIBITS
TRACT 6825 and 6536
BASIN SIZING CALCULATIONS
1 343.0
342.0 333.0
9 feet
Abtm =25,440sq ft=0.58acres
Amid =31,942sq ft=0.73acres
Atop =39,038sq ft=0.90acres
Provided Sump Capacity =288,368 Cu. FT 6.62 AC-FT
TABLE OF RUNOFF COEFFICIENTS TR 6825 TR 6536 C x A =
R-1, 6000 SF0.42
R-1, 6750 SF0.4 3.10 1.24
R-1, 7500 SF0.38 32.99 23.36 21.41
R-1, 10000 SF0.34
R-1, 15000 SF0.27
R-2 0.55
R-3, R-4, M-H0.8
Commercial0.9 9.96 8.96
Industrial0.8
Parks 0.15 2.34 1.07 0.51
Grasslands, Type A Soil0.15
Grasslands, Type B Soil0.25
Grasslands, Type C Soil0.35
Grasslands, Type D Soil0.45
Pavement, drives & roofs0.95 5.23 3.15 7.97
Backyards0.05
Lawn-landscape 2% slope0.17
Lawn-landscape 2-7% slope0.22
Lawn-landscape 7% slope0.35
n C x A =40.09
TR 6825 TR 6536 Total
40.57 40.64 =Acres 81.21
Required Sump Capacity = 0.15 x C x A =0.15 X n C x A =6.01AC-FT
Provided Sump Capacity
Required Sump Capacity
Volume = 1/6 x (0.55+2.83+0.88) x 9.0 = 1/6 x (4.26) x 9.0
Depth from Design Water Surface =
Bottom Area of Sump
Half Depth Area of Sump
Area of Design Water Level
Prismoidal Formula: Volume = 1/6 x(Abtm+4Amid+Atop) x D
Freeboard (ft)=
Water Surface Elev =
Lowest Inlet Elev =
Bottom Basin Elev =
.6
DRAINAGE EXHIBITS