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HomeMy WebLinkAboutFire Flow Analysis4. �O 3-11-03 T � y C C L 2 0=a2 U adi L Uri N C O rn x dS c as _M W C C N W Cl 'C _ c a C c a a c w W 0 m »dSa u5 a J J 2 Q u Z-j J J W x t- March 10, 2003 i Stewart ,+/00 Woodland Park Ct Arlington, TX 76013 RE: Fire Flow Analysis for Waterwood Condominiums Resubmitted Dear Mr. Stewart: The phase line changes you requested for the Water -wood Condominium project required that Mitchell & Morgan, LLP rerun the fire flow analysis to ensure that the new phases were in compliance with COCS regulations. Because of the phasing changes, the 8" radial connection to the 12" line within the Central Park Lane right-of- way will occur in Phase II, not Phase III as previously reported. The following report details our findings and recommendations to ensure that all buildings are supplied water and all water lines are adequately sized under fire flow conditions. A map of the new phased layout is included in the report. have any questions, please feel free to contact me. Managing Partner Cc: Spencer Thompson file Waterwood Condominiums Water & Fire Flow Analysis Introduction This Fire Flow Analysis report is written to document and analyze the necessary water infrastructure for the Waterwood Condominiums project in College Station, TX. The Waterwood Condominiums is a new development with 28 two-story townhome buildings providing 183 three and four bedroom units. General Location and Description The Waterwood Condominiums are located on the north side of Krenek Tap Road just west of the future Central Park Lane/Krenek Tap Road intersection on Lots 1 & 2 of the E. & M. Jones Farm Place Subdivision. The total acreage of the area being considered for development is approximately 13.7 acres. The condominiums are bordered on the east by the Beautiful Savior Lutheran Church, on the north by Windsor Pointe Apartments, and on the west by scattered residential houses. The Windsor Pointe Apartments development consists of approximately 24 buildings and 194 two and three bedroom units. A twelve -inch (12") water main is located within the right-of-way of Central Park Lane adjacent to Windsor Point Apartments and was constructed by the Windsor Pointe Development. A six-inch (6") water stub -out is located southwest of the Beautiful Savior Lutheran Church. This 6" stub will not be sufficient to service Waterwood Condominiums with fire flow protection. An eight -inch (8") connection could be bored under Krenek Tap Road and connected to the 8" line that runs parallel to Krenek Tap Road; however, the bore would be costly and require depths exceeding ten feet. Instead of boring Krenek Tap Road, M&M recommends a connection to the existing eight -inch (8") line that services the Beautiful Savior Lutheran Church. This line will be extended to provide a water source via an 8" radial feed for Phase I of the Waterwood Condominium Project. An illustration of the phases is shown in Exhibit A. When Phase II begins construction, the eight -inch (8") line will be connected to the twelve -inch (12") main in the Central Park Lane right-of-way for redundancy. Phase III and IV will not require any water line construction except for individual condominium connections. Modeling The water distribution modeling for this project was performed by using the MikeNet 2001 program. M&M utilized the City of College Station YR1999 Water Distribution Model. The YR1999 water model was updated to include recent development in the Texas Avenue area of College Station, specifically the addition of the newly developed Wolf Pen Plaza, HEB/Aggieland Print Shop, Eckerd's, Walgreen's and the new 3.0 MGD elevated water tower and feed. All have been added along Texas Avenue within the last two years. The Waterwood Condominiums domestic and fire flows were then added to this updated model. The evaluation and fire flow criteria used within this study was as follows: • Maintain a minimum of 20 pounds per square inch (psi) residual pressure during fire flow events • Calculated fire flows based upon the 2000 International Fire Code • Maintain velocities during fire flow events to <_12 feet per second (fps) Water Demand Development The Waterwood Condominiums development contains a total of 183 units: 115 three bedroom units and 68 four bedroom units. hi keeping with the criteria used to develop the City of College Station Water Distribution Model, M&M used 115 gallons/capita/day (gpcd) for each unit, with 3.0 persons per unit. Using these figures, the following demands were placed on each node in the corresponding phase: Example Calculation (115 gpcd * 3.0 persons/unit * 27 units)/1440 min/day = 6.47 gpm Phase I Phase II Phase III Phase IV (27 units) (23 units) (67 units) (69 units) 6.47 gpm 5.51 gpm 16.05 gpm 16.53 gpm Fire Flow Analysis Mitchell & Morgan, LLP used Table B105.1 (Exhibit B) from the 2000 International Fire Code to determine fire flow within the site. The largest building area within the Waterwood Condominium development is that of an eight -unit building. Since all buildings within the development are two-story, the largest building area will be approximately 12,400 square feet (sf). The Construction Classification has been determined by Carl Warren, COCS Building Plans Examiner to be Type V. Type V classification is described as "...that type of construction in which the structural elements, exterior walls and interior walls are of any material permitted by [the International Building] code"'. The "a" sub -category is indicative of a fire -resistance rating of one hour for the structural frame (including columns, girders, and trusses) and a one - hour rating for exterior/interior bearing walls. Using Table B 105.1 from the 2000 International Building Code, M&M determined a fire flow of 1750 gpm was necessary at Phase I fire hydrant locations and 2000 gpm for all other fire hydrant locations. The Table 1 represents the results from the fire flow model. Two nodes are listed in Phase III because two different water line segments will be constructed for different fire flow locations during this phase. 1 2000 International Building Code. Section 602.3 "Type W page 87 Table 1: Fire Flow Analysis Results Phase I Node: 2057 Fire flow placed at Node: 1750 gpm Node Pressure: 64.04 psi Line Size: 8 inch Line Velocity: 11.2 fps Largest Building Area: 10,900 sf Phase III Node: 2049 Fire flow placed at Node: 2000 gpm Node Pressure: 89.5 psi Line Size: 8 inch Line Velocity: 8.9 fps Largest Building Area: 12,400 sf / 12,400 sf Phase H Phase IV Node: 2046/2050 Node: 2048 Fire flow placed at Node: 2000 gpm / 2000 gpm Fire flow placed at Node: 2000 gpm Node Pressure: 85.9 psi / 84.9 psi Node Pressure: 93.6 psi Line Size: 8 inch Line Size: 8 inch Line Velocity: 6.5 fps / 7.3 fps Line Velocity: 2.5 fps Largest Building Area: 12,400 sf Largest Building Area: 12,400 sf The Phase I analysis was run with a single radial feed 8" water line from the Beautiful Savior Lutheran Church connection to the Phase I fire hydrant (See Exhibit Q. In Phase II this 8" line was connected to the 12" waterline that will be constructed along Central Park Lane as required by the City of College Station utility master plan. This connection is for redundancy in the system and to help maintain line velocities below 12 fps during fire flow conditions. The 12" waterline extension is being made in Phase H because the secondary access to Central Park Lane, along with the construction of Central Park Lane through the Waterwood property, must be constructed with Phase 11. This waterline will be located in the Central Park Lane right-of-way. By constructing this line with Phase II, we will avoid damaging the internal parking lot pavement. Conclusion To adequately supply water service to the Waterwood Condominium Development, the following should occur: An eight -inch radial line must be provided for Phase I in order to supply the Waterwood Condominiums with adequate fire flow. During Phase II construction, the eight -inch radial line from Phase I will be constructed to Central Park Lane and the twelve -inch line along Central Park Lane will be constructed to meet COCS Water Distribution Master Plan requirements. Exhibit A ct h-� M 4 ^ F-m-� Exhibit B APPENDRB ..