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Main Street Hotel
Project 07022.01
Bennett Hospitality
17 Lockwood Drive
Charleston, SC 29401
January 2024
January 2024
Project No. 07022.01
WATER AND SEWER DESIGN REPORT
FOR
MAIN STREET HOTEL
SITE NARRATIVE
The purpose of this report is to summarize the design capacity and demands of the proposed
sanitary sewer and water service installations associated with the Main Street Hotel project in
Bozeman, Montana. The water services will connect to an existing water main located in North
5th Avenue and the sewer services will connect to a new sewer main that will be in North 5th
Avenue.
WATER
The proposed water system consists of approximately 318-feet of new four (4) inch diameter
water service and approximately 315-feet of new six (6) inch diameter fire service. The
proposed four (4) inch and six (6) inch diameter services will tie-in to eight (8) inch water main
in North 5th Avenue.
The peak hour domestic demand was calculated at 39.33 gpm based on DEQ Circular 4, see
Appendix A. The pressure provided at the 8-inch water main connection in 5th Avenue, at 39.33
gpm, is approximately 112 psi. The pressure loss through the approximately 318-feet of new 4-
inch domestic service is approximately 1 psi, resulting in an expected pressure available at the
proposed hotel of 111 psi. The expected pressure at the building is adequate to service the
domestic use so the 4-inch domestic service design is acceptable. See Appendix C for hydraulic
model output data.
Fire flow test data was provided for three (3) existing fire hydrants closest to the site. Based on
the information provided by the City of Bozeman, a hydraulic model was prepared to confirm
there is adequate pressure for the domestic and fire service to the building. The building
construction type is V-A so the required fire flow without automatic sprinklers is 5,250 gpm,
per Appendix B of the 2021 IFC. Since the building will be equipped with an automatic sprinkler
system, the required demand can be reduced by 75% which is 1,312.5 gpm. The required fire
flow cannot be reduced below 1,500 gpm, so 1,500 gpm is the required fire flow for this
building. The pressure provided at the 8-inch water main connection in 5th Avenue, at 1,500
gpm, is approximately 112 psi. The pressure loss through the approximately 315-feet of new 6-
inch fire service is approximately 22 psi, resulting in an expected pressure available at the
P:BOZ_07022_01_Utility_Design_Report 2 (1/12/24) CS/rpe
proposed hotel of 90 psi. The expected pressure at the building is adequate to service the fire
sprinkler system so the 6-inch fire service design is acceptable. See Appendix C for hydraulic
model output data.
A total flow of 1,538.76 gpm (1,500 gpm fire flow demand and 39.33 gpm peak hour demand)
was used to assume the total fire flow demand on exterior hydrants. Based on this demand, the
residual pressure at the existing fire hydrant at the corner of North 5th Avenue and West Main
Street (Hydrant 111) is 115 psi, which is well above the required 20 psi minimum per the 2021
IFC and City of Bozeman requirements, see Appendix B. Therefore, the existing water main
within North 5th Avenue, Main Street, and Mendenhall Street can adequately serve the
proposed Main Street Hotel development.
SANITARY SEWER
The proposed building has two (2) sanitary sewer services exiting the building and includes the
installation of approximately 60-feet of six (6) inch PVC sewer lines. The two (2) six (6) inch
services will tie-in to a new eight (8) inch sanitary sewer main located on the west side of
North 5th Avenue.
Capacity calculations were conducted per the City of Bozeman Design Standards and
Specifications Policy dated March 2004, updated May 2017, and DEQ Circular 4. Capacity
calculations are in Appendix A. A 6-inch sewer service capacity at 75 percent full is 268-gal/min
using the minimum pipe slope of 0.02 ft/ft.
The project area is zoned B-2M, Community Business District-Mixed. We assumed each of the
125 rooms were occupied with two (2) guests for a total of 250 customers. We assumed 48
gpd/person. We also assumed that eight (8) employees will be at the proposed hotel with a
typical wastewater flow of ten (10) gpd/person. There are four (4) retail spaces located on the
first floor with four (4) assumed employees per store with a typical wastewater flow of ten (10)
gpd/person. We assumed 350 customers with a typical wastewater flow of three (3)
gpd/person. Wastewater flow demands were determined using DEQ 4 Table 3.1-1.
