HomeMy WebLinkAboutWater Design Report 06-25-19 WATER MAIN
DESIGN REPORT
FOR:
NEXUS POINT
DEVELOPMENT
BOZEMAN, MT
Madison Engineering
895 Technology Blvd Ste 203
Bozeman, MT 59718
(406) 586-0262
MAY 2019
NEXUS POINT DEVELOPMENT
WATER SYSTEM DESIGN REPORT
A. General
This design report will give an overview of the proposed water main extension for the development
of Nexus Point Multi-Unit Residential & Office Building Development Infrastructure
Improvements. The proposed Phase 1 improvements are anticipated to be constructed during the
fall of 2019. Once the water main is constructed and approved,the main will become a part of the
City of Bozeman system.
The following references were used in the preparation of this report:
a. COB Design Standards and Specifications Policy, 2017. Addendum#6
b. COB Modifications to Montana Public Works Standard Specifications (MPWSS).
c. WQB Circular No. 1
d. City of Bozeman Zoning Map
e. City of Bozeman Water Facility Plan
f. 2015 International Fire Code
Existing System
The proposed water main extension will be served by the existing City of Bozeman water
distribution system, which will be looped. The two connection locations are the existing stub of
Lantern Lane and future stub at intersection of Lantern Lane and S 21" Avenue, which will
continue south and connect to the intersection of Graf Street and S 21 st Avenue. The following
information was obtained by the City of Bozeman at the intersection of Lantern Lane and
Enterprise Boulevard.
Fire Hydrants: 2077
Static Pressure: 65 psi
Pitot Pressure: 56 psi
Residual pressure: 57 psi
Hydrant discharge: 1,250 gpm from 2.5" port
Distribution Main Capacity—Fire flow at minimum residual pressure
Qr=Qt[(Ps—PMAPs—P0]0.54
Qr= 1,250 [(65—20)/(65 —56]0.54
Qr =2,981 gpm at 20 psi
Qt= Hydrant Discharge during Test
Qr= Fire Flow at Residual Pressure
P,= Static Pressure
Pm = Minimum Residual Pressure=20 psi
Pr= Residual Pressure
Pt= Pitot Pressure
Nexus Point Development
Water Design Report
Page 1 of 3
B. Proposed Water System
The proposed water main extension for the Nexus Point development consists of approximately
2,499 linear feet of 8"ductile iron pipe that will connect to the existing water main stub on Lantern
Lane and at the future intersection of Lantern Lane and S 21 It Avenue,which is to be installed with
the 2131 Graf project. The layout of the proposed water main meets the COB design criteria and
will be located within the easements/right of way and separated from the proposed sanitary sewer
main by a minimum of 10 feet horizontally. Fire hydrants will be installed per COB design criteria
and will not exceed the recommended distance.
C. Capacity Analysis
The Nexus Point development water main extension is proposed for the development of the 14-
buildings comprised of 240-units (120 units per phase & 2 office buildings), which sits on an
estimated 19.99 acres of R-O (Residential Office District)zoned land. An estimation of the water
flow rate was based on the City of Bozeman's design standards and specification policy, which
suggests using an average daily flow rate of 2.11 people per dwelling unit and 170-gallons per
capita per day. Applied to the 240 units,the required water flow rate is calculated:
(
residents gallons 240 units * 2.11 unit * 170 capita
day) = 86,088 gpd
ca
P
Based on these parameters, the development at full build out will have an estimated water usage
of 86,088 gpd (59.78 gpm). The main will connect to the existing City of Bozeman system and
will serve the future Nexus Point apartment buildings.
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 1 shows the peaking factors and the resultant flows
from those factors when applied to the average daily demand of 59.78 gpm.
