HomeMy WebLinkAbout005 Water Report
North 3rd Apartments
Water Design Report
PREPARED FOR:
DEVCO, LLC
PO Box 4108, Bellevue, WA 98009
(425) 736-0580
NOVEMBER 2022
PREPARED BY:
1000 2nd Avenue, Suite 3900, Seattle, WA 98104
(206) 607-2600
NORTH 3RD APARTMENTS, LLC.
Water Design Report │ DEVCO North 3rd Apartments
November 2022
ii
TABLE OF CONTENTS
1. INTRODUCTION ............................................................................................................. 1
1.1. PROJECT BACKGROUND ............................................................................................ 1
1.2. PROJECT PURPOSE .................................................................................................... 1
2. SITE CONDITIONS ......................................................................................................... 3
2.1. GENERAL EXISTING SITE CONDITIONS ..................................................................... 3
2.2. EXISTING WATER INFRASTRUCTURE ........................................................................ 3
2.3. GENERAL PROPOSED SITE DESIGN .......................................................................... 3
3. WATER DEMAND PROJECTIONS ................................................................................ 5
3.1. DOMESTIC WATER DEMANDS .................................................................................... 5
3.2. FIRE FLOW DEMANDS ................................................................................................. 5
4. PROPOSED WATER INFRASTRUCTURE IMPROVEMENTS ....................................... 7
4.1. BASIS OF DESIGN ........................................................................................................ 7
4.2. PROPOSED WATER MAIN IMPROVEMENTS ............................................................... 7
4.3. FIRE FLOW ANALYSIS .................................................................................................. 9
5. SUMMARY .................................................................................................................... 10
FIGURES
FIGURE 1-1: VICINITY MAP .......................................................................................................2
FIGURE 4-1: PROPOSED WATER IMPROVEMENTS ...............................................................8
TABLES
TABLE 2-1: PROPOSED DEVELOPMENT SUMMARY ..............................................................4
TABLE 3-1: DOMESTIC WATER DEMAND SUMMARY .............................................................5
TABLE 3-2: NFF SUMMARY ......................................................................................................6
TABLE 4-1: BASIS OF DESIGN - WATER IMPROVEMENTS ....................................................7
TABLE 4-2: WATERCAD FIRE FLOW ANALYSIS MODEL ASSUMPTIONS..............................9
TABLE 4-3: FIRE FLOW ANALYSIS RESULTS SUMMARY .......................................................9
APPENDICES
APPENDIX A – FEMA FLOOD INSURANCE RATE MAP .......................................................... A
APPENDIX B – CITY OF BOZEMAN FIRE FLOW DATA........................................................... B
APPENDIX C – FIRE FLOW MODELLING RESULTS ............................................................... C
Water Design Report │ DEVCO North 3rd Apartments
November 2022
1
1. INTRODUCTION
1.1. PROJECT BACKGROUND
The North 3rd Apartments Project proposes to develop 5.86 acres of two existing vacant lots (Parcel Nos.
RGG6409 & RGG6410) zoned as Residential Mixed-Use High-Density District (R-5) into a multi-family
apartment housing complex. The project site is located near 701 N 3rd Ave, Bozeman, MT in Gallatin
County. The project area is bounded to the north by the Homestead Townhouses Development, to the east
by single family residential housing, to the south by high density residential housing, and to the west by
Westlake Park. All 5.86 acres of the site will be disturbed. The proposed development includes seven (7)
garden style apartment buildings and a clubhouse available for use by all residents. The apartment
buildings are 4-story structures with 24-32 units per building, 216 units total. A vicinity map of the project
site is provided in Figure 1-1.
1.2. PROJECT PURPOSE
The project includes onsite and offsite water infrastructure improvements for the delivery of domestic water
and fire flow demand to the development from the existing City of Bozeman (City) drinking water system.
The purpose of this Water Design Report is to provide a description of the proposed water infrastructure
improvements and to demonstrate that the improvements meet the water distribution design requirements
included in the City Design Standards and Specifications Policy (Design Standards) and City Modifications
to Montana Public Works Standard Specifications (MPWSS) Sixth Edition.
Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan,Esri Japan, METI, Esri China (Hong Kong), Esri Korea, Esri (Thailand),NGCC, (c) OpenStreetMap contributors, and the GIS User Community
PROJECT SITE
FIGURE 1-1: VICINITY MAP
Water Design Report │ DEVCO North 3rd Apartments
November 2022
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2. SITE CONDITIONS
2.1. GENERAL EXISTING SITE CONDITIONS
The existing site is undeveloped land comprised primarily of grass and shrubs. There are no significant
topography changes on the site. The site generally slopes towards the northeast with a total of 12-feet of
elevation change. The surrounding land use is a mix of commercial, single-family residential, and multi-
family residential.
A geotechnical investigation was performed on the site in June 2022 by C & H Engineering and Surveying
Inc. Seven test pits were excavated for investigation. The test pits all generally showed organic silty clay
in the upper 1.5 to 2 feet, sandy lean clay to depths of 3.5 to 5 feet and poorly graded gravel with sand and
cobbles from 6.5 feet to the bottom of the test pit. The Natural Resources Conservation Service (NRCS)
Web Soil Survey (WSS) identifies the soil near the project site as 457A – Turner Loam.
The project site is not located within a FEMA Special Flood Hazard Area (SFHA). The site is mapped on
FEMA Flood Insurance Rate Map (FIRM) Panel 3000280816E, effective date April 21, 2021. The site lies
within an unshaded FEMA Zone X, area of minimal flood hazard. See the FIRM Panel in Appendix A.
2.2. EXISTING WATER INFRASTRUCTURE
The project is located in the City’s South Pressure Zone (South Zone). The South Zone is a pressure
reduced zone supplied by a water storage reservoir located at the water treatment plant on Sourdough
Road. The hydraulic grade line (HGL) of the zone is 5,125 ft. Pressures within the zone range from 6 pounds
per square inch (psi) to 160 psi with static pressures in the immediate vicinity of the project approximately
140 psi.
There are no water mains located in North 3rd Ave directly adjacent to the project; however, there are two
6-inch diameter stubs located near the northern boundary of Parcel No. RGG6409 in Ivan Dr. and North 3rd
Ave and an 8-inch diameter stub located near the southern boundary of Parcel No. RGG6410 in North 3rd
Ave. Water main located within a 0.25-mile radius of the project site is generally small diameter 4- or 6-inch
water main serving single family residential homes. West of the project there are 8- and 10-inch diameter
water mains located in Durston Road and North 7th Ave, respectively. All existing water mains in the area
are constructed of ductile iron pipe.
2.3. GENERAL PROPOSED SITE DESIGN
The proposed site will consist of seven (7) multifamily residential buildings and one clubhouse with laundry
facilities, fitness equipment and offices. Characteristics of each building are identified in Table 2-1.
Associated passenger vehicular parking and utility infrastructure will be constructed in conjunction with the
buildings.
Water Design Report │ DEVCO North 3rd Apartments
November 2022
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Table 2-1: Proposed Development Summary
Building Name No. Apartments Footprint (ft2) Estimated
Population
Building A 32 8,930 70
Building B 32 8,920 70
Building C 32 8,920 70
Building D 32 8,930 70
Building E 24 8,520 53
Building F 32 7,260 70
Building G 32 7,260 70
Clubhouse - 2,530 -
Total 216 - 473
Water Design Report │ DEVCO North 3rd Apartments
November 2022
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3. WATER DEMAND PROJECTIONS
Water demand projections for the proposed development were calculated to size onsite and offsite water
main improvements. The projections were made in accordance with the Design Standards Section V
Subsection A – Water Distribution Lines Design Criteria.
3.1. DOMESTIC WATER DEMANDS
Water demands for domestic water use were calculated based on an average day demand (ADD) of 170
gallons per capita per day (gpcd) and an occupancy rate of 2.17 people per dwelling unit in accordance
with the Design Standards and the 2017 Water Facility Plan update, respectively. The water demands for
the clubhouse were calculated by assuming an equivalent dwelling unit (EDU) demand based on an
equivalent square footage and safety factor of 1.5 to account for additional demand from the proposed
laundry facilities at the clubhouse. The total square footage of the apartment buildings is approximately
235,000 ft2 with 216 apartments (dwelling units); therefore, each dwelling unit is approximately 1,100 ft2.
Based on this approximation and a safety factor of 1.5 the clubhouse is equivalent to 4 EDUs.
