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GATTISENGINEERING
ENGINEERS•CONSULTANTS
P.O.Box 13461 College Station,Texas 77841 •P:979.575.5022 F:979.268.0150 M:979.575.5022
September 13, 2004
Carol Cotter
Development Services
City of College Station
(M) 979-764-3570
Re: Water Design Summary w/Fire Flow Calculations, State Bank Project
Project #: GE08001
Dear Mrs. Cotter,
This letter summarizes and details the design of the proposed 6"water line and
accompanying fire hydrant for the above referenced project. The water line is for fire
protection only, and shall not have any service connections. The water line was
evaluated for this condition only. The proposed water line will be tying into the existing
16"0 water main in the Wellborn Road right-of-way.
The water line will consist of 102 linear feet of 6"0 AWWA C909 CL200 PVC pipe for
a fire hydrant connection. Please see accompanying plan and profile sheet for
construction details. The fire hydrant shall be in accordance with City of College Station
standards.
The criteria used for analyzing the proposed water line came from the TCEQ, Chapter
290 Public Drinking Water Rules &Regulations, the Bryan/College Station Unified
Design Guidelines, and information obtained from the City of College Station Public
Utilities Department.
The following items were analyzed as part of this summary:
1. Line Size Requirements:
a. Based on TCEQ, 290.44(c) minimum size is 2"0
b. Based on B/CS Unified Guidelines, minimum size is 6"0.
2. Pressure Requirements:
a. Per TCEQ f290.44(d), 35 psi and flow rate of 1.5 gpm per connection
b. If fire fighting capabilities are required, 20 psi minimum combined fire
flow and water service capabilities.
3. Fire Flow Requirements:
a. Per City requirements, the requied Fire Flow capabilities are based on
the International Building Code (IBC) that takes into account the type of
building construction and building square footage (Appendix B).
Table 1 illustrates the data used for determining the required fire flow requirements per
the IBC. As shown, the required Fire Flow is 1,500 gpm. There is an existing fire
hydrant on Wellborn Road that is within 1,000 feet, which allows the 1,500 gpm required
fire flow demand to be shared by the existing fire hydrant and the proposed fire hydrant
associated with this project (750 gpm each).
(From Appendix B,International Building Code)
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Fire Flow
Type of Requirements Required Flow
Construction Bldg. Area (sq. ft.) (gpm) Duration (hrs)
Type V-B 2,880 1,500 2
Table 2 illustrates the performance of the proposed water line with the required fire flow
requirements and shows that the proposed velocities will be within City requirements.
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Pipe Dia. Flow Rate Velocity
Average Pressure* (in.) (gpm) (fps)
85 psi 6 750 8.51
*Please see attached Fire Flow Test from the City of College Station Public Utilities Dept.
Please call me if you have any questions.
Respectfully,
GAT EN e EERING, LLC
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Joe . Ga.', PE .�1.'....••**•*....5 .
Pr ject Engineer JOEL arns
90964
Attachment: COCS Fire Flow Test
•
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(tif College Station Utilities
Reliable, 4fforcfable, Community V wnctf
1601 GRAHAM ROAD
COLLEGE STATION TEXAS 77845
Date: 8 SEPTEMBER
Number pages including cover sheet - 1
Fax to: 268-0150
Attention: JOE GATTIS
Company: GATTIS ENGINEERING
From: Butch Willis Water Wastewater Division
Phone: 979-764-3435 Fax: 979-764-3452
FLOW TEST REPORT
Nozzle size: 2.5 inch
Location: 12905 FM 2154
Flow hydrant number: Q-006
Pitot reading: 70
(GPM): 1405
Static hydrant number: Q-092
Static PSI: 80
Residual PSI: 79