HomeMy WebLinkAbout20 - Design Report - Allison Ph IV - Water
WATER MAIN
DESIGN REPORT
FOR:
ALLISON SUBDIVISION
PHASE IV
BOZEMAN, MT
Prepared By:
Madison Engineering
895 Technology Drive, Suite 203
Bozeman, MT 59718
(406) 586-0262
JUNE 2020
ALLISON SUBDIVISION PHASE IV
WATER SYSTEM DESIGN REPORT
A. General
This design report will give an overview of the proposed water main extension for the 22.76 acre
development of Allison Subdivision Phase IV (Section 24, Township 02S, Range 5E, Plat J-
608A) located at the intersection of Arnold Street and S. 11th Avenue in Bozeman. The report
includes a description of the proposed water main and design parameters. The proposed
improvements are anticipated to be constructed during the summer of 2020. Once the water
main is constructed and approved, the main will become a part of the City of Bozeman system.
According to an exploratory soil test pits on site, the soil consists of topsoil to a depth of 1.0’,
followed by lean clay (brown, medium stiff, silt lenses) to a depth of 7.5’, followed by well
graded gravel (multi colored, very dense to medium dense) to a depth of 17.0’. Groundwater
was observed in spring and summer of 2019 and does not come within 4.4’ of the surface. The
average groundwater depth at the six (6) wells was 5.69’ from the surface. The soil and
groundwater found on site are suitable for this project.
The following references were used in the preparation of this report:
a. COB Design Standards and Specifications Policy, 2004. Addendum #7
b. COB Modifications to Montana Public Works Standard Specifications (MPWSS),
Addendum #3.
c. WQB Circular No. 1
d. City of Bozeman Zoning Map
e. Uniform Plumbing Code
f. City of Bozeman Water Facility Plan Update, July 2017
B. Existing Water Supply
The proposed water main extension will be served from the existing City of Bozeman water
distribution system in S. 11th Ave and in Arnold St. The following information regarding
pressures of the existing system was obtained from the City of Bozeman:
Hydrants at the intersection of Campus Blvd and S. 11th Ave.
Static Pressure: 76 psi
Pitot Pressure: 68 psi
Residual Pressure: 72 psi
Hydrant Discharge: 1,385 gpm during test, 2.5" port
Distribution Main Capacity – Fire flow at minimum residual pressure
Qr = Qt[(Ps – Pm)/(Ps – Pr)]0.54
Qr = 1,385 [(76 – 20)/(76 – 72)]0.54
Qr = 6,071 gpm at 20 psi
Where:
Qt = Hydrant Discharge During Test Pm = Minimum Residual Pressure
Qr = Fire Flow at Minimum Residual Pressure Pr = Residual Pressure
Ps = Static Pressure
Pt = Pitot Pressure
C. Proposed Water System
The proposed water main extension will consist of approximately 3,920 linear feet of 8" Class 51
Ductile Iron Pipe looped throughout the subdivision and approximately 780 linear feet of 12"
Class 51 Ductile Iron Pipe in Arnold St. The water main will be 12" in Arnold Street and 8" in
the local streets, looped throughout the subdivision.
The layout of the proposed water main will meet the City of Bozeman design criteria and will be
located within the proposed right-of ways and separated from the proposed sanitary sewer main
by a minimum distance of 10 feet. Fire hydrants will be installed so not to exceed 600’ spacing,
fulfilling the distance requirement for fire hydrant spacing, as well as assisting in flushing of the
main. Gate valves will be installed at the connection point to the existing mains as required by
the City of Bozeman design standards.
D. Capacity Analysis
A capacity analysis was performed on the proposed water main extension. The water main
extension has been designed to meet the maximum day demand plus fire flow and has also been
checked for the peak hour demand. Phase IV contains R-1, R-2 and R-3 zoning. The analysis
was completed based on 170 gpd per capita usage and 2.17 persons per unit. The number of
dwelling units per acre is from Table V-1 of the City design standards and based on gross area.
