HomeMy WebLinkAboutFire Flow Conditions-4"O� vz-zrf '&
❑ ❑ Kimley-Horn
and Associates, Inc.
Technical Memorandum
Suite 201
2800 Seulh Texas Avenue
Bryan, Texas
77802
To: City of College Station
From: J. Chris Harris, P.E.
Date: April 24, 2012
Subject: The Stack
Fire Flow Conditions
KHA Project No. 067543000
Purpose
The proposed development consists of mixed use development building on
approximately 3.05 developed acres. This technical memorandum presents
results of the water system analysis for the proposed development.
This memorandum is divided into the following sections:
• References and Design Criteria
• Results
• Conclusion
References and Design Criteria
References
Water distribution mains throughout the development were sized by creating a
hydraulic model of the system, using WaterCAD version 7.0 by Bentley Systems.
The following data and references were used for creation of the model:
Fire flow tests performed by College Station Utilities on December 28,
2011 near the proposed development site, attached as Appendix A.
Design Criteria
Water distribution mains were sized based on design criterialisted in the 2009
Bryan / College Station Unified Design Guidelines for Domestic Water. Design
criteria used for this analysis includes:
The Stack
Water System Analysis
April 24, 2012
Page 2
Peak Flow Conditions
o Provide minimum static pressure of 35 pounds per square inch
(psi).
Fire Flow Conditions
o Provide the required fire flow at the most hydraulically remote
pairings of 2 adjacent fire hydrants in the system improvement
in addition to the peak hourly flow.
o A residual pressure of 20 psi is required to be maintained.
o Velocity shall not exceed 12 feet per second (fps)
The Unified Design Guidelines allow for multiple methods for calculation of
flow for a development. For this analysis, Method 1 — Fixture Count
Determination was used. The building has a Peak Hourly Demand of 380 GPM.
The total building square footage is 322,359 square feet (SF). The proposed
building has 200,447 square feet (SF) of Type VA and 121,912 square feet (SF)
of Type IA based on International Building Code. For worst case, Building Type
VA was applied to the entire development of 322,359 square feet (SF). The
International Fire Code Table B 105.1 lists this building to have a fire flow of
8,000 GPM. A 50% reduction as listed in the Unified Development Ordinance
was applied to listed fire flow of 8,000 GPM, which requires the fire flow to be
4,000 GPM. This flow has been split between two fire hydrants on site as
allowed in the Design Guidelines.
A minimum flow of 1000 GPM was also applied to each of the four hydrants
serving the site as an additional, supplemental scenario of analysis to provide the
required 4000 GPM.
Results
Peak Demand Condition
Peak demand conditions are considered to be municipal demand as determined
from fixture counts. During peak conditions, system pressures throughout the
development are greater than the required 35 psi. Resulting pressures range from
77 psi to 80 psi. WaterCAD results of the peak demand scenario are included as
Appendix B of this memorandum.
The Stack
Water System Analysis
April 24, 2012
Page 3
Fire Flow Conditions
The fire flow demand of 4,000 gpm was added to peak flow and distributed
evenly at the most hydraulically remote and highest elevation hydrant locations,
represented by Junctions H-I and H-4.
Results of the fire flow scenario show that residual pressures range from 61 psi to
66 psi, exceeding the minimum 20 psi requirement. Pipe velocities are all less
than the maximum 12 fps. The WaterCAD results for the fire flow scenario are
included in Appendix B.
Results of the supplemental fire flow scenario show that residual pressures range
from 62 psi to 66 psi, exceeding the minimum 20 psi requirement. Pipe
velocities are all less than the maximum 12 fps. The WaterCAD results for the
fire flow scenario are included in Appendix B.
Conclusion
In conclusion, the water distribution mains proposed for the development exceed
the minimum requirements as described in this memorandum.
c
rn
a r.
❑ v
N
N
N
tLt
H
D]
O a u
O 'O i
O
O
O
O
O
O
0
O
O
O
ry
v i w
O
O
O
O
O
O
O
O
S l�
T
o f
g
a
o
C
v =
0
0
0
0
0
0
0
0
0
0
0
O
U
a
w
W
W
v >
2 u N
Q
Q
Q
Q
Q
Q
-
Q
N
Q
—
Q
N
Q
—
Q
V
E
0
0
0
0
0
0
0
0
0
0
0
c
a
m
2
—
o
0
0
c
0
c
0
U
U
U
U
U
V
v
>
>
>
>
>
>
a
v
a
v
v
`w
a C
E
N
N
t0
ry
ti
W
W
M
M
OJ
tD
a
O
O
h
2
6
a
Y
Y
Y
n
_
6
w
_
H
H
H
c
ai
^
v
of
ai
io
m
m
w
m
m
a
N
M
OJ
d'
l0
h
ti
V
ti
m
a
d
d
d
d
d
u
d
d
d
H
d
v
�
to
Vl
N
N
M
M
m
W
V
N
rl
m
d'
N
m
a
E a
o
o
m
o
0
0
0
0
N m
m
N
N
❑
N
111
m
m
m
>
m
M
m
m
M
M
w
u
x
p
m
m
V
N
w
m
0^
a0 v G i 0 0 u? p O m 0 1p p p
a r.