TABLE 1
PEAKING FACTORS
Flow Designation Peaking Factor Flow m
Average Day Demand 1 59.8
Maximum Day Demand 2.3 137.5
Maximum Hour 3 179.4
Demand
Based on communication with the architect, four types of buildings will be installed and will
consist of two (2)—multi-floor office buildings, six (6) — 12 plex 2-bedroom units, four (4)—30
plex 1 & 2—bedroom units and two (2)—24 plex 2-bedroom units along with a club house for a
total of 14 individual buildings. The square footage for each type of building are as follows: 12
Plex = 12,552sf, 30 Plex= 38,800sf, 24 Plex = 24,046sf and the club house = 9,989sf. The units
are expected to be type V-A and V-B construction with fire sprinklers. A Type V-A 38,800sf
Nexus Point Development
Water Design Report
Page 2 of 3
building requires 3,500 gpm for a 3-hour flow duration per the 2015 International Fire Code,Table
B 105.1(2). The flow capacity for the largest building was chosen to be more conservative. Based
on the 2015 International Fire Code's Table B 105.2, the 3,500 gpm fire flow can be reduced but
shall not be less than the minimum of 1,500 gpm.
Results
Based on the analysis outlined above, the required minimum fire flow is 1,500 gpm and the
maximum hour demand is 179.4 gpm. The combination of these results in a maximum hour flow
of 1,679.4 gpm. The attached WaterCAD analysis was designed to incorporate the maximum hour
demand throughout the system. A fire flow analysis was performed at each node throughout the
system(including the base max. hour demand)where a building has a potential fire flow demand.
The flow analysis shows that an 8-inch DI pipe can provide the development with the required
flow of 1,679.4 gpm and remain above the minimum pressure of 20 psi. See attached flow analysis
for calculations.
D. Conclusion
Based on this analysis, the proposed 8-inch ductile iron water main serving the Nexus Point
residential development extension provides adequate service to meet the 240-unit peak hour
demand and fire flows requirements for the development. The water main was designed on
conservative premise for future development.For instance,only one connection point(intersection
of Lantern Lane and Enterprise Blvd.)was modeled,when in reality there will be two connection
points for the system. The water main design is consistent with the City of Bozeman Water Facility
Plan.
This project will require the approval of the City of Bozeman Engineer and MDEQ.
Nexus Point Development
Water Design Report
Page 3 of 3
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Fire Flow Node FlexTable: Fire Flow Report
Label Zone Fire Flow Satisfies Fire Fire Flow Fire Flow
Iterations Flow (Needed) (Available)
Constraints? (gprn) (gpm)
3-1 <None> (N/A) False 1,500 (N/A)
3-3 <None> (N/A) False 1,500 (N/A)
3-4 <None> (N/A) False 1,500 (N/A)
3-5 <None> (N/A) False 1,500 (N/A)
3-6 <None> (N/A) False 1,500 (N/A)
1-7 <None> (N/A) False 1,500 (N/A)
3-8 <None> (N/A) False 1,500 (N/A)
J-9 <None> (N/A) False 1,500 (N/A)
J-10 <None> (N/A) False 1,500 (N/A)
J-12 <None> (N/A) False 1,500 (N/A)
J-13 <None> (N/A) False 1,500 (N/A)
3-14 <None> (N/A) False 1,500 (N/A)
J-15 <None> (N/A) False 1,500 (N/A)
3-19 <None> (N/A) False 1,500 (N/A)
1-21 <None> (N/A) False 1,500 (N/A)