Table 1 below outlines the water demand calculations for the proposed main.
TABLE 1: WATER DEMAND – RESIDENTIAL
ALLISON SUBDIVISION PHASE IV
Zoning Area
(acres)
Dwelling
Units/Acre
Density
(residents
/unit)
Total
Residents
Daily Flow
Rate/resident
(gpd)
Total
Flow
(gpd)
R-1 10.67 3.9 2.17 90 170 15,300
R-2 7.21 5.2 2.17 81 170 13,770
R-3 4.88 6.5 2.17 68 170 11,560
Total Flow (gpd) 40,630
Total Flow (gpm) 28.22
Based on these parameters, Phase IV of Allison Subdivision will require an estimated water
usage of 40,630 gal/day, or an average daily demand of 28.22 gpm.
In addition to the average daily demand, the water main extension must account for peak periods
of daily use. Peaking factors are applied to the demand and account for these peak periods in
daily use. The peaking factors used are maximum daily use and peak hour and are obtained from
the City of Bozeman Design Standards. Table 2 shows the peaking factors and the resultant
flows from those factors when applied to the average daily demand of 28.22 gpm.
TABLE 2
PEAKING FACTORS
Flow Designation Peaking Factor Flow (gpm)
Average Day Demand 1 28
Maximum Day Demand 2.3 64
Maximum Hour Demand 3 84
The required fire flow was estimated for allowable uses within the R-3 zone, which has a higher
allowable population density than R-1 and R-2. R-3 zoning allows up to 4-household dwellings
and townhouses/rowhouses with five attached units or less. Based on this criteria, it is estimated
that the buildings within the R-3 lots will have a gross square footage of 10,000 sf, be non-
sprinklered, and have Type V-B construction. Per the adopted 2015 International Fire Code, a
2,750 gpm flow is required for the estimated structure characteristics.
A hydraulic analysis was performed using WaterCAD in order to determine operating conditions
and available fire flow. A Hazen-Williams “C” Factor of 130 was used in the pipe evaluation.
The working residual water pressure shall not be less than 20 psi at any point in the water
distribution system under maximum day plus fire flow. The velocity shall not exceed 15 feet per
second through the main line under peak hour conditions.
Results
The WaterCAD model shows that the available fire flows range from 3,083 gpm to 4,500 gpm
under the peak hour scenario. Based on the analysis, the proposed water mains within the
subdivision have adequate capacity for the maximum day demand plus fire flow and peak hour
demand. No operating conditions were outside of the required conditions during the peak hour
demand. A WaterCAD exhibit and reports for both the maximum demand plus fire flow and
peak hour scenarios are included in the appendix.
E. Conclusion
Based on this analysis, the proposed 8-inch water main extensions for the development of
Allison Subdivision Phase IV provide adequate service to meet the fire flow plus maximum day
demand and the peak hour flows for the development.
The proposed 12-inch water main extension in Arnold Street was sized to provide continuity
with the Water Facility Plan Recommendation and to ensure adequate capacity for the
surrounding area, once developed.
This project will require the approval of the City Engineer and MDEQ.
