HomeMy WebLinkAboutPA2023-0040_20230214_Water Availability Study dated 01-06-23Assessment of Water Availability for
Proposed Residential Development
FOR
1401 Quail Street
Newport Beach, CA 92660
Prepared By:
Adams-Streeter Civil Engineers, Inc.
16755 Von Karman Avenue, Suite 150, Irvine CA 92606
(949) 474-2330
January 6, 2022
TABLE OF CONTENTS
I. Introduction
II. Existing Conditions Analysis
III. Proposed Conditions Analysis
IV. Capacity Assessment and Conclusion
APPENDICES
A. Fire Hydrant Flow Test
B. WaterCAD Model and Results
1
I. INTRODUCTION:
The subject site is currently occupied by an office building on a 1.71-acre lot located at
the north-west corner of Quail Street and Spruce Avenue with a land use classification
of “General Commercial - Office”. The proposed site will have a land use classification
of “Very High Residential”. The proposed site is anticipated to result in an increased
local water demand and utilizes an existing 16” water main on Spruce St. for domestic
water service. The purpose of this study is to determine the adequacy of the existing
facilities to serve the proposed residential development. It is not meant to be a Water
Supply Assessment under California SB610/SB221.
II. EXISTING CONDITIONS ANALYSIS
The existing facility is currently served by a fire water service and a second domestic
water service, both of which connect to a 16” main located on Spruce St. Existing peak
flows have been calculated based on section 4.4 “Land Use Demand Factors” of the
City of Newport Beach Water Master Plan (WMP) based on the land use classification
of “General Commercial - Office”. Based on the WMP, average demand for the site is
calculated as follows.
1.71 Acres x 2,000 GPD/acre = 3420 GPD or 2.38 GPM
Per City WMP, a peaking factor of 2.6 is required to calculate peak hour demand.
However, in order to provide a factor of safety, a peaking factor of 3.0 has been used for
the purpose of calculating peak flow rates. Peak flow calculations are as follows:
2.38 GPM x 3.00 = 7.14 GPM of domestic water at peak demand
2
For this analysis, existing flow and pressure at the site were determined from a fire
hydrant flow test conducted by the City of Newport Beach Utilities Department on
11/22/2022 (See Appendix A). The Fire hydrant tested (FH#B17) is located on Spruce
Street, approximately 230 feet away in the south-westerly direction from the project site.
The findings of this flow test were then used to create a model of the domestic water
pipe network in the immediate vicinity of the site using WaterCAD by Bentley Systems,
Inc.
The following parcels on Quail Street and Spruce Street were considered in the water
model. The land use is a combination of “Mixed-Use” and “General Commercial –
Office” parcels. It was assumed that the 16” water main on Spruce street as well as the
16” & 8” water mains on Quail Street are servicing the existing parcels near the project
site.
The same methodology that was used to gather the peak flow demand of the project
site is used to find the peak flow demand of the other parcels. Please refer to the GIS
map and the table below for clarification:
3
Land Use Area
(acre) GPD/Area GPD GPM
GPM x
Safety
Factor of
3
Project
Site General Commercial Office 1.710 2,000 3,420 2.38 7.14
Parcel #1 Mixed-use 1.151 2,200 2,532 1.76 5.28
Parcel #2 Mixed-use 1.000 2,200 2,200 1.53 4.58
Parcel #3 Mixed-use 1.506 2,200 3,313 2.30 6.90
Parcel #4 Mixed-use 1.472 2,200 3,238 2.25 6.75
Parcel #5 Mixed-use 3.700 2,200 8,140 5.65 16.96
Parcel #6* Very High Residential 1.970 3,800 7,486 5.20 15.60
Parcel #7 General Commercial Office 1.415 2,000 2,830 1.97 5.90
Parcel #8 General Commercial Office 2.215 2,000 4,430 3.08 9.23
Parcel #9 General Commercial Office 4.775 2,000 9,550 6.63 19.90
Parcel #10 General Commercial Office 2.376 2,000 4,752 3.30 9.90
Total - 23.290 - 51,892 36.04 108.13
*Land use for Parcel #6 has been changed to Very High Residential to reflect actual future
condition per Water Study Report prepared by Tait and Associates, December 2021.
