HomeMy WebLinkAbout93 - Design Report - HRDC Housing Project (West Babcock Subdivision) - Water, Sewer DESIGN REPORT
FOR
HRDC HOUSING PROJECT
WATER SYSTEM AND SANITARY SEWER SYSTEM
EXTENSIONS OF CITY OF BOZEMAN UTILITY SERVICES
BOZEMAN, MONTANA
AUGUST 1993
Prepared By: Morrison-Maierle/CSSA
901 Technology Boulevard
P.O. Box 1113
Bozeman, MT 59715
Prepared By: Jack R. Sch
Glenn A.
MM# 2538. V W0310
S H N, ? ,
4615 E
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HRDC HOUSING PROJECT
EXTENSION OF CITY OF BOZEMAN WATER AND SEWER SYSTEMS
BOZEMAN, MONTANA
SCOPE
This report is presented as a basis of design for the extension
of existing City of Bozeman water and sanitary water mains for
this HRDC subdivision. This existing 10.12 acre site is located
in the W 1/2 of NE 1/4 of Section 11, Township 2 South, Range 5
East, P.M.M. , Gallatin County, Montana. The subdivision site is
within the city limits of Bozeman.
The proposed improvements include:
1. Asphalt street improvements include 1630 lineal feet of
streets to the City of Bozeman Standards, including curb,
gutter and sidewalks.
2. Water main extension includes 2045 lineal feet of 8-inch DI
pipe and 676 lineal feet of 10-inch DI pipe.
3. Sanitary sewer main extension includes 1433 lineal feet of
8-inch and 1546 lineal feet of 10-inch SDR 35 PVC pipe.
SANITARY SEWER
Generated Wastewater Assumptions
Slope = 1%
Manning's n = 0.013
Average household = 3.2 people
Average wastewater = 100 gpd
(per person)
Peaking factor = 4.1
Proposed Service Area for new main between West Babcock and Beall
Street to include the proposed subdivision and 34 additional
existing and future units along Western Drive and the future
extension of N. 25th south of Mendenhall.
Proposed Service Area for new main between Beall Street and
Durston Road to include the above described area and 56 existing
and future units along Western Drive and N. 25th north of Menden-
hall and the 18.2 acres lying east of N. 25th and south of Dur-
ston. 20% of the undeveloped acreage will be deducted for
streets and parkland, with the remainder to be developed as four
family, two story apartment. (R-4 oning for these dwellings
state lot size to be 5000 ft + 800 ft for each unit over one) .
New Main within proposed subdivision
Living units H.R.D.C. 51 units (27 single family + 24
multi-family units)
Surrounding Area 34 units
TOTAL 85 units
Generated Wastewater:
85 units x 3.2 people x 100 _qpd x 1 day x 1 hr = 18.9 gpm,
unit person 24 hr 60 min
Peak demand = 18.9 gpm x 4.1 peaking factor = 77. 5 gpm
Capacity of 8-inch main at 1% slope
Manning' s Equation 82/3
Q = 1.49 x (8/12)2� x 12 x (0.01)1/2 = 1.21 cfs
0.013 4 4
Q = 1.21 cfs x 448.8 gpm/cfs = 544 gpm
Summary - 8-inch adequate for proposed flow
New Main South of proposed Subdivision
Living Units West of N. 25th 51 units
Living Units (R-4) 343 units
394 units
Generated Wastewater:
394 units x 3.2 people x 100 gpd x 1 day x 1 hr = 87.6 gpm
unit person 24 hr 60 min
Peak demand = 87.6 gpm x 4.1 = 359.2 gpm
Total flow = 77.5 gpm + 359.2 gpm = 436.7 gpm
Total flows generated approximately 450 gpm
544 gpm - 450 gpm = 94 gpm
(pipe capacity at 94% full = 592 gpm)
Summary - 8-inch main capacity at 1% sufficient for proposed
population density.
WATER
Water supply for the proposed subdivision will be by the City of
Bozeman distribution system. Existing 10-inch water mains are
located in West Babcock and in West Durston Road. The water main
for the subdivision will loop between these two 10-inch existing
water mains. The average daily water pressure is approximately
140 psi ( from City of Bozeman, Water Distribution System Computer
Model Numbering System Appendix B) .
An 8-inch ductile iron water main is proposed to loop between the
existing 10-inch water mains described above. An extension of
the West Durston Road 10-inch water main is part of this project.
Fire hydrants and gate valves are included in accordance with
standard requirements.
The proposed subdivision will consist of:
27 single family homes
24 multi-family units in 6 four plex buildings
51 total living units
Water consumption per units is 320 gallons per day.
3.2 persons per living unit
100 gallons per person
Domestic water demand is 51 units x 3 . 2 persons x 100 gpd =
16,320 gpd or 11.33 gpm
Design flow requirements = 11.33 gpm x 9 peak factor (Salvato)
= 102 gpm
Irrigation is 667 gallons per day per building unit.
27 single family units
6 multi-family units
33 buildings
Total irrigation demand is 33 units x 667 gpd = 22, 011 gpd or
15.3 gpm for irrigation.
Total demand is Domestic + Irrigation = 102 gpm + 15 .3 gpm =
117.3 gpm
Fire protection requirement:
1500 gpm for 2 hours to be provided by the City of Bozeman. The
proposed 8-inch water main will supply at least 2494 gpm with 35
psi residual in the system. See attached computed variable
sheets.
SPECIFICATIONS:
Montana Public Works Standard Specifications, Third Edition,
October 1988 with Addendum No . 1 and City of Bozeman
Modifications will be used to install these improvements. Depth
of bury will provide a minimum cover of 6. 5 vertical feet over
the water mains. Class 51 Ductile Iron Pipe will be the pipe
materials.
Sanitary sewer pipe materials will be SDR 35 PVC pipe. Manholes
will be 48 inch diameter.
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