Appendix
WaterCAD exhibit and reports
Appendix:
WaterCad Exhibit and Results
Scenario: Peak Hour Flow
P-57
P-58
P-38
Page 1 of 127 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA +1-203-755-1666
6/17/2020
WaterCAD CONNECT Edition Update 2
[10.02.00.43]
Bentley Systems, Inc. Haestad Methods Solution
CenterAllison WaterCad 2020-06-16.wtg
Scenario: Peak Hour Flow
Current Time Step: 0.000 h
FlexTable: Pipe Table
G:\ACAD\2018\18-118 Allison Sub\dwg\Civil\WaterCad\Allison WaterCad 2020-06-16.wtg
Label
Length
(Scaled) (ft)
Start
Node
Stop
Node
Diameter
(in)
Hazen-
Williams C
Minor Loss
Coefficient (Local)
Flow
(gpm)
Velocity
(ft/s)
P-1 62 R-2 PMP-1 48.0 140.0 0.000 85 0.02
P-2 54 PMP-1 J-39 48.0 140.0 0.000 85 0.02
P-3 48 H-36 J-50 6.0 130.0 2.700 0 0.00
P-4 22 H-42 J-43 6.0 130.0 2.700 0 0.00P-5 133 J-43 J-39 12.0 130.0 0.000 -85 0.24
P-6 16 H-40 J-41 6.0 130.0 2.700 0 0.00
P-7 618 J-38 J-56 8.0 130.0 0.000 11 0.07
P-8 22 H-44 J-45 6.0 130.0 2.700 0 0.00P-9 344 J-49 J-43 12.0 130.0 0.000 -85 0.24
P-10 26 J-45 J-49 12.0 130.0 0.000 -85 0.24
P-11 434 J-47 J-45 12.0 130.0 0.000 -85 0.24
P-12 168 J-31 J-47 12.0 130.0 0.000 -85 0.24P-13 139 J-41 J-32 12.0 130.0 0.000 -41 0.12
P-14 425 J-50 J-41 12.0 130.0 0.000 -41 0.12
P-15 11 J-32 J-31 12.0 130.0 0.000 -85 0.24
P-16 139 J-50 J-23 8.0 130.0 0.000 30 0.19P-17 424 J-23 J-14 8.0 130.0 0.000 6 0.04
P-18 228 J-14 J-51 8.0 130.0 0.000 6 0.04
P-19 51 J-23 J-18 8.0 130.0 0.000 25 0.16
P-20 126 J-24 J-54 8.0 130.0 0.000 16 0.10P-21 29 J-54 J-10 8.0 130.0 0.000 6 0.04
P-22 233 J-51 J-24 8.0 130.0 0.000 -11 0.07
P-23 69 J-18 J-27 8.0 130.0 0.000 8 0.05
P-24 29 J-15 J-16 8.0 130.0 0.000 -17 0.11P-25 29 J-17 J-18 8.0 130.0 0.000 -17 0.11
P-26 51 J-21 J-22 8.0 130.0 0.000 -17 0.11
P-27 101 J-10 J-22 8.0 130.0 0.000 6 0.04
P-28 209 J-27 J-16 8.0 130.0 0.000 11 0.07P-29 131 J-32 J-25 12.0 130.0 0.000 44 0.12
P-30 50 J-27 J-12 8.0 130.0 0.000 -4 0.02
P-31 206 J-12 J-6 8.0 130.0 0.000 -4 0.02
P-32 380 J-6 J-54 8.0 130.0 0.000 -4 0.02P-33 432 J-54 J-2 8.0 130.0 0.000 6 0.04
P-34 158 J-16 J-55 8.0 130.0 0.000 -6 0.04
P-35 406 J-55 J-37 8.0 130.0 0.000 -6 0.04
P-36 50 J-2 J-37 8.0 130.0 0.000 6 0.04P-37 10 H-9 J-10 6.0 130.0 0.000 0 0.00
P-38 10 H-1 J-2 6.0 130.0 2.700 0 0.00
P-39 10 H-5 J-6 6.0 130.0 2.700 0 0.00
P-40 10 H-7 J-8 6.0 130.0 2.700 0 0.00P-41 10 H-3 J-4 6.0 130.0 2.700 0 0.00
