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<br />c.... <br /> <br />1994 MasteT Plan Update <br />Town of Elizabeth <br /> <br />The required fire flow typically is based on the Insurance Services Offices (ISO) <br />cTiteria, which is: <br /> <br />Residential = 2,000 gpm fOT 2 hours = 240,000 gallons <br />Commercial = 3,000 gpm fOT 3 hours = 540.000 gallons <br /> <br />The local fire authority may impose other criteria, This could not be verified prior <br />to publication of this study. Based on knowledge of the Town's water <br />distribution system and since the Town of Elizabeth is predominantly residential, <br />the water system's storage capacity for fire flow may be designed based on the <br />residential storage requirement of 240,000 gallons. It is noted, however. that <br />the system's current storage capacity does exceed the commercial storage <br />Tequirement presented above of 540,000 gallons. <br /> <br />Typically a safety factor is added for the water system supply and is equal to <br />the capacity of the largest well, or to a percentage of the total demand. The <br />safety factor for storage is more subjective, and is evaluated on a case by case <br />basis. Based on discussions with the Town's staff, financial consideTations may <br />preclude the inclusion of a safety factoT at this time. TherefoTe. no safety factor <br />faT the supply and storage systems have been established or included in the <br />calculations pTesented in this study. Note that without a safety factor, the <br />Town will have to rely on the excess capacity that may be available within the <br />basic criteria. aT impose water use restrictions undeT seveTe circumstances. <br /> <br />Water System Demands <br /> <br />Based on the criteria presented above for demands, supply and storage, the <br />following current and projected system demands have been calculated: <br /> <br />Current: <br />Average Annual Demand = 484 SFE x 0.33 ac-ft/yr/SFE = 160 ac-ft/yr <br />Average Day Demand = 484 SFE x 295 gpd/ SFE = 99 gpm <br />Max Day Demand = 2.7x99gpm 270 gpm <br />Peak Hour Demand = 6.0 x 99 gpm = 594 gpm <br />Required Supply 270 gpm + 0 gpm = 270 gpm <br />Required Storage = [594 gpm x 8 hour] + 240.000 gal + 0 gal <br /> = 530,000 gal <br /> <br />Meurer & Associates <br />October 5. 1994 <br />Page 5 <br />