III. PROPOSED CONDITIONS ANALYSIS
The site will be developed to have a categorized land use of “Very High Residential”.
The proposed development will utilize a new domestic water, fire water, and irrigation
water service laterals with a connection to the 16” water main on Spruce Street.
Proposed peak flows have been calculated based on section 4.4 “Land Use Demand
Factors” of the City of Newport Beach Water Master Plan (WMP) based on the noted
land use “Very High Residential”. Based on the WMP, average demand for the site is
calculated as follows:
1.71 acres x 3,800 GPD/acre = 6,498 or 4.51 GPM
4
Peak flow calculations are as follows:
4.51 GPM x 3.00 = 13.53 GPM of domestic water at peak demand
The peak demand for the proposed site would be 13.53 GPM which is 6.40 GPM higher
than the existing condition.
The tables below depict the junction and pipe line serving the project site in both the
existing and proposed condition. The full results of the model can be found in Appendix
B.
EXISTING JUNCTION DATA
Label Elevation
(ft)
Demand
(gpm)
Hydraulic
Grade (ft)
Pressure
(psi)
PROJECT
SITE 41.5 7 273.6 100
PROPOSED JUNCTION DATA
Label Elevation
(ft)
Demand
(gpm)
Hydraulic
Grade (ft)
Pressure
(psi)
PROJECT
SITE 41.5 14 273.57 100
EXISTING PIPE DATA
Label Length (Scaled)
(ft)
Diameter
(in) Material Hazen-Williams C Flow
(gpm)
Velocity
(ft/s)
Headloss
Gradient
(ft/ft)
L-P 23 6 Asbestos
Cement 140 7 0.08 0
PROPOSED PIPE DATA
Label Length (Scaled)
(ft)
Diameter
(in) Material Hazen-Williams C Flow
(gpm)
Velocity
(ft/s)
Headloss
Gradient
(ft/ft)
L-P 23 6 Asbestos
Cement 140 14 0.16 0
5
IV. CAPACITY ASSESMENT AND CONCLUSION
An analysis of the existing conditions for both domestic water mains on Spruce Street
and Quail Street resulted in velocity changes less than 0.08 FT/S and a pressure
change of less than 1 PSI for domestic water usages which can be considered
negligible. Therefore, it has been determined the existing public water system at the
project site is more than adequate to handle the increased demand of the proposed
residential development and will not adversely affect the existing network’s ability to
serve the surrounding developments.
6
Appendix A: Fire Hydrant Flow Test
CITY OF NEWPORT BEACH
UTILITIES DEPARTMENT
FIRE HYDRANT FLOW TEST
AMOUNT PAID:$458.00 DATE:11/22/2022
CHECK NO:TIME:6:00AM
TEST NO:WEATHER:CLEAR
PROJECT:
PROJECT LOCATION:SPRUCE AVENUE
TEST CONDUCTED FOR:Nick Streeter
TEST PERFORMED BY:O'CAMPO/ AUGER
TEST WITNESSED BY:
FIELD OBSERVATIONS AND FLOW DATA
STATIC HYDRANT # : 817 LOCATION: 3661 Spruce
F/H MANUFACTURER: AVK NUMBER & SIZE OF OUTLETS: 2-2.5" 1-4"
STATIC PRESSURE, ( Ps , psi), PRE-FLOW:98
RESIDUAL PRESSURE, (Pr , psi) FLOWING:85
FLOW HYDRANT # : 818 LOCATION: 1400 Bristol
F/H MANUFACTURER:AVK NUMBER & SIZE OF OUTLETS:2-2.5" 1-4"
STATIC PRESSURE, PRE-FLOW (INFO ONLY, NOT FOR TEST CALCS) :
F/H OUTLET SIZE ( 2.5 or 4.0):2.5 (d, inches)
FLOW LOSS COEFFICIENT - TUBE C=1.0 / BUTT C=0.9 0.9
PITOT GAUGE READING ( p, psi ):67
OBSERVED FLOW: THE OBSERVED FLOW FROM A HYDRANT OUTLET IS CALCULATED FROM THE
FOLLOWING EQUATION:
WHERE; Q IS THE OBSERVED FLOW IN GPM; d IS THE OUTLET DIAMETER IN INCHES; p IS THE PITOT GAUGE
PRESSURE IN PSI; AND C IS THE FLOW LOSS COEFFICIENT ( C = 1.0 FOR FLOW TUBES AND C = 0.9 FOR BUTT
FLOW READINGS ).