P-42 27 J-37 J-28 8.0 130.0 0.000 0 0.00
P-43 48 J-33 J-49 12.0 130.0 0.000 0 0.00
P-44 23 H-46 J-47 6.0 130.0 2.700 0 0.00P-45 19 H-13 J-14 6.0 130.0 2.700 0 0.00
P-46 127 J-35 J-32 12.0 130.0 0.000 0 0.00
P-47 10 H-11 J-12 6.0 130.0 2.700 0 0.00
P-48 59 J-49 J-34 12.0 130.0 0.000 0 0.00P-49 296 J-38 J-50 12.0 130.0 0.000 -11 0.03
P-50 51 J-19 J-20 8.0 130.0 0.000 0 0.00
P-51 122 J-20 J-56 8.0 130.0 0.000 -11 0.07
P-52 30 J-56 J-30 8.0 130.0 0.000 0 0.00P-53 146 J-8 J-20 8.0 130.0 0.000 -11 0.07
P-54 160 J-29 J-53 8.0 130.0 0.000 0 0.00
P-55 219 J-53 J-24 8.0 130.0 0.000 27 0.17
P-56 425 J-25 J-4 12.0 130.0 0.000 27 0.08P-57 33 J-4 J-53 12.0 130.0 0.000 27 0.08
P-58 330 J-53 J-26 12.0 130.0 0.000 0 0.00
P-59 177 J-22 J-8 8.0 130.0 0.000 -11 0.07
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6/17/2020file:///C:/Users/Tech7/AppData/Local/Temp/Bentley/WaterCAD/xw0dptut.xml
Scenario: Peak Hour Flow
Current Time Step: 0.000 h
FlexTable: Junction Table
G:\ACAD\2018\18-118 Allison Sub\dwg\Civil\WaterCad\Allison WaterCad 2020-06-16.wtg
Label Elevation
(ft)
Demand
(gpm)
Hydraulic
Grade (ft)
Pressure
(psi)
Pressure
(Minimum)
(psi)
H-1 4,964.00 0 5,137.44 75 75
H-3 4,963.00 0 5,137.45 75 75
H-5 4,963.00 0 5,137.44 75 75
H-7 4,955.00 0 5,137.44 79 79
H-9 4,963.00 0 5,137.44 75 75
H-11 4,962.00 0 5,137.44 76 76
H-13 4,966.00 0 5,137.44 74 74
H-36 4,963.00 0 5,137.44 75 75
H-40 4,963.00 0 5,137.45 75 75
H-42 4,983.00 0 5,137.47 67 67
H-44 4,978.00 0 5,137.46 69 69
H-46 4,972.00 0 5,137.45 72 72
J-2 4,956.00 0 5,137.44 79 79
J-4 4,955.00 0 5,137.45 79 79J-6 4,955.00 0 5,137.44 79 79
J-8 4,947.00 0 5,137.44 82 82
J-10 4,950.00 0 5,137.44 81 81J-12 4,953.00 0 5,137.44 80 80
J-14 4,958.00 0 5,137.44 78 78
J-15 4,956.00 17 5,137.44 78 78J-16 4,950.00 0 5,137.44 81 81
J-17 4,954.00 17 5,137.44 79 79
J-18 4,954.00 0 5,137.44 79 79J-19 4,945.00 0 5,137.44 83 83
J-20 4,945.00 0 5,137.44 83 83
J-21 4,955.00 17 5,137.44 79 79
J-22 4,958.00 0 5,137.44 78 78
J-23 4,955.00 0 5,137.44 79 79
J-24 4,953.00 0 5,137.44 80 80
J-25 4,957.00 17 5,137.45 78 78
J-26 4,949.00 0 5,137.45 82 82
J-27 4,953.00 0 5,137.44 80 80
J-28 4,944.00 0 5,137.44 84 84
J-29 4,957.00 0 5,137.45 78 78
J-30 4,944.00 0 5,137.44 84 84
J-31 4,957.00 0 5,137.45 78 78
J-32 4,957.00 0 5,137.45 78 78J-33 4,968.00 0 5,137.46 73 73
J-34 4,968.00 0 5,137.46 73 73