The typical wastewater flow for the building is as follows:
Sanitary Sewer Average Demand = 48 gpd/person * 250 guests + 10 gpd/person * 24
employees + 3 gpd/person * 350 customers = 13,290 gpd
Peak flow calculations for the proposed sanitary sewer pipes were completed to find the overall
peak flow in the six (6) inch sewer service exiting the building. The average daily flow exiting
the building was estimated at 9.23 gal/min. A peaking factor of 4.24 was then applied for a peak
hourly flow rate of 39.16 gal/min. An infiltration flowrate of 0.16 gal/min was then used to
calculate a total peak hourly flow rate with infiltration of 39.33 gal/min, which is significantly less
than the six (6) inch capacity of 268 gal/min stated above and therefore, has been designed to
adequately serve the proposed development.
P:BOZ_07022_01_Utility_Design_Report 3 (1/12/24) CS/rpe
CONCLUSION
Based on the assumptions provided above, the proposed six (6) inch sanitary sewer services,
four (4) inch water service, and six (6) inch fire service installations will provide the required
hydraulic capacity for the proposed Main Street Hotel. Please contact Bobby Egeberg, PE for
any questions pertaining to this report by email, begeberg@sandersonstewart.com or by phone
406-922-4308.
APPENDIX A Water and Sewer Demand Calculations Main Street Hotel
07022.01
Project: 07022.01 Main Street HotelDate: 1/12/2024Capacity Calclulations6" Pipe Flowing Full Capacity0.80cfs6" Pipe Flowing Full Capacity357gal/minQ/Qfill @ 75% full, 0.75per nomographCapacity @ 75% full268gal/minSystem Demand (Per DEQ 4 Table 3.1-1)PeopleFlowAreaDESIGNATION(#)(AC)DEQ 4 - (Hotel/Motel - Assumed 10 gallons/employee/day)880gal/day1.575DEQ 4 - (Hotel/Motel - Assumed 48 gallons/guest/day)25012000gal/dayDEQ 4 - (Store - Assumed 10 gallons/employee/day)16160gal/dayDEQ 4 - (Store - Assumed 3 gallons/customer/day)3501050gal/day9.23gal/minPeaking Factor (per DEQ circular 2 formula)4.24Peak Hourly Flow39.16gal/minInfiltration at 150 gal/acre/day (per City of Bozeman)236.25gal/dayInfiltration gal/min0.16gal/minTotal Peak Hourly Flow plus Infiltration39.33gal/minResultQ/Qfull based on peak hour0.15Percent Full for 6" From Nomograph at peak hour31%Service Lot
Main Street Hotel
07022.01 APPENDIX B Fire Flow Test Analysis
CITY OF BOZEMAN
Fire Flow Request Form
PHONE (406) 582-3200 FAX (406) 582-3201
Date March 31, 2022
Location 5th and Main Street
Pressure Zone Northwest
GIS Hydrant ID# 110,111,112
Adjacent Main Size 8-inch DI, 6-inch DI, 6-inch DI
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/government/engineering/permits-plans-projects 2 https://gisweb.bozeman.net/Html5Viewer/?viewer=infrastructure
GIS Hydrant #
Available Flow (gpm) Residual Pressure (psi)110
0 124.15
200 123.75
400 123.25
600 122.7
800 122.07
1,000.00 121.34
1,200.00 120.51
1,400.00 119.6
1,600.00 118.59
1,800.00 117.49
2,000.00 116.31
2,200.00 115.04
2,400.00 113.68
2,600.00 112.24
2,800.00 110.71