OBSERVED FLOW (Qs, gpm):1373 GPM
DISCHARGE CALCS: THE DISCHARGE FOR A GIVEN FIRE HYDRANT CAN BE DETERMINED FROM THE FOLLOWING
EQUATION USING THE INITIAL ( STATIC ) WATER PRESSURE AND THE RESIDUAL ( DYNAMIC )
WATER PRESSURE:
WHERE; Q ( STATIC OR RESIDUAL ) IS THE FLOW IN GPM; AND P ( STATIC OR RESIDUAL ) IS THE
PRESSURE IN PSI. NOTE: A 10 PSI DROP IS REQUIRED FOR VALID TEST!
CALCULATED FLOW AT 20 psi (Qr, gpm):3614 GPM
Q s =29.83 Cd 2()p2
Q r =Q s
Ps -20
Ps -Pr
æçè
ö÷ø
0.54
7
Appendix B: WaterCAD Model and Results
FlexTable: Junction Table
Pressure
(psi)
Hydraulic
Grade
(ft)
Demand
(gpm)
Elevation
(ft)
Label
111294.37538.50J-1
111294.37537.50J-2
111294.37738.50J-3
110294.37739.50J-4
109294.361741.50J-5
109294.37741.50J-6
110294.35639.50J-7
110294.35940.50J-8
110294.352039.50J-9
106294.371048.50J-10
107294.37947.30PROJECT SITE
Page 1 of 127 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA +1-203-755-1666
12/1/2021
WaterCAD
[10.03.00.69]
Bentley Systems, Inc. Haestad Methods Solution
CenterSP8772 - WATER MODEL STUDY.wtg
Water Analysis for Existing Conditions
Label Elevation (ft)
Demand
(gpm)
Hydraulic Grade
(ft)Pressure (psi)
J-1 38.5 5 273.6 102
J-2 37.5 5 273.6 102
J-3 38.5 7 273.6 102
J-4 39.5 7 273.6 101
J-5 40.5 0 273.6 101
J-5 41.5 17 273.6 100
J-6 47.3 16 273.6 98
J-7 39.5 6 273.6 101
J-8 40.5 9 273.6 101
J-9 39.5 20 273.6 101
J-10 48.5 10 273.6 97
PROJECT SITE 41.5 7 273.6 100
Label Elevation (ft)Demand
(gpm)
Hydraulic Grade
(ft)Pressure (psi)
J-1 38.5 5 273.6 102
J-2 37.5 5 273.6 102
J-3 38.5 7 273.6 102
J-4 39.5 7 273.6 101
J-5 41.5 17 273.6 100
J-6 47.3 16 273.6 98
J-7 39.5 6 273.6 101
J-8 40.5 9 273.6 101
J-9 39.5 20 273.6 101
J-10 48.5 10 273.6 97
PROJECT SITE 41.5 7 273.6 100
FlexTable: Pipe Table
Headloss
Gradient
(ft/ft)
Velocity
(ft/s)
Flow
(gpm)
Hazen-
Williams C
MaterialDiameter
(in)
Length
(Scaled)
(ft)
Label
0.0000.02102140.0Asbestos Cement48.01P-1
0.0000.16102140.0Asbestos Cement16.017P-2
0.0000.1383140.0Asbestos Cement16.046P-3
0.0000.0959140.0Asbestos Cement16.0233P-4
0.0000.0424140.0Asbestos Cement16.012P-5
0.0000.015140.0Asbestos Cement16.0142P-7
0.0000.000140.0Asbestos Cement16.0141P-8
0.0000.065140.0Asbestos Cement6.052P-9
0.0000.055140.0Asbestos Cement6.052P-10
0.0000.0317140.0Asbestos Cement16.0115P-6(1)
0.0000.0210140.0Asbestos Cement16.0189P-6(2)