J-35 4,956.00 0 5,137.45 79 79J-37 4,944.00 0 5,137.44 84 84
J-38 4,948.00 0 5,137.44 82 82
J-39 4,975.00 0 5,137.48 70 70J-41 4,955.00 0 5,137.45 79 79
J-43 4,973.00 0 5,137.47 71 71
J-45 4,968.00 0 5,137.46 73 73J-47 4,958.00 0 5,137.45 78 78
J-49 4,968.00 0 5,137.46 73 73
J-50 4,955.00 0 5,137.44 79 79
J-51 4,955.00 17 5,137.44 79 79
J-53 4,955.31 0 5,137.45 79 79
J-54 4,950.54 0 5,137.44 81 81
J-55 4,948.32 0 5,137.44 82 82
J-56 4,944.20 0 5,137.44 84 84
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6/17/2020file:///C:/Users/Tech7/AppData/Local/Temp/Bentley/WaterCAD/h4w0ukmn.xml
Scenario: Peak Hour Flow
Current Time Step: 0.000 h
FlexTable: Reservoir Table
G:\ACAD\2018\18-118 Allison Sub\dwg\Civil\WaterCad\Allison WaterCad 2020-06-16.wtg
ID Label Elevation (ft)Flow (Out
net) (gpm)
Hydraulic
Grade (ft)
114 R-2 4,995.00 85 4,995.00
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Scenario: Peak Hour Flow
Current Time Step: 0.000 h
FlexTable: Pump Table
G:\ACAD\2018\18-118 Allison Sub\dwg\Civil\WaterCad\Allison WaterCad 2020-06-16.wtg
ID Label Elevation
(ft)
Pump
Definition
Status
(Initial)
Hydraulic Grade
(Suction) (ft)
Hydraulic Grade
(Discharge) (ft)
Flow
(Total)
(gpm)
Pump
Head (ft)
115 PMP-1 4,990.00 Pump Definition - 1 On 4,995.00 5,137.48 85 142.48
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Scenario: Automated Fire Flow Analysis
Current Time Step: 0.000 h
Fire Flow Node FlexTable: Fire Flow Report
G:\ACAD\2018\18-118 Allison Sub\dwg\Civil\WaterCad\Allison WaterCad 2020-06-16.wtg
Label Fire Flow (Needed) (gpm)
Fire Flow (Available) (gpm)
Flow (Total Needed) (gpm)
Flow (Total Available) (gpm)
Pressure (Calculated Residual)
(psi)
Pressure (Zone Lower
Limit) (psi)
Pressure (Calculated Zone Lower
Limit) (psi)
Junction w/ Minimum Pressure
(Zone)
Velocity of Maximum Pipe (ft/s)
Pipe w/ Maximum Velocity
H-1 2,750 3,083 2,750 3,083 20 20 48 J-2 11.55 P-33
H-3 2,750 3,566 2,750 3,566 20 20 54 H-13 10.36 P-15H-5 2,750 3,248 2,750 3,248 20 20 51 J-6 11.13 P-30H-7 2,750 3,300 2,750 3,300 20 20 52 J-8 13.02 P-21
H-9 2,750 4,500 2,750 4,500 29 20 37 J-22 22.25 P-21
H-11 2,750 3,349 2,750 3,349 20 20 50 H-5 14.97 P-30H-13 2,750 3,101 2,750 3,101 20 20 51 J-14 10.12 P-17H-36 2,750 3,187 2,750 3,187 20 20 56 H-13 9.28 P-5
H-40 2,750 3,577 2,750 3,577 20 20 54 H-13 10.39 P-9