x� 'v c z s z rc z c c cc z cc c
o w
o 0 0 0 0 0 0 0 0 0 0
x � _
MEMO
m m m N ro w
o � ^ tO ^ ^ ^ o ^ o � � o
m o d o 0 0 0 0
3 c e
O a 1� O^^^ O N 0 0 0 0
m ry
N
O
v O
J O
U
v N N N N N N N N N N N
N N >
u
E
3 o p o 0 0 0 0 0 0 0 0
ti m ti ti ti ti .r ti���
c
v
2
c
c
v.
6
=
>
>
>
>
>
N
N
W
6
6
O
7
7
O
J
a
cc
0c
0c
0
III
ry
Y
Y
Y
O
O
l
x
x
x
o
m
c m •.-.
^
c
ni
o
ry
m
"
m
m^
m
m
of
ai
>
m
m
m
m
m
m
m
a
m
m
U
d
d
3
d
x
r
M
m
p
O o-
v
H
F
H
H
F
H
H
H
H
H
H
p
x t�
3 E
m
m
o
m
�+
m
o
O1
m
o
m
N
N
rl
fi
`�
rl
C
v
� v �
O "
U
Y �
v
N
N
N
N—
N
iN—
v > =
a
a
a
a
a
a
a
a
a
V >
U
E
0
0
0
0
0
0
o
a
o
0
0
c
v
x
�
c
o
c
0
c
0
c
0
c
0
a
n
n
n
n
n
'`.
----
0
0
0
0
0
`v
N
p
a
O
o
N
a
a
a
Y
Y
Y
n
w
w
w
x
x
x
wN w
m
r•
V
W
m
m
r•
�
O
N�
ry
m
m
a
io
n
ti
a
.-i
H
H
Z�
d
d
2
d
d
p
M
O
M
rl
CO
h
h
M
V
m
in
�n
in
c
io
m
,
n
r
1
N
v
—
vi
v
vi
m
c
r
n
m
N
Vl
In
N
m
V
ri
N
W�
�'
lO
tD
l0
t0
10
l(1
lO
l0
m E
o
0
0
0
o
0
0
0
0
0
C 0
E a
v ?4
m
p
«
m
m
m
m
m
m
m
m
>
m
m
m
m
m
m
w
V
x
x
S
F
p
O
m
m
ry
m
m
O
n
College Station Utilities
Rellable, Affvrdahle, Community Owned
Date test completed Friday August 2, 2013
Time completed 10:45 A.M.
Test completed by Justin Tamplin, Paul Schoenfeld, Howard Mitchell, Wyatt J.
Witness
ICI'/�77�ai
size
rant number
itot reading in PSI
low in G.P.M.
711 University The Stack
2.5
A-080, A-081, A-082 and A-069
35, 40, 40 and 40
STATIC HYDRANT
Location 801 University
Hydrant number A-022
Static PSI 78
Residual PSI 60
Comments For Initial
'I I, Kmley-Horn
L1 and Associates, Inc.
Technical Memorandum
To:
City of College Station
From:
J. Chris Harris, P.E.
Date:
February 15, 2012
Subject:
The Stack
Fire Flow Conditions
KHA Project No. 067543000
Purpose
The proposed development consists of mixed use
approximately 3.05 developed acres. This technical memorandum presents
results of the water system analysis for the proposed development.
This memorandum is divided into the following sections:
• References and Design Criteria
• Results
• Conclusion
References and Design Criteria
References
Water distribution mains throughout the development were sized by creating a
hydraulic model of the system, using WaterCAD version 7.0 by Bentley Systems.
The following data and references were used for creation of the model:
Fire flow tests performed by College Station Utilities on December 28,
2011 near the proposed development site, attached as Appendix A.