Maximum day demand (MDD) and peak hour demand (PHD) were calculated using peaking factors of 2.3
and 3.0, respectively, per the Design Standards. The calculated domestic water demands for the
development are provided in Table 3-1.
Table 3-1: Domestic Water Demand Summary
Building
Name EDUs ADD MDD PHD
gpd gpm gpd gpm gpd gpm
Building A 32 11,900 9 27,370 20 35,700 25
Building B 32 11,900 9 27,370 20 35,700 25
Building C 32 11,900 9 27,370 20 35,700 25
Building D 32 11,900 9 27,370 20 35,700 25
Building E 24 9,100 7 20,930 15 27,300 19
Building F 32 11,900 9 27,370 20 35,700 25
Building G 32 11,900 9 27,370 20 35,700 25
Clubhouse 4 1,500 2 3,450 3 4,500 4
Total 220 82,000 63 188,600 138 246,000 173
3.2. FIRE FLOW DEMANDS
The fire flow demand or needed fire flow (NFF) for the proposed development was calculated using the
International Fire Code (IFC) Appendix B as recommended in Section 5.2.2 of the 2017 Water Facility Plan
Update. National Fire Protection Association (NFPA) 13R automatic sprinkler systems will be installed in
all seven apartment buildings; therefore, a 25 percent reduction of NFF was applied in accordance with IFC
Table B105.2. Additionally, a safety factor of 1.10 was applied to the IFC calculated NFF, per Section 5.5.4
of the 2017 Water Facility Plan Update.
IFC Table B105.1(2) was used to calculate the fire flow and fire duration prior to automatic sprinkler credit
and safety factors being applied. All buildings, including the clubhouse are construction type V-A. To
determine the “fire-flow calculation area” for each building it was assumed that building floors had the same
Water Design Report │ DEVCO North 3rd Apartments
November 2022
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area as the building footprint identified in Table 2-1. The calculated NFF for the proposed development is
identified in Table 3-2.
Table 3-2: NFF Summary
Building Name Fire-Flow Calculation
Area2 (ft2)
IFC Fire Flow
Requirement
(gpm)
IFC Fire Flow
Duration (hr)
Fire Flow
Demand3
(gpm)
Building A1 35,720 3,500 3 2,900
Building B1 35,680 3,500 3 2,900
Building C1 35,680 3,500 3 2,900
Building D1 35,720 3,500 3 2,900
Building E1 34,080 3,250 3 2,700
Building F1 29,040 3,000 3 2,500
Building G1 29,040 3,000 3 2,500
Clubhouse 2,530 1,500 2 1,700
City of Bozeman NFF 2900-gpm for 3 hours
Notes:
1. A 25% reduction of the IFC Fire Flow Requirements is allowed per IFC Table B105.2. A NFPA 13R automatic
sprinkler system will be installed in each apartment building.
2. Fire flow calculation area calculated as the total area of all floors of building (i.e. no. of floors * building
footprint).
3. Fire Flow Demand is calculated with a 1.1 safety factor in accordance with the 2017 Water Facility Plan
Update.
Water Design Report │ DEVCO North 3rd Apartments
November 2022
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4. PROPOSED WATER INFRASTRUCTURE IMPROVEMENTS
4.1. BASIS OF DESIGN
The proposed water system was sized in accordance with the Design Standards based on the water and
fire flow demand projections identified in Section 3. The design demand for the project is the combined
MDD, 138 gpm, and NFF for the highest demand building, 2,900 gpm for 3-hours. See Table 4-1 for a
summary of the water infrastructure improvements basis of design.
Table 4-1: Basis of Design - Water Improvements
Design Parameter1 Value
Minimum Water Main Diameter 8-inch
Water Main Pipe Material Ductile Iron
Maximum Pipe Velocity 15 fps
Minimum Fire Flow System Pressure 20 psi
Minimum Fire Hydrant Spacing 350-feet
Note:
1. Per City of Bozeman Design Standards
4.2. PROPOSED WATER MAIN IMPROVEMENTS
The proposed water system is depicted schematically in Figure 4-1. The system is designed to create
additionally water main looping along North 3rd Ave in the South Pressure Zone. There are four connection
points to the existing system to create a loop around the proposed development and connect existing water
mains in West Tamarack Street and West Peach Street. In total, the proposed improvements include 1,800-
lineal feet of 8-inch diameter ductile iron water main, water services for each building, fire suppression
connection for each building, fire hydrants, isolation valves and other necessary appurtenances to meet the
Design Standards. The 8-inch main installed on the east side of the project will serve buildings A, C, E, and
F while the 8-inch main installed in North 3rd Ave. will serve the clubhouse and Buildings B, D, and G.
