HomeMy WebLinkAboutCT 05-05; LA COSTA GREENS NGBHD 1.16; WATER SYSTEM ANALYSIS; 2006-10-26r ,
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DEXTER WILSON ENGINEERING, INC.
WATER • WASTEWATER • RECYCLED WATER
CONSULTING ENGINEERS
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2234 FARADAY AVENUE • CARLSBAD, CA 92008 • (760) 438-4422
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RECORD COpy
{lS:S-. 7-23 -015
Initial Date
WATER SYSTEM ANALYSIS
FOR LA COSTA GREENS
NEIGHBORHOOD 1.16
October 26, 2006
Prepared by:
RECEIVED
NOV 222006
ENGINEERING
DEPARTMENT
Dexter Wilson Engineering, Inc.
2234 Faraday Avenue
Carlsbad, CA 9208
(760) 438-4422
Job No: 509-060
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DEXTER WILSON ENGINEERING, INC.
October 26, 2006
Hunsaker & Associates
10179 Huennekens Street
Suite 200
San Diego, CA 92121-2973
Attention: David Blalock, Project Engineer
DEXTER S. WILSON, P.E.
ANDREW M. OVEN, P;E.
STEPHEN M. NIELSEN, P.E.
DIANE H. SHAUGHNESSY, P.E.
509-060
Subject: Water System Analysis for La Costa Greens Neighborhood 1.16
Introduction
This letter-report provides a water system analysis for Neighborhood 1.16 of the La
Costa Greens project. This report determines the required waterline sizes to meet
domestic and fire flow requirements for the proposed multifamily development and
identifies connections to the existing water system that will occur in the vicinity of
the project.
The portion of La Costa Greens covered by this study is located at the intersection
of Dove Lane and Estrella De Mar Road. The project proposes 86 attached
residential units and is divided into west and east areas by Estrella De Mar Road.
The location of the neighborhood analyzed in this study is identified on Figure 1.
2234 FARADAY AVENUE • CARLSBAD, CA 92008 • (760) 438-4422 • FAX (760) 438-0173
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I DOVE LANE
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A V1ARA PARKWAY ALGA ROAD
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I FIGURE 1
I SITE VICINITY MAP
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David Blalock
October 26, 2006
Neighborhood 1.16 of the La Costa Greens project is within the 318 Zone of the
Carlsbad Municipal Water District (CMWD) for water service. The 318 Zone is
formed by pressure reducing off higher zones in the area. There is a 375/318 Zone
pressure reducing station along Estrella De Mar Road to the north of the project
and a 550/318 Zone pressure reducing station west of the project.
The project will obtain water service by making connections to the existing 8-inch
318 Zone waterline in Dove Lane and the existing 8-inch 318 Zone waterline in
Estrella De Mar Road. Based on pad elevations ranging from 122 to 187 feet,
maximum static pressures for the project will range from 57 psi to. 85 psi. A few
pads, located at an elevation of 180 feet or higher, will narrowly miss the 60 psi
minimum static pressure criteria recommended per City of Carlsbad Engineering
Standards.
Projected Water Demand
To determine the average day water demand for the project, a water demand factor
of 250 gallons per day (gpd) per multi-family unit was used. This results in an
average day water demand of 21,500 gpd for the project.
To convert the average day water demand to a maximum day water demand and a
peak hour water demand, factors of 1.65 and 2.9 were used, respectively. This
results in a maximum day water demand of 35,475 gpd and a peak hour water
demand of 62,350 gpd for the project.
DEXTER WILSON ENGINEERING, INC. PAGE 3
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David Blalock
October 26, 2006
Proposed Water System
Exhibit A provides the proposed water system for Neighborhood 1.16 of the La
Costa Greens project. The project proposes to have an 8-inch public distribution
waterline installed within the development. This distribution line will supply the
proposed fire hydrants and serve as connection points for domestic water service.
The sizes of the building laterals and water meters were not determined for this
analysis and will be determined by others. It is recommended that the project be
supplied water by connecting to the existing 8-inch waterline in Estrella De Mar
Road and to the existing 8-inch waterline in Dove Lane.
Model Development. Analysis using the KYPIPE computer software developed
by the University of Kentucky determined residual pressures throughout the fire
protection system. This computer software utilizes the Hazen-Williams equation to
determine headloss in pipes. The Hazen-Williams "C" value used for all pipe. sizes
in our analysis is 120.