0.0000.087140.0Asbestos Cement6.052P-11
0.0000.087140.0Asbestos Cement6.052P-12
0.0000.2235140.0Asbestos Cement8.0324P-13
0.0000.069140.0Asbestos Cement8.0143P-14
0.0000.000140.0Asbestos Cement8.0137P-15
0.0000.109140.0Asbestos Cement6.017P-16
0.0000.2320140.0Asbestos Cement6.051P-17
0.0000.076140.0Asbestos Cement6.017P-18
0.0000.087140.0Asbestos Cement6.027P-19
0.0000.1917140.0Asbestos Cement6.068P-20
0.0000.0319140.0Asbestos Cement16.025P-21
0.0000.0319140.0Asbestos Cement16.0161P-22
0.0000.1110140.0Asbestos Cement6.028P-24
0.0000.019140.0Asbestos Cement16.08P-32
0.0000.000140.0Asbestos Cement16.0120P-33
0.0000.109140.0Asbestos Cement6.075P-35
Page 1 of 127 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA +1-203-755-1666
12/1/2021
WaterCAD
[10.03.00.69]
Bentley Systems, Inc. Haestad Methods Solution
CenterSP8772 - WATER MODEL STUDY.wtg
FlexTable: Pump Table
Pump Head
(ft)
Flow (Total)
(gpm)
Hydraulic Grade
(Discharge)
(ft)
Hydraulic Grade
(Suction)
(ft)
Elevation
(ft)
Label
242.37102294.3752.0052.10PMP-1
Label Length (Scaled)
(ft)
Diameter
(in)Material Hazen-Williams C
Flow
(gpm)Velocity (ft/s)Headloss Gradient
(ft/ft)
L-1 57 6 Asbestos Cement 140 5 0.06 0
L-2 58 6 Asbestos Cement 140 5 0.06 0
L-3 57 6 Asbestos Cement 140 7 0.08 0
L-4 57 6 Asbestos Cement 140 7 0.08 0
L-5 80 6 Asbestos Cement 140 17 0.19 0
L-6 77 6 Asbestos Cement 140 16 0.18 0
L-7 26 6 Asbestos Cement 140 6 0.07 0
L-8 34 6 Asbestos Cement 140 9 0.1 0
L-9 57 6 Asbestos Cement 140 20 0.23 0
L-10 23 6 Asbestos Cement 140 10 0.11 0
L-P 23 6 Asbestos Cement 140 7 0.08 0
MP-1 4 48 Asbestos Cement 140 109 0.02 0
MP-2 77 16 Asbestos Cement 140 109 0.17 0
MP-3 30 16 Asbestos Cement 140 93 0.15 0
MP-4 182 16 Asbestos Cement 140 83 0.13 0
MP-5 36 16 Asbestos Cement 140 76 0.12 0
MP-6 224 16 Asbestos Cement 140 59 0.09 0
MP-7 17 16 Asbestos Cement 140 24 0.04 0
MP-8 120 16 Asbestos Cement 140 17 0.03 0
MP-9 204 16 Asbestos Cement 140 10 0.02 0
MP-10 128 16 Asbestos Cement 140 5 0.01 0
MP-11 140 16 Asbestos Cement 140 0 0 0
MP-12 268 16 Asbestos Cement 140 35 0.06 0
MP-13 188 16 Asbestos Cement 140 9 0.01 0
MP-14 148 16 Asbestos Cement 140 0 0 0
Label Elevation
(ft)
Hydraulic Grade
(Suction) (ft)
Hydraulic Grade
(Discharge) (ft)
Flow (Total)
(gpm)Pump Head (ft)
PMP-1 52.1 47.5 273.6 109 226.1