The proposed 8-inch ductile iron water main will meet American Water Works Association (AWWA) C151-
09 Ductile Iron Pipe Standards and be rated for an operating pressure of 250 psi. The water main will have
an approximate inside diameter of 8.51-inches, per AWWA C151, and thickness of 0.27-inches. Under
normal operating conditions (no fire flow demand), pipe velocities range from 0.2 to 0.6 fps for ADD and
PHD, respectively. Pipe velocities under fire flow conditions are discussed in Section 4.3.
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Legend
Existing Water Main
Proposed Water Improvements
Building Water Service Connection
Building Fire Suppression Connection
Fire Hydrant Lateral
8-inch Water Main
G!. Fire Hydrants
.0 50 100 150 20025Feet
FIGURE 4-1: Proposed Water ImprovementsBUILDING ABUILDING BBUILDING CBUILDING DBUILDING EBUILDING FBUILDING GCLUBHOUSEPROPOSED WATER
CONNECTION POINT
PROPOSED WATER
CONNECTION POINT
PROPOSED WATER
CONNECTION POINT
PROPOSED WATER
CONNECTION POINT
Water Design Report │ DEVCO North 3rd Apartments
November 2022
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4.3. FIRE FLOW ANALYSIS
A fire flow analysis was completed using Bentley Systems WaterCAD water system modeling software to
evaluate pipe velocities and system pressures during design flow conditions. Assumptions included in the
model are identified in Table 4-2.
Table 4-2: WaterCAD Fire Flow Analysis Model Assumptions
Parameter Value Source
Hazen-Williams Pipe Roughness
"C" 130 Design Standards
8-inch Pipe Inside Diameter 8.51-inches American Cast Iron Pipe Company
Available Fire Flow Flow = 3,000 gpm
Duration = 3 hr 2017 Water Facility Plan Update (Figure 5-2)
City engineering staff provided hydrant curves for existing hydrants located near the four proposed
connection points to the existing water system. The hydrant curves were created based on the City’s
hydraulic model and provide the available fire flow and residual pressure in the system at each hydrant.
See Appendix B for the hydrant curves and other fire flow information provided by the City.
The elevations of the four existing hydrants were approximated such that the hydraulic gradeline (HGL) at
all four hydrants was constant under static conditions. Elevations of all junctions within the project site were
assigned based on the finished grade surface elevations.
The design demand condition (MDD of 138 gpm combined with NFF of 2,900 gpm for a 3-hour duration)
was modeled at all junctions. The model was set up to allocate MDD evenly between all junctions on the
two proposed water mains. The NFF demand was applied to each junction individually to evaluate fire flow
conditions throughout the proposed water system. Modelling results are provided in Appendix C. At the
design demand condition, each junction provided a residual pressure greater than 20 psi and a maximum
pipe velocity less than 15 fps; therefore, the water mains are sized appropriately to meet the Design
Standards at the design demand condition. See Table 4-3 for a summary of fire flow analysis results.
Table 4-3: Fire Flow Analysis Results Summary
Parameter Units Value
NFF gpm 2,900
MDD1 gpm 138
Minimum Residual Pressure psi 105
Maximum Pipe Velocity fps 11.13
Notes:
1. MDD is allocated between the two proposed water mains (75 gpm demand on east main, 63 gpm demand on
west main).
Water Design Report │ DEVCO North 3rd Apartments
November 2022
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5. SUMMARY
The proposed development is anticipated to demand a total of 63, 138, and 173 gpm for ADD, MDD, and
PHD, respectively. The calculated NFF is 2,900 gpm for a fire duration of 3-hours. Proposed water
infrastructure improvements include approximately 1,800-lineal feet of 8-inch diameter water main, fire
hydrants, building water service connections, building fire suppression connections, and isolations valves
designed in accordance with the City Design Standards. Hydraulic modeling was conducted to analyze pipe
velocities and residual system pressure during the design demand condition of MDD combined with NFF.