3-28 <None> (N/A) False 1,500 (N/A)
3-31 <None> (N/A) False 1,500 (N/A)
3-37 <None> (N/A) False 1,500 (N/A)
1-48 <None> (N/A) False 1,500 (N/A)
3-50 <None> (N/A) False 1,500 (N/A)
J-52 <None> (N/A) False 1,500 (N/A)
3-54 <None> (N/A) False 1,500 (N/A)
3-56 <None> (N/A) False 1,500 (N/A)
1-60 <None> (N/A) False 1,500 (N/A)
3-66 <None> (N/A) False 1,500 (N/A)
J-68 <None> (N/A) False 1,500 (N/A)
1-73 <None> (N/A) False 1,500 (N/A)
J-77 <None> (N/A) False 1,500 (N/A)
J-2 <None> 3 True 1,500 1,833
3-23 <None> 2 True 1,500 2,170
3-25 <None> 2 True 1,500 2,170
1-26 <None> 5 True 1,500 1,983
3-33 <None> 5 True 1,500 1,850
3-35 <None> 2 True 1,500 2,170
J-38 <None> 2 True 1,500 2,170
3-40 <None> 2 True 1,500 2,170
J-42 <None> 2 True 1,500 2,170
3-44 <None> 2 True 1,500 2,170
3-46 <None> 6 True 1,500 2,088
3-58 <None> 2 True 1,500 2,170
1-62 <None> 5 True 1,500 1,844
3-64 <None> 2 True 1,500 2,170
3-71 <None> 2 True 1,500 2,170
1-75 <None> 5 True 1,5001 1,903
Flow(Total Flow(Total Pressure Pressure Pressure(Zone Pressure
Needed) Available) (Residual Lower (Calculated Lower Limit) (Calculated Zone
(gpm) (gpm) Limit) Residual) (psi) bower Limit)
(psi) (psi) (psi)
Bentley Systems,Inc. Haestad Methods Solution WaterCAD CONNECT Edition Update 2
Nexus Point WaterCad.wtg Center [10.02.00.43]
6/25/2019 27 Siemon Company Drive Suite 200 W Page 1 of 3
Watertown,CT 06795 USA +1-203-755-1666
Fire Flow Node FlexTable: Fire Flow Report
Flow(Total Flow(Total Pressure Pressure Pressure(Zone Pressure
Needed) Available) (Residual Lower (Calculated Lower Limit) (Calculated Zone
(gpm) (gpm) Limit) Residual) (psi) Lower Limit)
(psi) (psi) (psi)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
(N/A) (N/A) 20 (N/A) 20 (N/A)
1,500 1,833 20 20 20 23
1,500 2,170 20 30 20 29
1,500 2,170 20 28 20 26
1,500 1,983 20 23 20 20
1,500 1,850 20 23 20 20
1,500 2,170 20 27 20 27
1,500 2,170 20 24 20 20
1,500 2,170 20 27 20 24
1,500 2,170 20 28 20 25
1,500 2,170 20 27 20 23
1,500 2,088 20 23 20 20
1,500 2,170 20 25 20 25
1,500 1,844 20 23 20 20
1,500 2,170 20 26 20 24
1,500 2,170 20 27 20 24
1,500 1,903 20 231 20 20
Bentley Systems,Inc Haestad Methods Solution WaterCAD CONNECT Edition Update 2
Nexus Point WaterCad.wtg Center [10.02.00.43]
6/25/2019 27 Siemon Company Drive Suite 200 W Page 2 of 3
Watertown,CT 06795 USA +1-203-755-1666
Fire Flow Node FlexTable: Fire Flow Report
Junction w/ Pressure Pressure Junction w/ Is Fire Flow Run
Minimum (System Lower (Calculated Minimum Balanced?
Pressure(Zone) Limit) System Lower Pressure
(psi) Limit) (System)
(psi)
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
(N/A) (N/A) (N/A) (N/A) False
J-1 (N/A) 23 J-1 True
J-2 (N/A) 29 1-2 True
J-2 (N/A) 26 J-2 True
J-2 (N/A) 20 J-2 True
J-2 (N/A) 20 J-2 True
J-9 (N/A) 27 J-9 True
3-2 (N/A) 20 J-2 True
J-2 (N/A) 24 J-2 True
J-2 (N/A) 25 J-2 True
J-2 (N/A) 23 J-2 True
J-2 (N/A) 20 J-2 True
3-60 (N/A) 25 J-60 True
J-2 (N/A) 20 J-2 True
J-2 (N/A) 24 J-2 True
J-2 (N/A) 24 J-2 True
J-2 (N/A) 20 J-2 True
Bentley Systems,Inc. Haestad Methods Solution WaterCAD CONNECT Edition Update 2
Nexus Point WaterCad wtg Center [10.02.00 43]
6/25/2019 27 Siemon Company Drive Suite 200 W Page 3 of 3
Watertown,CT 06795 USA +1-203-755-1666