HomeMy WebLinkAboutCT 97-02; Rancho Carrillo Villages A, B, C and D; Rancho Carrillo A B C D; 1998-02-02SEWER STUDY
FOR
RANCHO CARRILLO
VILLAGES A, B, C & D
CITY OF CARLSBAD
JOB NO. 13111
AUGUST 28, 1997
REVISED FEBRUARY 2, 1998
Roger L. Bal R.C.E. 27678
Prepared By:
Rick Engineering Company
5620 Friars Road
San Diego, California 92110
(619)291-0707
TABLE OF CONTENTS
Introduction 1
Vicinity Map 2
Population and Design Criteria 3
Sewer Study Summary 4
Example Calculation Sheet 5
Map Pocket
Sewer Study Map
AN:kt.13111.002 2-2-98
INTRODUCTION
The purpose of this study is to provide a sewer system that will serve Rancho Carrillo
Villages A, B, C & D. This study will be used as a guideline for the preparation of the final
construction plans for this project.
The Rancho Carrillo Development is located west of El Camino Real Road between
Palomar Airport Road and Alga Road (see Vicinity Map on the following page). These
subdivisions will include 654 residential lots.
AN:kt.13111.002 I 2-2-98
CITY OF OCEANSIDE
HIGHWAY ?8
PROJECT LOCATION
CITY OF VISTA
CITY OF
SAN MARCOS
CITY OF ENCINITAS
VICINITY MAP
NOT TO SCALE
POPULATION AND DESIGN CRITERIA
Following is a list of criteria and assumptions that were used for the design of the sewer
system:
1. Flows are based on 220 gallons per dwelling units per day.
2. Maximum flow based on ratio - peak to average flow of 2.5 unless otherwise
approved by District Engineer, per CMWD Sewer System Design Criteria Standards
and Specifications, item number 4.d.2.
3. Minimum design grade is 0.4 percent, or the grade that will provide a cleansing
velocity of two feet per second at peak flow, whichever is greater.
4. Where the minimum velocity of two feet per second cannot be maintained, a
minimum slope of 1.0 percent shall be used (except in cases of excessive depth).
5. Sewer pipe material is to be polyvinyl chloride pipe with a Manning's "N" value of
0.011.
AN:kt.13111.002 3 2-2-98
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EXAMPLE CALCULATION
AH 2-1
Population Data
Initial Population = 459 Dwelling Units
Contributing Population = 195 Dwelling Units
Total Population = 654 Dwelling Units
654 D.U. x 220 Gal/Dav = 143,880 Gal/Day
D.U.
Total Average Daily Flow = 143,880 gallons
Q Average = 143,880 Gal x 1 = 0.223 CFS
Day 646,000
Peaking Factor = 2.5
Total Peak Flow (Q) = 2.5 x 0.223 = 0.557 CFS
Pipe Characteristics
n = 0.011
DIA = 8"
Q = 0.557 CFS
Smin = 1.0%
Velocity = 3.4 FPS
3.4 FPS * 2 FPS ....OK
dn/D = .48 < 0.50 ....OK
AN:kt.13111.002 5 2-2-98