FlexTable: Junction Table
Pressure
(psi)
Hydraulic
Grade
(ft)
Demand
(gpm)
Elevation
(ft)
Label
111294.34538.50J-1
111294.34537.50J-2
111294.34738.50J-3
110294.34739.50J-4
109294.341741.50J-5
109294.34741.50J-6
110294.33639.50J-7
110294.33940.50J-8
110294.332039.50J-9
106294.341048.50J-10
107294.341647.30PROJECT SITE
Page 1 of 127 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA +1-203-755-1666
12/1/2021
WaterCAD
[10.03.00.69]
Bentley Systems, Inc. Haestad Methods Solution
CenterSP8772 - WATER MODEL STUDY.wtg
Water Analysis for Proposed Conditions
Label Elevation (ft)
Demand
(gpm)
Hydraulic Grade
(ft)Pressure (psi)
J-1 38.5 5 273.57 102
J-2 37.5 5 273.57 102
J-3 38.5 7 273.57 102
J-4 39.5 7 273.57 101
J-5 40.5 0 273.57 101
J-5 41.5 17 273.57 100
J-6 47.3 16 273.57 98
J-7 39.5 6 273.57 101
J-8 40.5 9 273.57 101
J-9 39.5 20 273.56 101
J-10 48.5 10 273.57 97
PROJECT SITE 41.5 14 273.57 100
Label Elevation (ft)Demand
(gpm)
Hydraulic Grade
(ft)Pressure (psi)
J-1 38.5 5 273.57 102
J-2 37.5 5 273.57 102
J-3 38.5 7 273.57 102
J-4 39.5 7 273.57 101
J-5 41.5 17 273.57 100
J-6 47.3 16 273.57 98
J-7 39.5 6 273.57 101
J-8 40.5 9 273.57 101
J-9 39.5 20 273.56 101
J-10 48.5 10 273.57 97
PROJECT SITE 41.5 14 273.57 100
FlexTable: Pipe Table
Headloss
Gradient
(ft/ft)
Velocity
(ft/s)
Flow
(gpm)
Hazen-
Williams C
MaterialDiameter
(in)
Length
(Scaled)
(ft)
Label
0.0000.02108140.0Asbestos Cement48.01P-1
0.0000.17108140.0Asbestos Cement16.017P-2
0.0000.1383140.0Asbestos Cement16.046P-3
0.0000.0959140.0Asbestos Cement16.0233P-4
0.0000.0424140.0Asbestos Cement16.012P-5
0.0000.015140.0Asbestos Cement16.0142P-7
0.0000.000140.0Asbestos Cement16.0141P-8
0.0000.065140.0Asbestos Cement6.052P-9
0.0000.055140.0Asbestos Cement6.052P-10
0.0000.0317140.0Asbestos Cement16.0115P-6(1)
0.0000.0210140.0Asbestos Cement16.0189P-6(2)
0.0000.087140.0Asbestos Cement6.052P-11
0.0000.087140.0Asbestos Cement6.052P-12
0.0000.2235140.0Asbestos Cement8.0324P-13
0.0000.069140.0Asbestos Cement8.0143P-14
0.0000.000140.0Asbestos Cement8.0137P-15
0.0000.109140.0Asbestos Cement6.017P-16
0.0000.2320140.0Asbestos Cement6.051P-17
0.0000.076140.0Asbestos Cement6.017P-18
0.0000.087140.0Asbestos Cement6.027P-19
0.0000.1917140.0Asbestos Cement6.068P-20
0.0000.0426140.0Asbestos Cement16.025P-21
