HomeMy WebLinkAboutCT 06-25; Robertson Ranch PA 21; Robertson Ranch PA 21; 2009-06-02SEWER STUDY
FOR
ROBERTSON RANCH EAST VILLAGE
PA 21
CT 06-25
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Prepared by:
Job No. 01-1014
December 18, 2007
Revised: March 2009
O'DAY CONSULTANTS, INC.
2710 Loker Avenue West
Suite 100
Carlsbad, California 92010
Tel: (760)931-7700
Fax: (760)931-8680
Tim Carroll
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RCE 32014
Exp. 12/31/10
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TABLE OF CONTENTS
SECTION 1
INTRODUCTION
Purpose of Study
SECTION 2
1. Vicinity Map
2. Flowrate Generation Criteria, City of Carlsbad, Engineering
Standards, Edition 2004
SECTION 3
Explanation of Formulas Used
Calculations of Qavg and Qpeak
Summary Table of Calculations
SECTION 4
Exhibit A - Sewer Analysis Exhibit
INTRODUCTION
Purpose of Study
This sewer analysis was prepared to determine the proposed flow depth and velocities
from planning area 21.
CITY OF OCEANSIDE
SITE
CITY OF VISTA
OF
SAN MARCOS
CITY OF ENCINITAS
VICINITY MAP
NO SCALE
E. Flowrate Generation
1) An Equivalent Dwelling Unit (EDU) =* 220 gal/day, Average Daily Flow (ADF)
2) A peaking factor (PR of 2.5 multiplied times the ADF shall be used to
determine Peak Daily Flows (PDF). PDF » ADF x 2.5
a) Residential: Single Family Residence = 1 EDU
b) Commercial Property: 1 EDU/1,800 ft2 (building space)
i) To convert raw land to square feet of building space, assume
30% coverage. This could vary significantly dependent
development constraints.
ii) To convert improved pads to square feet of building space,
assume 40% of coverage.
5.
3) Industrial Property:1 EDU/5,000 ft* (warehouse space)
1 EDU/1,800 ft2 (office space)
a) To convert raw land to square feet of building space, assume 30%
coverage. This could vary significantly dependent issues such as
environmental restrictions.
b) To convert improved pads to square feet of building space, assume 40%of coverage.
c) Assume 60% of building space is warehouse, and 40% is office space.
HORIZONTAL AND VERTICAL LAYOUT
A. Streets: See City of Carlsbad Standard Drawing No. GS6 for location.
Alley: Main to centerline shall be a minimum of three feet (3*) offset.B.
C.
D.
Private Street:Shall require special design and conditions. Easement shall be20 feet
Horizontal Curve: SDR 35, PVC pipe may be curved horizontally with thefollowing limitation:
City Engineer shall approve curvatures for larger diameter pipe.
,EST ORIGINAL
Page 3 of 12
EXPLANATION OF FORMULAS
1. EDU
Determined per the City of Carlsbad Engineering Standards, Edition 2004 to
be 1 EDU per Single Family Residence.
2. Average Daily Flow (ADF)
Determined to be 220 gal/day/EDU per the City of Carlsbad Engineering
Standards, Edition 2004.
3. Average Flow (Qavg)
EDU x ADF (Then convert to cfs)
4. Peak Factor
Determined to be 2.5 per the City of Carlsbad Engineering Standards, Edition
2004.
5. Peak Flow (Qpeak)
2.5 x Qavg
6. Calculations for Velocity & Depth of Flow Using CivilCad
4/1/2009 Page 1 of 1
Robertson Ranch PA 21 - Proposed Sewer Analysis
Pipe Reach
1
2
3
A.H. #'s
6 to 5
5 to 4
4 to 3
Units
53-68
41-52,69-80
37-40,81-84
Total EDU's
16
40
48
Qavg (cfs}
0.005
0.014
0.016
Qpeak (cfs)
0.014
0.034
0.041
Pipe Diam.
(in.)
8
8
8
Pipe Slope
(%)
1.00
1.06
0.84
Depth of flow (ft)
(n=0.011)
0.046
0.070
0.081
D/d
(n=0.011)
0.07
0.11
0.12
Pipe Velocity (fps)
(n=0.011)
1.33
1.74
1.7
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O'Day Consultants Inc.
2710 Loker Avenue West, Suite 100
Carlsbad, CA 92008
Tel: (760) 931-7700 Fax: (760) 931-8680
Inside Diameter
( 8.00 in.)
* *
it *
Water
* ( 0.97 in.)
( 0.081 ft.)
* *
* * I
* v
Circular Channel Section
Flowrate 0.041 CFS
Velocity 1.700 fps
Pipe Diameter 8.000 inches
Depth of Flow 0.971 inches
Depth of Flow 0.081 feet
Critical Depth 0.094 feet
Depth/Diameter (D/d) 0.121
Slope of Pipe 0.840 %
X-Sectional Area 0.024 sq. ft.
Wetted Perimeter 0.474 feet
AR*(2/3) 0.003
Mannings 'n' 0.011
Min. Fric. Slope, 8 inch
Pipe Flowing Full 0.001 %
O'Day Consultants Inc.
2710 Loker Avenue West, Suite 100
Carlsbad, CA 92008
Tel: (760) 931-7700 Fax: (760) 931-8680
Inside Diameter
( 8.00 in.)
*
* *
* *
Water
* ( 0.84 in.)
( 0.070 ft.)
*
*
*
Circular Channel Section
Flowrate 0.034 CFS
Velocity 1.739 fps
Pipe Diameter 8.000 inches
Depth of Flow 0.841 inches
Depth of Flow 0.070 feet
Critical Depth 0.087 feet
Depth/Diameter (D/d) 0.105
Slope of Pipe 1.060 %
X-Sectional Area 0.020 sq. ft.
Wetted Perimeter 0.440 feet
ARA(2/3) 0.002
Mannings 'n' 0.011
Min. Fric. Slope, 8 inch
Pipe Flowing Full 0.001 %
O'Day Consultants, Inc.
2710 Loker Avenue West, Suite 100
Carlsbad, CA 92008
Tel: 760-931-7700 Fax: 760-931-8680
t *******
*
*
*
*
Inside Diameter
( 8.00 in.)
Water
( 0.55 in.)
( 0.046 ft.)
Circular Channel Section
Flowrate 0.014 CFS
Velocity 1.329 fps
Pipe Diameter 8.000 inches
Depth of Flow 0.553 inches
Depth of Flow 0.046 feet
Critical Depth 0.046 feet
Depth/Diameter (D/d) 0.069
Slope of Pipe 1.000 %
X-Sectional Area 0.011 sq. ft.
Wetted Perimeter 0.355 feet
AR"(2/3) 0.001
Mannings 'n' 0.011
Min. Fric. Slope, 8 inch
Pipe Flowing Full 0.000 %