Model results demonstrate that the maximum pipe velocity is less than 15 fps and the minimum residual
pressure is greater than 20 psi; therefore, the water infrastructure improvements are sized appropriately
per City Design Standards.
Water Design Report │ DEVCO North 3rd Apartments
November 2022
A
APPENDIX A – FEMA FLOOD INSURANCE RATE MAP
Water Design Report │ DEVCO North 3rd Apartments
November 2022
B
APPENDIX B – CITY OF BOZEMAN FIRE FLOW DATA
CITY OF BOZEMAN
Fire Flow Request Form
PHONE (406) 582-3200 FAX (406) 582-3201
Date Nov 15, 2022
Location N 3rd Ave
Pressure Zone HGL 5125 (S)
GIS Hydrant ID# 16, 612, 613, 881
Adjacent Main Size 6-inch CI, 6-inch DI, 6-inch AC
Model Scenario Maximum Day Demand, Steady State, Fire Flow
Reference 2017 Water Facility Plan Update1
Hydrant Curves An Excel Spreadsheet with hydrant curves has been provided for the requested
location
Requested Location via the Bozeman Infrastructure Viewer2
If you have questions or need further information feel free to email.
Data Disclaimer: Water distribution information is calculated using hydraulic modeling software and is subject to
variation. Actual field conditions may vary. This information is provided to the requestor for evaluation purposes only,
without warranty of any kind, including, but not limited to any expressed or implied warranty arising by contract, stature, or
law. In no event regardless of cause, shall the City be liable for any direct, indirect, special, punitive or consequential
damages of any kind whether such damages arise under contract, tort, strict liability or inequity.
HOME OF MONTANA STATE UNIVERSITY
GATEWAY TO YELLOWSTONE PARK
1 https://www.bozeman.net/home/showpublisheddocument/4977/636420174896170000
2 https://gisweb.bozeman.net/Html5Viewer/?viewer=infrastructure
GIS Hydrant #
Available Flow (gpm)Residual Pressure (psi)16
0 139.04
200 138.3
400 137.13
600 135.41
800.00 133.21
1,000.00 130.54
1,200.00 127.43
1,400.00 123.89
1,600.00 119.92
1,800.00 115.54
2,000.00 110.76
2,200.00 105.57
2,400.00 99.99
2,600.00 94.02
2,800.00 87.66
3,000.00 80.91
3,200.00 73.79
3,400.00 66.29
3,600.00 58.41
3,800.00 50.17
4,000.00 41.56
4,200.00 32.58
4,400.00 23.25
4,600.00 13.55
4,800.00 3.5
Hydrant Curve
0
20
40
60
80
100
120
140
160
0 1000 2000 3000 4000 5000 6000ResidualPressure(psi)Available Flow (gpm)
Hydrant Curve
16
Data Disclaimer: Water distribution information is calculated using hydraulic modeling software and is subject to variation.
Actual field conditions may vary. This information is provided to the requestor for evaluation purposes only, without
warranty of any kind, including, but not limited to any expressed or implied warranty arising by contract, stature, or law. In
no event regardless of cause, shall the City be liable for any direct, indirect, special, punitive or consequential damages of
any kind whether such damages arise under contract, tort, strict liability or inequity.
GIS Hydrant #
Available Flow (gpm)Residual Pressure (psi)612
0 143.1
200 141.59
400 138.32
600 133.46
800.00 127.1
1,000.00 119.33
1,200.00 110.17
1,400.00 99.67
1,600.00 87.84
1,800.00 74.72
2,000.00 60.33
2,200.00 44.68
2,400.00 27.8
2,600.00 9.7
Hydrant Curve
0
20
40
60
80
100
120
140
160
0 500 1000 1500 2000 2500 3000ResidualPressure(psi)Available Flow (gpm)
Hydrant Curve
612
Data Disclaimer: Water distribution information is calculated using hydraulic modeling software and is subject to variation.
Actual field conditions may vary. This information is provided to the requestor for evaluation purposes only, without
warranty of any kind, including, but not limited to any expressed or implied warranty arising by contract, stature, or law. In
no event regardless of cause, shall the City be liable for any direct, indirect, special, punitive or consequential damages of
any kind whether such damages arise under contract, tort, strict liability or inequity.