3,000.00 109.1
3,200.00 107.41
3,400.00 105.63
3,600.00 103.78
3,800.00 101.84
4,000.00 99.83
4,200.00 97.74
4,400.00 95.57
4,600.00 93.32
4,800.00 90.99
5,000.00 88.59
5,200.00 86.12
5,400.00 83.56
5,600.00 80.94
5,800.00 78.24
6,000.00 75.46
6,200.00 72.62
6,400.00 69.67
6,600.00 66.64
6,800.00 63.54
7,000.00 60.37
7,200.00 57.13
7,400.00 53.81
7,600.00 50.42
7,800.00 46.95
8,000.00 43.41
8,200.00 39.81
8,400.00 36.13
8,600.00 32.38
8,800.00 28.56
9,000.00 24.66
9,200.00 20.7
9,400.00 16.67
9,600.00 12.56
9,800.00 8.39
10,000.00 4.15
10,192.39 0.01
Hydrant Curve
0
20
40
60
80
100
120
140
0 2000 4000 6000 8000 10000 12000Residual Pressure (psi)Available Flow (gpm)
Hydrant Curve
110
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)111
0 122.64
200 122.18
400 121.54
600 120.71
800 119.71
1,000.00 118.54
1,200.00 117.18
1,400.00 115.65
1,600.00 113.95
1,800.00 112.08
2,000.00 110.05
2,200.00 107.86
2,400.00 105.51
2,600.00 103
2,800.00 100.34
3,000.00 97.52
3,200.00 94.54
3,400.00 91.42
3,600.00 88.15
3,800.00 84.73
4,000.00 81.16
4,200.00 77.44
4,400.00 73.58
4,600.00 69.57
4,800.00 65.42
5,000.00 61.13
5,200.00 56.7
5,400.00 52.13
5,600.00 47.41
5,800.00 42.56
6,000.00 37.58
6,200.00 32.45
6,400.00 27.19
6,600.00 21.75
6,800.00 16.18
7,000.00 10.49
7,200.00 4.65
7,354.97 0.03
Hydrant Curve
0
20
40
60
80
100
120
140
0 1000 2000 3000 4000 5000 6000 7000 8000Residual Pressure (psi)Available Flow (gpm)
Hydrant Curve
111
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)112
0 122.17
200 121.39
400 119.91
600 117.78
800 115.03
1,000.00 111.69
1,200.00 107.77
1,400.00 103.29
1,600.00 98.26
1,800.00 92.7
2,000.00 86.61
2,200.00 79.99
2,400.00 72.86
2,600.00 65.22
2,800.00 57.08
3,000.00 48.44
3,200.00 39.31
3,400.00 29.69
3,600.00 19.59
3,800.00 9.02
Hydrant Curve
0
20
40
60
80
100
120
140
0 500 1000 1500 2000 2500 3000 3500 4000Residual Pressure (psi)Available Flow (gpm)
Hydrant Curve
112
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.
APPENDIX C Hydraulic Model Results Main Street Hotel
07022.01
WaterCAD Model Layout
LabelElevation (ft)Demand (gpm)Hydraulic Grade (ft)Pressure (psi)J-14,822.2005,086.87115J-24,820.5005,080.42112J-34,820.5005,080.42112J-54,823.50395,080.01111J-64,824.0005,080.09111J-74,824.0005,039.7293J-84,823.5015005,030.9290Junction Table
Label Length (ft) Start Node Stop Node Diameter (in) Material Hazen-Williams C Flow (gpm) Velocity (ft/s)Headloss Gradient (ft/ft)P-11R-1PMP-18Ductile Iron1301,5399.830.041P-21PMP-1J-18Ductile Iron1301,5399.830.041P-3159J-1J-28Ductile Iron1301,5399.830.041P-43J-2J-38Ductile Iron130390.250.000P-5258J-3J-64Ductile Iron130391.000.001P-660J-6J-54Ductile Iron130391.000.001P-7259J-2J-76Ductile Iron1301,50017.020.157P-856J-7J-86Ductile Iron1301,50017.020.157Pipe Table
Flow (gpm)Residual Pressure (psi)Head (ft)0122.64282.961,000118.54273.502,000110.05253.913,00097.52225.004,00081.16187.265,00061.13141.046,00037.5886.716,60021.7550.18Pump Curve