The fire protection system was modeled with an estimated hydraulic grade line of
300 feet at the existing 8-inch waterlines in Estrella De Mar Road and Dove Lane.
The fire protection system has been designed to provide a minimum residual
pressure greater than 20 psi under a fire flow scenario at all locations within the
proposed multi-family residential. A fire flow requirement of 3,000 gpm for
multifamily residential developments, obtained from the March 2003 Carlsbad
Water Master Plan Update, was used in the analysis. This fire flowrate was
modeled between two adjacent fire hydrant locations within the computer model
setup. Appendix A provides the computer modeling output and Exhibit A provides
the corresponding node and pipe diagram.
D~R WILSON ENGINEERING, INC. PAGE 4
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David Blalock
October 26, 2006
Thank you for the opportunity to assist you with the water system planning for this
project. If you have any questions regarding the contents of this report, please do
not hesitate to call.
Dexter Wilson Engineering, Inc.
Stephen M. Nielsen
SMN:sr
Attachments
DEXTER WILSON ENGINEERING, INC. PAGE 5
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APPENDIX A
COMPUTER OUTPUT
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The following conditions were modeled:
1. Average Day Demands
2. Maximum Day Demands plus Fire Flow Demand of 3,000 gpm
Split Between Nodes 52 and 56
3. Peak Hour Demands
I La Costa Greens Development Project No.: 509-060
I Fire Protection System Analysis File Name: 509060
September 8, 2006
FLOWRATE IS EXPRESSED IN GPM AND PRESSURE IN PSIG
I A SUMMARY OF THE ORIGINAL DATA FOLLOWS
I IScenario: Static Pressure Determination-No Fire Flow Demand!
I PIPE NO. NODE NOS. LENGTH DIAMETER ROUGHNESS MINOR LOSS K FIXED GRADE
(FEET) (INCHES)
1 0 4 162.0 8.0 120.0 .00 300.00
I 5 4 8 45.0 8.0 120.0 .00
9 8 12 110.0 8.0 120.0 .00
13 8 14 275.0 8.0 120.0 .00
17 14 16 155.0 8.0 120.0 .00
I 19 16 28 30.0 8.0 120.0 .00
21 4 20 125.0 8.0 120.0 .00
25 20 24 140.0 8.0 120.0 .00
,I 29 24 28 190.0 8.0 120.0 .00
33 28 32 51. 0 8.0 120.0 .00
37 32 36 35.0 8.0 120.0 .00
41 36 40 360.0 8.0 120.0 .00
I 45 40 44 410.0 8.0 120.0 .00
49 44 48 45.0 8.0 120.0 .00
51 0 48 160.0 8.0 120.0 .00 300.00
53 48 52 556.0 8.0 120.0 .00
I 57 52 56 243.0 8.0 120.0 .00
61 56 60 502.0 8.0 120.0 .00
I 65 60 64 212.0 8.0 120.0 .00
69 64 68 155.0 8.0 120.0 .00
73 68 72 100.0 8.0 120.0 .00
77 24 68 180.0 8.0 120.0 .00
I JUNCTION NUMBER DEMAND ELEVATION CONNECTING PIPES
I 4 .00 126.00 1 5 21
8 1. 66 126.00 5 9 13
12 1. 66 126.00 9
14 1. 66 127.00 13 17
I 16 1. 66 123.00 17 19
20 .00 127.00 21 25
24 .00 127.00 25 29 77
I 28 .00 124.00 19 29 33
32 .00 124.00 33 37
36 .00 124.00 37 41
40 .00 160.00 41 45
I 44 .00 165.00 45 49
48 .00 180.00 49 51 53
52 1. 66 185.00 53 57
56 1. 66 187.00 57 61
I 60 1. 66 150.00 61 65
