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HomeMy WebLinkAboutWater Report P q- 14-ite-f) 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) .y e. ,`�. -' 3 'S�, �. �A .., ';v;'rk, _a., y `�ta ,s kf,5�..eNzA4tf ."Mi 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. F }K + $` va "a e 3 s ��.i`'.� �+�' � n� � $�''1.`fil`�`"���,�,.��-}-��"'a�Ap��- ��'s--'t ��s:-��'' 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 ompv % Joe . Ga.', PE .�1.'....••**•*....5 . Pr ject Engineer JOEL arns 90964 Attachment: COCS Fire Flow Test • • (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