0.0000.0426140.0Asbestos Cement16.0161P-22
0.0000.1110140.0Asbestos Cement6.028P-24
0.0000.0216140.0Asbestos Cement16.08P-32
0.0000.000140.0Asbestos Cement16.0120P-33
0.0000.1816140.0Asbestos Cement6.075P-35
Page 1 of 127 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA +1-203-755-1666
12/1/2021
WaterCAD
[10.03.00.69]
Bentley Systems, Inc. Haestad Methods Solution
CenterSP8772 - WATER MODEL STUDY.wtg
FlexTable: Pump Table
Pump Head
(ft)
Flow (Total)
(gpm)
Hydraulic Grade
(Discharge)
(ft)
Hydraulic Grade
(Suction)
(ft)
Elevation
(ft)
Label
242.34108294.3452.0052.10PMP-1
Label Length (Scaled)
(ft)
Diameter
(in)Material Hazen-Williams C
Flow
(gpm)Velocity (ft/s)Headloss Gradient
(ft/ft)
L-1 57 6 Asbestos Cement 140 5 0.06 0
L-2 58 6 Asbestos Cement 140 5 0.06 0
L-3 57 6 Asbestos Cement 140 7 0.08 0
L-4 57 6 Asbestos Cement 140 7 0.08 0
L-5 80 6 Asbestos Cement 140 17 0.19 0
L-6 77 6 Asbestos Cement 140 16 0.18 0
L-7 26 6 Asbestos Cement 140 6 0.07 0
L-8 34 6 Asbestos Cement 140 9 0.1 0
L-9 57 6 Asbestos Cement 140 20 0.23 0
L-10 23 6 Asbestos Cement 140 10 0.11 0
L-P 23 6 Asbestos Cement 140 14 0.16 0
MP-1 4 48 Asbestos Cement 140 116 0.02 0
MP-2 77 16 Asbestos Cement 140 116 0.19 0
MP-3 30 16 Asbestos Cement 140 100 0.16 0
MP-4 182 16 Asbestos Cement 140 90 0.14 0
MP-5 36 16 Asbestos Cement 140 76 0.12 0
MP-6 224 16 Asbestos Cement 140 59 0.09 0
MP-7 17 16 Asbestos Cement 140 24 0.04 0
MP-8 120 16 Asbestos Cement 140 17 0.03 0
MP-9 204 16 Asbestos Cement 140 10 0.02 0
MP-10 128 16 Asbestos Cement 140 5 0.01 0
MP-11 140 16 Asbestos Cement 140 0 0 0
MP-12 268 16 Asbestos Cement 140 35 0.06 0
MP-13 188 16 Asbestos Cement 140 9 0.01 0
MP-14 148 16 Asbestos Cement 140 0 0 0
Label Elevation
(ft)
Hydraulic Grade
(Suction) (ft)
Hydraulic Grade
(Discharge) (ft)
Flow (Total)
(gpm)Pump Head (ft)
PMP-1 52.1 47.5 273.57 116 226.07
Scenario: Base
M
P-8
L-4
M P-1
L-8
M
P-7
L-5
M P-6
M P-5
MP-13
L-9
L-P
L-7
M P-4
M
P-12
L-10
L-1
M P-3
M
P-10
L-6
M
P-11
M P-2
M
P-9
L-2
M
P-1
4
L-3
END
T-3
T-M
J-4
T-4
J-5
J-8
T-5
J-9
PROJECT SITE
J-7
T-P
J-24
J-10
J-1
T-10
T-1
J-6
T-6
T-2
J-2
J-3
END
J-5
PMP-1
R-1
Page 1 of 176 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-
1666
12/14/2022
WaterCAD
[10.03.05.05]Bentley Systems, Inc. Haestad Methods Solution Center22-2434-Water Study.wtg
WaterCAD Model