64 1. 66 143.00 65 69
68 .00 141. 00 69 73 77
I 72 1. 66 138.00 73
I Dexter Wilson Engineering, Inc. Page 1 of7
I La Costa Greens Development Project No.: 509-060
I
Fire Protection System Analysis File Name: 5f,)9060
September 8, 2006
OUTPUT SELECTION: ALL RESULTS ARE OUTPUT EACH PERIOD
I 3 VALUES ARE OUTPUT FOR MAXIMUM AND MINIMUM PRESSURES
THIS SYSTEM HAS 22 PIPES WITH 19 JUNCTIONS, 2 LOOPS AND 2 FGNS
I. THE RESULTS ARE OBTAINED AFTER 10 TRIALS WITH AN ACCURACY = .00087
I PIPE NO. NODE NOS. FLOWRATE HEAD LOSS PUMP HEAD MINOR LOSS VELOCITY HL/I000
1 0 4 8.37 .00 .00 .00 .05 .00
5 4 8 5.28 .00 .00 .00 .03 .00 I 9 8 12 1. 66 .00 .00 .00 .01 .00
13 8 14 1. 96 .00 .00 .00 .01 .00
17 14 16 .30 .00 .00 .00 .00 .00
I 19 16 28 -1.36 .00 .00 .00 -,01 .00
21 4 20 3.09 .00 .00 .00 .02 .00
25 20 24 3.09 .00 .00 .00 .02 .00
29 24 28 -1.15 .00 .00 .00 -.01 .00
1 33 28 32 -2.51 .00 .00 .00 -.02 .00
37 32 36 -2.51 .00 .00 .00 -.02 .00
41 36 40 -2.51 .00 .00 .00 -.02 .00
1 45 40 44 -2.51 .00 .00 .00 -.02 .00
49 44 48 -2.51 .00 .00 .00 -.02 .00
51 0 48 6.57 .00 .00 .00 .04 .00
53 48 52 4.05 .00 .00 .00 .03 .00
I 57 52 56 2.39 .00 .00 .00 .02 .00
61 56 60 .73 .00 .00 .00 .00 .00
65 60 64 -.93 .00 .00 .00 -.01 .00
69 64 68 -2.59 .00 .00 .00 -.02 .00 1 73 68 72 1. 66 .00 .00' .00 .01 .00
77 24 68 4.25 .00 .00 .00 .. 03 .00
I JUNCTION NUMBER DEMAND GRADE LINE ELEVATION PRESSURE
4 .00 300.00 126.00 75.40
8 1. 66 300.00 126.00 75.40
I 12 1. 66 300.00 126.00 75.40
14 1. 66 300.00 127.00 74.97
16 1. 66 300.00 123.00 76.70
I 20 .00 300.00 127.00 74.97
24 .00 300.00 127.00 74.97
28 .00 300.00 124.00 76.27
32 .00 300.00 124.00 76.27
I 36 .00 300.00 124.00 76.27
40 .00 300.00 160.00 60.67
44 .00 300.00 165.00 58.50-
I 48 .00 300.00 180.00 52.00-
52 1. 66 300.00 185.00 49.83-
56 1. 66 300.00 187.00 48.97-
60 1. 66 300.00 150.00 65.00
I 64 1. 66 300.00 143.00 68.03
68 .00 300.00 141.00 68.90
72 1. 66 300.00 138.00 70.20
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J Dexter Wilson Engineering, Inc. Page 2 of7
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La Costa Greens Development
Fire Protection System Analysis
MAXIMUM PRESSURES
16 1. 66 300.00
36 .00 300.00
32 .00 300.00
MINIMUM PRESSURES
56 1. 66 300.00
52 1. 66 300.00
48 .00 300.00
THE NET SYSTEM DEMAND = 14.94
123.00
124.00
124.00
187.00
185.00
180.00
Project No.: 509-060
File Name: 509060
September 8, 2006
76.70
76.27
76.27
48.97
49.83
52.00
SUMMARY OF INFLOWS (+) AND OUTFLOWS (-) FROM FIXED GRADE NODES
PIPE NUMBER
1
51
FLOWRATE
8.37
6.57
THE NET FLOW INTO THE SYSTEM FROM FIXED GRADE NODES = 14.94
THE NET FLOW OUT OF THE SYSTEM INTO FIXED GRADE NODES = .00
Dexter Wilson Engineering, Inc. Page 3 of7
I La Costa Greens Development Project No.: 509-060
Fire Protection System Analysis File Name: 509060
I September 8, 2006
A SUMMARY OF CONDITIONS SPECIFIED FOR THE NEXT SIMULATION FOLLOWS