H-42 2,750 3,673 2,750 3,673 20 20 62 H-44 10.66 P-5H-44 2,750 3,575 2,750 3,575 20 20 60 H-42 10.38 P-5H-46 2,750 3,480 2,750 3,480 20 20 58 H-44 10.11 P-5
J-2 2,750 4,327 2,750 4,327 23 20 20 H-1 16.21 P-33
J-4 2,750 4,500 2,750 4,500 46 20 42 H-3 13.01 P-11J-6 2,750 4,500 2,750 4,500 29 20 26 H-5 15.42 P-30J-8 2,750 4,500 2,750 4,500 30 20 26 H-7 17.72 P-21
J-10 2,750 4,500 2,750 4,500 39 20 34 H-9 22.25 P-21
J-12 2,750 4,500 2,750 4,500 35 20 31 H-11 20.12 P-30J-14 2,750 4,500 2,750 4,500 26 20 23 H-13 14.68 P-17J-15 2,750 4,500 2,767 4,517 21 20 28 J-16 28.83 P-24
J-16 2,750 4,500 2,750 4,500 28 20 25 J-15 19.61 P-28
J-17 2,750 4,500 2,767 4,517 35 20 37 H-11 28.83 P-25J-18 2,750 4,500 2,750 4,500 39 20 37 H-11 19.15 P-19J-19 2,750 4,500 2,750 4,500 22 20 28 J-20 28.72 P-50
J-20 2,750 4,500 2,750 4,500 28 20 28 J-19 15.93 P-21J-21 2,750 4,500 2,767 4,517 25 20 31 J-22 28.83 P-26J-22 2,750 4,500 2,750 4,500 31 20 32 J-21 20.29 P-21J-23 2,750 4,500 2,750 4,500 41 20 38 H-13 16.02 P-16
J-24 2,750 4,500 2,750 4,500 42 20 38 H-13 14.06 P-55J-25 2,750 4,500 2,767 4,517 48 20 46 H-13 13.01 P-11J-26 2,750 4,500 2,750 4,500 42 20 42 H-3 13.01 P-9
J-27 2,750 4,500 2,750 4,500 38 20 34 H-11 16.93 P-19
J-28 2,750 4,389 2,750 4,389 23 20 20 H-1 28.01 P-42J-29 2,750 4,500 2,750 4,500 24 20 42 H-3 28.72 P-54J-30 2,750 4,500 2,750 4,500 24 20 28 J-56 14.52 P-21
J-31 2,750 4,500 2,750 4,500 50 20 47 H-13 13.01 P-5
J-32 2,750 4,500 2,750 4,500 50 20 46 H-13 13.01 P-5J-33 2,750 4,500 2,750 4,500 56 20 53 H-44 13.01 P-5J-34 2,750 4,500 2,750 4,500 56 20 53 H-44 13.01 P-5
J-35 2,750 4,500 2,750 4,500 48 20 46 H-13 13.01 P-5
J-37 2,750 4,389 2,750 4,389 27 20 20 H-1 15.81 P-33J-38 2,750 4,500 2,750 4,500 45 20 42 H-13 13.01 P-5J-39 2,750 4,500 2,750 4,500 63 20 60 H-42 0.81 P-2
J-41 2,750 4,500 2,750 4,500 49 20 45 H-13 13.01 P-9
J-43 2,750 4,500 2,750 4,500 61 20 57 H-42 13.01 P-5J-45 2,750 4,500 2,750 4,500 57 20 52 H-44 13.01 P-9J-47 2,750 4,500 2,750 4,500 53 20 47 H-46 13.01 P-5
J-49 2,750 4,500 2,750 4,500 57 20 53 H-44 13.01 P-5
J-50 2,750 4,500 2,750 4,500 45 20 42 H-36 13.01 P-5J-51 2,750 4,500 2,767 4,517 30 20 30 H-13 18.06 P-22J-53 2,750 4,500 2,750 4,500 45 20 42 H-3 13.01 P-15
J-54 2,750 4,500 2,750 4,500 41 20 36 H-9 14.14 P-20
J-55 2,750 4,500 2,750 4,500 24 20 27 H-1 17.46 P-28J-56 2,750 4,500 2,750 4,500 28 20 28 J-30 14.52 P-21
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