�... ^'..,...,. -_ _ TABLE 6105.1 RRE FLOW /9+Aw+s W e4ewf pL.(AY OURAT10R 111dR) 1�rq B'MmYrq M' NWV-A� type M mw Type V B- 0.22.700 0-12700 0.82M 0-5.900 0-3.600 I.500 22,701-30.40 12701-17,000 8.201-10.900 5901-7,9W 3,6014.SW 1.750 30201-38.700 17.001-21,8W 10.901-129W 7,901-9.800 4,8016200 2pW 38.701483W 21.801-242W 17901-17,400 9.801-12.600 6201-7.700 2.250 2 4301-59.000 24MI-332DO 17.401-213W I2601-15.400 7,701-9.400 2S(p 59.W3-709W 33201-39.700 21301-25500 15.401-18.400 9.401-113W 2.750 70,9D1-83.700 39.70147.100 25.501-30.100 18.401-21.800 11301-13.400 3.000 83,701-97.700 47.101-54.9W 30,101-35200 21.801-25" 13.40145.600 3250 97701-114700 54.901-63.40D 3520140.600 25901-293W I5.601-IS.WO 3SW 3 112701-12&700 63,401-72.400 40.60146.400 29301-335W 1&W1-20.6W 3.750 128,701-145,900 72,40142100 46.401-52SW 33501-37.900 20.601-23.300 4.000 145,901-1642W 82,301-9240D 52.501-59.100 37.90142,700 23.301-26300 4250 164201-193.400 92,401-103.100 59.10166,OW 42.70147,700 26301-293W 4300 183-401-203.700 1(13.101-114,6W KODI-733W 47,701-53,OOD 29301-326W 4.750 203,701-2252W 114.6WOI-126.700 7330141.100 53,WI-58.60D 32,W1-36.W0 5.000 225201-247,700 12&701-139A00 81.101-89.200 5&601-65.400 36,W1-39.6001 5250 247,701-2712W 139,401-15260D 89201-97.700 65,401-70.600 39.60143.4W 5500 271201-295900 152601-1665W 97,701-1065W 70.601-77,000 43.40147,40D 5,750 295901-Pa 166501-Carstc 106501-115,800 77,WI43.700 47,401-515W 6,000 4 - - 115.801-1255W 83,701-90.600 51501-55.700 6250 - - 125,501-135500 90.601-97.90D 55.7016020D 6500 - - 135501-145.$W 97.901-106.800 60.20160.800 6.750 - - 145.801-15V00 106,901-113.200 64,801-69.600 7.000 - - 156.701-167,90D 113201-1213W 69.601446W 72M - - 167901479.400 121.30142M00 74.601-79.8W 7500 - - 179-401-191,40D 129,601-138300 79.901-85.100 7.750 - - 191.401-Gant 138301-GTv 85,101-0=carc 8.000 . ,,. +.. . ,y,�e �w. �vvra m-, i gswo pcmimuc � 3.7&5 Lm I pwuW per sgivrz into =6.895 kPa. a 7Ypa Mcanm+x'on se 6ssm on tl.c lrzlcma:iorza( BuildirzR CMe. n Meuuetl s 2D pv. 358 2000 Rt7ER TKWN FIRE CODE® C Exhibit C 'i cn I a o� C�� 'j oM o r- N O O U �vNxn cQ O)ow� Co O N w i p Q iO»NN 0c•E0 ULO 3 :ao Exhibit D I am A N' O V �I 'Uy YI �I'^i � ol R 01 N� 0I eg UII O on u C7� wi ai >I .Vcn GL o v a ri d A 7 �i O\ W O M 03 PO PO _1. 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Texas Ave. College Station, Tx 77840 Attn: Spencer Thompson oa- aBq lI(-7/o3 ,q Sb +emu Re: Waterwood Townhomes Fire Hydrant Location & Sewer Clean -Out Location Dear Spencer, Attached are modifications for your files of the fire hydrant and sewer cleanout relocations. Please note that the fire hydrant has not moved since our last correspondence on this matter. The sewer cleanout however has been further relocated. Tim Stewart with Waterwood condominiums would like to set the cleanout in the sidewalk approximately 10.5 feet from where it currently terminates. Originally we had relocated it from near the brick wall to the planted bed but because of uncertainties with the final elevation of the planted bed we would like to move it to within the sidewalk pavement as we know the final elevation at that location. We have sent a copy of this new layout to Jerry Jones the inspector on the project as well. You will note that these drawings are ones prepared from field measurements by the owner and the landscape designer. It appears that the new cleanout location on the two drawings is slightly different. ] am sure this is based upon the accuracy of those field measurements. The relocation of the cleanout should be placed just slightly inside the sidewalk edge and may vary from 10'-10.5' from it's original location. We hope you find all information in correct order. If you have any questions please give us a call. S4erely, Veronica J. TP.E. Managing Partne Attachments (2) Cc: Jerry Jones, COCS-Public Works Tim Stewart, Waterwood File