Design Criteria
Water distribution mains were sized based on design criteria listed in the 2009
Bryan / College Station Unified Design Guidelines for Domestic Water. Design
criteria used for this analysis includes:
Suite 201
2800 South Texas Avenue
Bryan, Texas
77802
The Stack
Water System Analysis
February 15, 2012
Page 2
Peak Flow Conditions
o Provide minimum pressure of 35 pounds per square inch (psi)
Fire Flow Conditions
o Provide a fire flow of 2,500 gallons per minute (gpm)
o Provide the required fire flow at the most hydraulically remote
pairings of 2 adjacent fire hydrants in the system improvement
in addition to the peak hourly flow.
o A residual pressure of 20 psi is required
o Velocity shall not exceed 12 feet per second (fps)
The Unified Design Guidelines allow for multiple methods for calculation of
flow for a development. For this analysis, Method 1 — Fixture Count
Determination was used. The building has a Peak Hourly Demand of 380 gpm.
The total building square footage is 322,359 square feet (SF). The proposed
building has 200,447 square feet (SF) of Type VA and 121,912 square feet (SF)
of Type IA based on International Building Code. For worst case, Building Type
VA was applied to the entire development of 322,359 square feet (SF). The
International Fire Code Table B 105.1 list this building to have a fie flow of
8,000 gpm. A 50% reduction as listed in the Unified Development Ordinance
was applied to listed fire flow of 8,000 gpm which requires the fire flow to be
4,000 gpm. This flow has been split between two fire hydrants on site as allowed
in the Design Guidelines.
Results
Peak Demand Condition
Peak demand conditions are considered to be municipal demand as determined
from fixture counts. During peak conditions, system pressures throughout the
development are greater than the required 35 psi. Resulting pressures range from
77 psi to 80 psi. WaterCAD results of the peak demand scenario are included as
Appendix B of this memorandum.
The Stack
Water System Analysis
February 15, 2012
Page 3
Fire Flow Conditions
The fire flow demand of 4,000 gpm was added to peak flow and distributed
evenly at the most hydraulically remote and highest elevation hydrant locations,
represented by Junctions H-1 and H-2.
Results of the fire flow scenario show that residual pressures range from 60 psi to
63 psi, exceeding the minimum 20 psi requirement. Pipe velocities are all less
than the maximum 12 fps. The WaterCAD results for the fire flow scenario are
included in Appendix B.
Conclusion
In conclusion, the water distribution mains proposed for the development exceed
the minimum requirements as described in this memorandum.
Appendix A
Fire Flow Test Results
College Station Utilities
t-e113ble, Afford;able, Community Ovined
Date test completed Wednesday December 28, 2011
Time completed 1:45 P.M.
Test completed by Justin Tamplin
Witness Grant Faust
Location
Nozzle size
Hydrant number
Pitot reading in PSI
Flow in G.P.M.
Location
Hydrant number
Static PSI
Residual PSI
311 College Ave.
2.5
A-021
62
301 College Ave.
A-044
80
Comments This is the 8 inch line
U
College Station Utilities
Reliable, Aifordable, Community Owned
Date test completed Wednesday December 28, 2011
Time completed
Test completed by
Witness
Justin Tamplin
Grant Faust
Comments This is the 12 inch line
Appendix B
Modeling Results
Peak Hourly Demand
FlexTable: Junction Table (TheStack.wtg)
Current Time: 0.000 hours
ID Label Elevation Zone Demand Demand
(ft) Collection (gpm)
<Collection:0
43
7-4
331.52
<None>
0
items>
<Collection:0
49
3-6
331.85
<None>
0
items>
<Collection: 1
64
THE STACK
337.00
<None>
380
items>
Hydraulic Grade Pressure
A (psi)
517.07 80.3
517.11 80.2
516.86 77.8