GIS Hydrant #
Available Flow (gpm)Residual Pressure (psi)613
0 142.56
200 140.85
400 137.07
600 131.41
800.00 124.01
1,000.00 114.93
1,200.00 104.23
1,400.00 91.95
1,600.00 78.11
1,800.00 62.75
2,000.00 45.9
2,200.00 27.58
2,400.00 7.81
Hydrant Curve
0
20
40
60
80
100
120
140
160
0 500 1000 1500 2000 2500 3000ResidualPressure(psi)Available Flow (gpm)
Hydrant Curve
613
Data Disclaimer: Water distribution information is calculated using hydraulic modeling software and is subject to variation.
Actual field conditions may vary. This information is provided to the requestor for evaluation purposes only, without
warranty of any kind, including, but not limited to any expressed or implied warranty arising by contract, stature, or law. In
no event regardless of cause, shall the City be liable for any direct, indirect, special, punitive or consequential damages of
any kind whether such damages arise under contract, tort, strict liability or inequity.
GIS Hydrant #
Available Flow (gpm)Residual Pressure (psi)881
0 138.97
200 138.32
400 137.21
600 135.62
800.00 133.6
1,000.00 131.15
1,200.00 128.3
1,400.00 125.05
1,600.00 121.42
1,800.00 117.41
2,000.00 113.04
2,200.00 108.31
2,400.00 103.21
2,600.00 97.77
2,800.00 91.97
3,000.00 85.83
3,200.00 79.34
3,400.00 72.51
3,600.00 65.34
3,800.00 57.84
4,000.00 50.01
4,200.00 41.85
4,400.00 33.35
4,600.00 24.54
4,800.00 15.4
5,000.00 5.93
Hydrant Curve
0
20
40
60
80
100
120
140
160
0 1000 2000 3000 4000 5000 6000ResidualPressure(psi)Available Flow (gpm)
Hydrant Curve
881
Data Disclaimer: Water distribution information is calculated using hydraulic modeling software and is subject to variation.
Actual field conditions may vary. This information is provided to the requestor for evaluation purposes only, without
warranty of any kind, including, but not limited to any expressed or implied warranty arising by contract, stature, or law. In
no event regardless of cause, shall the City be liable for any direct, indirect, special, punitive or consequential damages of
any kind whether such damages arise under contract, tort, strict liability or inequity.
Water Design Report │ DEVCO North 3rd Apartments
November 2022
C
APPENDIX C – FIRE FLOW MODELLING RESULTS
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WATERCAD MODEL SET UP AND ORGANIZATION
Fire Flow Node FlexTable: Fire Flow Results Table
Pipe w/
Maximu
m
Velocity
Velocity of
Maximum Pipe
(ft/s)
Pressure
(psi)
Junction w/
Minimum
Pressure
(System)
Pressure
(Calculated
System Lower
Limit)
(psi)
Pressure
(Calculated
Residual)
(psi)
Pressure
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Fire Flow
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Fire Flow
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Label
P-1210.38142J-20106105202,9012,900True2J-06
P-1210.45141J-06106105202,9012,900True2J-20
P-1210.55141J-20106106202,9012,900True2J-16
P-1210.72141J-16107106202,9012,900True2J-17
P-1210.91140J-17108107202,9012,900True2J-15
P-019.71142J-08107107202,9012,900True2J-07
P-019.75142J-07107107202,9012,900True2J-08
P-019.63143J-07107107202,9012,900True2J-04
P-1211.05140J-15108107202,9012,900True2J-18
P-019.85142J-08108107202,9012,900True2J-11
P-0110.04142J-09109108202,9012,900True2J-10
P-1211.20139J-18109108202,9012,900True2J-14
P-0110.24141J-02109108202,9012,900True2J-09
P-0110.42140J-09110108202,9012,900True2J-02
P-1211.38139J-14110109202,9012,900True2J-19
P-0110.59140J-02110109202,9012,900True2J-12
P-195.09139J-19110110202,9012,900True2J-05
P-0110.80140J-13111110202,9012,900True2J-01
P-0110.95139J-01111110202,9012,900True2J-13
P-0111.21139J-13112111202,9012,900True2J-21
P-115.30139J-21113112202,9012,900True2J-03
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1666
11/17/2022
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