I THE DEMANDS ARE CHANGED FROM ORIGINAL VALUES BY A FACTOR 1. 65
I THE FOLLOWING SPECIFIC DEMAND CHANGES ARE MADE:
JUNCTION NUMBER DEMAND
52 1501.66
56 1501.66
I THE RESULTS ARE OBTAINED AFTER 4 TRIALS WITH AN ACCURACY .00168
I Scenario: Fire Flow Demand of 3,000 gpm Plus Max Day Demand Split Between Nodes
52 and 56
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I PIPE NO. NODE NOS. FLOWRATE HEAD LOSS PUMP HEAD MINOR LOSS VELOCITY HL/1000
1 0 4 1330.11 5.82 .00 .00 8.49 35.93
5 4 8 511.69 .28 .00 .00 3.27 6.13
9 8 12 2.74 .00 .00 .00 .02 .00
I 13 8 14 506.21 1. 65 .00 .00 3.23 6.00
17 14 16 503.47 .92 .00 .00 3.21 5.94
19 16 28 500.74 .18 .00 .00 3.20 5.89
21 4 20 818.42 1. 83 .00 .00 5.22 14.62
I 2-5 20 24 818.42 2.05 .00 .00 5.22 14.62
29 . 24 28 -431.55 -.85 .00 .00 -2.75 -4.47
33 28 32 69.18 .01 .00 .00 .44 .15
I 37 32 36 69.18 .01 .00 .00 .44 .15
41 36 40 69.18 .05 .00 .00 .44 .15
45 40 44 69.18 .06 .00 .00 .44 .15
49 44 48 69.18 .01 .00 .00 .44 .15
I 51 0 48 1692.38 8.98 .00 .00 10.80 56.14
53 48 52 1761.56 33.62 .00 .00 11.24 60.46
57 52 56 259.90 .42 .00 .00 1. 66 1. 75
I 61 56 60 -1241. 76 -15.88 .00 .00 -7.93 -31. 64
65 60 64 -1244.50 -6.73 .00 .00 -7.94 -31. 77
69 64 68 -1247.24 -4.94 .00 .00 -7.96 -31.90
73 68 72 2.74 .00 .00 .00 .02 .00
I 77 24 68 1249.98 5.77 .00 .00 7.98 32.03
JUNCTION NUMBER DEMAND GRADE LINE ELEVATION PRESSURE I 4 .00 294.18 126.00 72.88
8 2.74 293.90 126.00 72.76
12 2.74 293.90 126.00 72.76
I 14 2.74 292.25 127.00 71. 61
16 2.74 291.33 123.00 72.94
20 .00 292.35 127.00 71. 65
24 .00 290.30 127.00 70.77
I 28 .00 291.15 124.00 72.43
32 .00 291.15 124.00 72.43
36 .00 291.14 124.00 72.43
I 40 .00 291. 09 160.00 56.80
I Dexter Wilson Engineering, Inc. Page 4 of7
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La Costa Greens Development Project No.: 509-060
Fire Protection System Analysis File Name: 509060
September 8, 2006
44 .00 291.02 165.00 54.61
48 .00 291. 02 180.00 48.11
52 1501.66 257.40 185.00 31.37
56 1501.66 256.98 187.00 30.32
60 2.74 272.86 150.00 53.24
64 2.74 279.60 143.00 59.19
68 .00 284.54 141. 00 62.20
72 2.74 284.54 138.00 63.50
MAXIMUM PRESSURES
16 2.74 291. 33 123.00 72.94
4 .00 294.18 126.00 72.88
8 2.74 293.90 126.00 72.76
MINIMUM PRESSURES
56 1501.66 256.98 187.00 30.32
52 1501.66 257.40 185.00 31. 37
48 .00 291. 02 180.00 48.11
THE NET SYSTEM DEMAND = 3022.49
SUMMARY OF INFLOWS (+) AND OUTFLOWS (-) FROM FIXED GRADE NODES
PIPE NUMBER FLOWRATE
1 1330.11
51 1692.38
THE NET FLOW INTO THE SYSTEM FROM FIXED GRADE NODES = 3022.49
THE NET FLOW OUT OF THE SYSTEM INTO FIXED GRADE NODES .00
Dexter Wilson Engineering, Inc. Page 5 of7
I La Costa Greens Development Project No.: 509-060
Fire Protection System Analysis File Name: 509060 I September 8, 2006
A SUMMARY OF CONDITIONS SPECIFIED FOR THE NEXT SIMULATION FOLLOWS
I THE DEMANDS ARE CHANGED FROM ORIGINAL VALUES BY A FACTOR = 2.90
