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Carter Addn 3-CS110114 prk DO 8 ,W A D,EY ANDERSON 4A SS ATES INC CIVIL ENGINEERS 5225 Village Creek Drive Suite 200 Plano, Texas 15093 972. 931 -0694 972.931.9538 fax January 14, 2011 Mr. George Marshall, P.E. City of Coppell Engineering 255 Parkway Blvd. Coppell, Texas 75019 RE: Carter Addition Water Pressure and Flow Analysis Dear Mr. Marshall: At the request of the city engineering department we have completed our analysis of the water distribution system adjacent to the location of the proposed Carter Addition. This analysis was done in order to confirm that the existing water distribution system in the area will be sufficient to provide combined fire and domestic flows at sufficient pressures. The attached exhibit shows the locations of the fire hydrants that were tested by the Coppell Fire Department. The pressure plane overflow elevation and map of the city's existing water distribution pipes was taken from the attached City of Coppell Water System Map that was included in the city's impact fee analysis. According to the attached letter from Assistant Fire Marshal David Malone the existing fire hydrants near the proposed Carter Addition are capable of providing the minimum residential fire flow of 1,000gpm required by the ISO for houses that are between 11 and 30 feet apart. (Note: All of the homes in the Carter Addition will be greater than 11' apart.) The results from the attached Fire Marshal's letter are as follows: @psi @psi @psi Hydrant Date Static Residual Pitot GPM 20 10 0 Pub 209.8 5 -23 -10 83 75 50 1186 3615 3914 4195 (443 Carter Dr, Coppell, Tx) Pub 210.15 4-8 -09 76 75 56 1256 3855 4246 4609 (601 Christi Cir. @ S. Moore, Coppell, Tx) Coefficient = .90 2.5 diameter opening. The static, residual and pitot pressures are all well above the minimum TCEQ pressure of 35 psi. (Note: The "pitot" pressure is the pressure at the hydrant while it is open and flowing.) R: \Data \2007\07111 \00\ Correspondence\ Letters \07111 C- Ltr- Coppell- Marshall-2011 -01- 14-Water Pressure.docx w -i k D OWDEY, ANDERSON ffik\% & ASSOCIATES, INC. CIVIL ENGINEERS 5225 Village Creek Drive Suite 200 Plano, Texas 75093 972.931.0694 972.931.9538 fax The Carter Addition will have 8" water lines and is located in a lower portion of Coppell's 672.5' pressure plane with ground elevations in the proposed subdivision between 470' and 490'. Since the Carter Addition 8" water lines will be at lower elevations than the two tested fire hydrants, as can be seen in the attached exhibit, the water pressures in the proposed development will be slightly higher than the pressures shown above. (Note: A drop in elevation of 2.31' corresponds to an increase in water pressure of 1 psi) Given that the test pressures stayed well above the TCEQ minimum's under combined fire and domestic flow conditions there will be no problem with the existing water distribution system providing the same for a development at a lower elevation. This analysis confirms that the existing water infrastructure adjacent to the proposed Carter Addition is sufficient to provide the combined fire and domestic flows needed for the proposed subdivision without negatively affecting the surrounding existing water pressures and flows. Sincerely, i ey Ros P.E. R: \Data \2007\07111 \00 \Correspondence \Letters \07111 C- Ltr- Coppell- Marshall- 2011 -01 -14 -Water Pressure.docx T H E •C 1 T Y •O F COFFELL 1 a q Wednesday, January 12, 2011 Fire Hydrant Flow Test Results The following hydrant locations have been tested and the results were accurate at the date of test: @psi @psi @psi Hydrant Date Static Residual Pilot GPM 20 10 0 Pub 209.8 5 -23 -10 83 75 50 1186 3615 3914 4195 (443 Carter Dr, Coppell, Tx) Pub 210.15 4 -8 -09 76 75 56 1256 3855 4246 4609 (601 Christi Cir. @ S. Moore, Coppell, Tx) Coefficient = .90 2.5 diameter opening. David Malone 1 7 4,1 " 4 7 / . _ Assistant Fire Marshal Coppell Fire Department 500 Southwestern Blvd. Coppell, Texas 75019 255 PARKWAY * P.O,BOX 9478 * COPPELL TX 75019 * TEL 972/462 0022 * FAX 972/304 3673 CHAPTER 7 Other Considerations for Determining Needed Fire Flow (NFF1) • When the subject building or exposure buildings have a wood - shingle roof covering and ISO determines that the roof can contribute to spreading fires, ISO adds 500 gpm to the needed fire flow. • The maximum needed fire flow is 12,000 gpm. The minimum is 500 gpm. • ISO rounds the final calculation of needed fire flow to the nearest 250 gpm if less than 2,500 gpm and to the nearest 500 gpm if greater than 2,500 gpm. • For 1- and 2- family dwellings not exceeding 2 stories in height, ISO uses the following needed fire flows: DISTANCE BETWEEN BUILDINGS NEEDED FIRE FLOW More than 100' 500 gpm 31 -100' 750 gpm 11 -30' 1,000 gpm 10' or less 1,500 gpm • For other types of habitational buildings, the maximum needed fire flow is 3,500 gpm. EDITION 05 -2008 - 24 - COPYRIGHT © ISO PROPERTIES, INC., 2001, 2006, 2008 Figure 3.3 City of Coppell ;' ry J � ! , �,� Water System T2 ,, , ., . f�. 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CARTER ADDITION PHASE 111 • �,, ., , - # CITY OF COPPELL ‘— � � T� . , 1.: • • { n � 1 �� - DALLAS COUNTY,lFXAS o N. , . ., v ' , *� f S, � 1j 1 - �lf 1►NR ON de ASSOCIATES, INC. ti311 PayT�s7S1l1 9725131.114 r � , ' " l C 1l� ■ STATEREGSTRATKN NUMBER: 5.399 o I MB 1CR 1�N. 2011 1'�20P 07111C n r ,