Bentley Systems, Inc. Haestad Methods Solution Bentley WaterCAD V81 (SELECTseries 1)
TheStack.wtg Center [08.11,01,321
4/6/2012 27 Siemon Company Drive Suite 200 W Page 1 of 1
Watertown, CT 06795 USA +1-203-755-1666
FlexTable: Pipe Table (TheStack.wtg)
Current Time: 0.000 hours
ID Label Length (Scaled) Start Node Stop Node Diameter
(ft) (in)
33
P-1
29.02
R-1
PMP-1
12.0
37
P-8
17.91
PMP-2
R-2
8.0
48
P-5
69.73
H-1
J-4
12.0
50
P-2
37.16
PMP-1
J-6
12.0
51
P-4
48.32
J-6
H-1
12.0
53
P-3
84.33
J-6
H-2
12.0
66
P-7
53.29
THE STACK
PMP-2
8.0
67
P-6
73.56
THE STACK
J-4
8.0
Material Hazen -Williams Has Check Minor Loss Flow Velocity
C Valve? Coefficient (gpm) (ft/s)
(Local)
PVC
150.0
False
0,000
274
0.78
Ductile Iron
90.0
False
0.000
-106
0.68
PVC
150.0
False
0.000
274
0.78
PVC
150.0
False
0.000
274
0.78
PVC
150.0
False
0.000
274
0.78
PVC
150.0
False
0.000
0
0.00
Ductile Iron
130.0
False
0.000
-106
0.68
PVC
150.0
False
0.000
-274
1.75
Headless Has User Length (User
Gradient Defined Length? Defined)
(ft/ft) (ft)
0.000
True
20.00
0.001
True
20.00
0,000
True
136.56
0.000
True
10.00
0.000
True
77.03
0.000
True
333.92
0.000
True
235.73
0.001
True
163.07
Bentley Systems, Inc. Haestad Methods Solution Bentley WaterCAD V8i (SELECTseries 1)
TheStack.wtg Center [08.11.01.32]
4/6/2012 27 Siemon Company Drive Suite 200 W Page 1 of 1
Watertown, CT 06795 USA +1.203-755-1666
Peak Hourly Demand and Fire Flow Demand
FlexTable: Junction Table (TheStack.wtg)
Current Time: 0.000 hours
ID Label Elevation Zone Demand Demand
(ft) Collection (gpm)
43
J-4
331.52
<None>
<Collection:0
0
items>
<Collection:0
49
J-6
331.85
<None>
0
items>
64
THE STACK
337.00
<None>
<Collection: 1
380
items>
Hydraulic Grade Pressure
(ft) (psi)
479.20 63.9
478.97 63.7
482.14 62.8
Bentley Systems, Inc. Haestad Methods Solution Bentley WaterCAD Vei (SELECTsenes 1)
TheStack.wtg Center [08A 1.01 .321
4/6/2012 27 Stemon Company Drive Suite 200 W Page 1 of 1
Watertown, CT 06795 USA +1-203-755-1666
FlexTable: Hydrant Table (TheStack.wtg)
Current Time: 0.000 hours
ID Label Hydrant Status Include Lateral Emitter Lateral Length
Loss? Coefficient (ft)
(gpm/psi^n)
68
H-1
I Closed
False
0.000
20.00
69
H-2
Closed
False
0.000
20.00
Elevation Zone Demand Demand Hydraulic Grade Pressure
(ft) Collection (gpm) (ft) (psi)
336.30
<None>
2,001
478.85
61.7
7<Co11j1,ec.1ion1
emsF337.79
ion:l
<None>
2,000
476.62
60.1
ems>
Bentley Systems, Inc. Haestad Methods Solution Bentley WaterCAD VBi (SELECTsenes 1)
TheStack.wtg Center - [08.11.01.321
4/6/2012 27 Siemon Company Drive Suite 200 W Page 1 of 1
Watertown, CT 06795 USA +1-203-755-1666
FlexTable: Pipe Table (TheStack.wtg)
Current Time: 0.000 hours
ID Label Length Start Stop Node Diameter
(Scaled) Node (in)
(ft)
Material
33
P-1
29.02
R-1
PMP-1
12.0
PVC
37
P-8
17.91
PMP-2
R-2
8.0
Ductile Iron
48
P-5
69.73
H-1
J-4
12.0
PVC
50
P-2
37.16
PMP-1
1-6
12.0
PVC
51
P-4
48.32
3-6
H-1
12.0
PVC
53
P-3
84,33
3-6
H-2
12.0
PVC
66
P-7
53.29
THE
PMP-2
8.0
Ductile Iron
TACK
67
P-6
73.56
THE
J-4
8.0
PVC
STACK
Hazen -Williams Has Check Minor Loss Flow Velocity Headloss
C Valve? Coefficient (gpm) (ft/s) Gradient
(Local) (ft/ft)
150.0
False
0.000
2,854
8.10
0.014
90.0
False
0.000
-1,526
9.74
0.079
150.0
False
0.000
-1,146
3.25
0.003
150.0
False
0.000
2,854
8.10
0,014
150.0
False
0.000
854
2.42
0.001
150.0
False
0.000
2,000
5.67
0.007
130.0
False
0.000
-1,526
9.74
0,040
150.0
False
0.000
1,146
7.31
0.018
Has User Length (User
Defined Length? Defined)
(ft)
True
20.00
True
20.00
True
136.56
True
10.00
True
77.03
True
333.92
True
235.73
True
163.07
Bentley Systems, Inc. Hassled Methods Solution Bentley WaterCAD Val (SELECTseries 1)
TheStack.wtg Center [08.11,01,32]
4/6/2012 27 Siemon Company Drive Suite 200 W Page 1 of 1
Watertown, CT 06795 USA +1-203-755-1666