I THE RESULTS ARE OBTAINED AFTER 4 TRIALS WITH AN ACCURACY = .00026
Iscenario: Peak Hour Deman~
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PIPE NO. NODE NOS. FLOWRATE HEAD LOSS PUMP HEAD MINOR LOSS VELOCITY HL/1OOO
I 1 0 4 24.28 .00 .00 .00 .15 .0,2
5 4 8 15.31 .00 .00 .00 .10 .01
9 8 12 4.81 .00 .00 .00 .03 .00
13 8 14 5.68 .00 .00 .00 .04 .00
I 17 14 16 .87 .00 .00 .00 .01 .00
19 16 28 -3.95 .00 .00 .00 -.03 .00
21 4 20 8.97 .00 .00 .00 .06 .00
25 20 24 8.97 .00 .00 .00 .06 .00 I 29 24 28 -3.35 .00 .00 .00 -.02 .00
33 28 32 -7.29 .00 .00 .00 -.05 .00
37 32 36 -7.29 .00 .00 .00 -.05 .00
I 41 36 40 -7.29 .00 .00 .00 -.05 .00
45 40 44 -7.29 .00 .00 .00 -.05 .00
49 44 48 -7.29 .00 .00 .00 -.05 .00
51 0 48 19.04 .00 .00 .00 .12 .01
I 53 48 52 11.75 .00 .00 .00 .08 .01
57 52 56 6.94 .00 .00 .00 .04 .00
61 56 60 2.12 .00 .00 .00 .01 .00
I 65 60 64 -2.69 .00 .00 .00 -.02 .00
69 64 68 -7.50 .00 .00 .00 -.05 .00
73 68 72 4.81 .00 .00 .00 .03 .00
77 24 68 12.32 .00 .00 .00 .08 .01
I JUNCTION NUMBER DEMAND GRADE LINE ELEVATION PRESSURE
4 .00 300.00 126.00 75.40
8 4.81 300.00 126.00 75.40 I 12 4.81 300.00 126.00 75.40
14 4.81 300.00 127.00 74.96
16 4.81 300.00 123.00 76.70
I 20 .00 300.00 127.00 74.96
24 .00 300.00 127.00 74.96
28 .00 300.00 124.00 76.26
32 .00 300.00 124.00 76.26 I 36 .00 300.00 124.00 76.26
40 .00 300.00 160.00 60.67
44 .00 300.00 165.00 58.50
I 48 .00 300.00 180.00 52.00
52 4.81 299.99 185.00 49.83
56 4.81 299.99 187.00 48.96
60 4.81 299.99 150.00 65.00
I 64 4.81 299.99 143.00 68.03
68 .00 299.99 141.00 68.90
72 4.81 299.99 138.00 70.20
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I Dexter Wilson Engineering, Inc. Page 6 of7
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La Costa Greens Development
Fire Protection System Analysis
MAXIMUM PRESSURES
16 4.81 300.00
36 .00 300.00
32 .00 300.00
MINIMUM PRESSURES
56 4.81 299.99
52 4.81 299.99
48 .00 300.00
THE NET SYSTEM DEMAND = 43.33
123.00
124.00
124.00
187.00
185.00
180.00
Project No.: 509-060
File Name: 509060
September 8, 2006
76.70
76.26
76.26
48.96
49.83
52.00
SUMMARY OF INFLOWS (+) AND OUTFLOWS (-) FROM FIXED GRADE NODES
PIPE NUMBER
1
51
FLOWRATE
24.28
19.04
THE NET FLOW INTO THE SYSTEM FROM FIXED GRADE NODES =
THE NET FLOW OUT OF THE SYSTEM INTO FIXED GRADE NODES
Dexter Wilson Engineering, Inc.
43.33
.00
Page 7 of7
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SCALE: 1" = 1 00'
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./ PROJECT
,/ BOUNDARY
\ \PACIFIC\DWG\509060\EXHIBIT-A.DWG 09-08-06 14:09: 25 LAYOUT: EXHIBIT
--
----------.,.,
LEGEND
--PROJECT BOUNDARY
-. --'-- - - - - -EXISTING WATER LINE
-......-----PROPOSED WATER LINE
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~ FIRE HYDRANT
® COMPUTER MODEL NODE
m COMPUTER MODEL PIPE
EXHIBI:TA
LA COSTA GREENS
NEIGHBORHOOD 1.16
NODE AND PIPE DIAGRAM