Laserfiche WebLink
<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Fire-flow requirements for nonresidential areas are based on construction type, <br />separation distance, and the type of openings in building walls. The Water Service <br />Plan recommends a fire-flow of 3,500 gpm also be used for commercial areas in the <br />City. The Water Service Plan recommends fire-flows for industrial sites be based on <br />ISO rating calculations specific to the industry, <br />In water system design, the requirec\ fire-flow demand is combined with the <br />maximum day demand and should not produce pressures lower than 20 pounds per <br />square inch (psi) at the pumper truck, Taking into account losses in pressure through <br />the hydrant, valve, and hydrant supply line, the minimum pressure in the distribution <br />system at the point of connection to the hydrant supply line should be 30 psi. <br />However, because of the small and scaled lines that exist throughout the City's <br />distribution system, supplying such a pressure to many of the hydrants in Fort Lupton <br />is not possible. In addition, it is not possible to supply 3,500 gallons per minute <br />(gpm) of flow thro1.!gh many hydrants in the City as a result of these system <br />constraints. For the purposes of analysis, maximum fire-flow were assumed to be <br />2,500 gpm in Fort Lupton. The results of these analyses are documented in the <br />Hydraulic Analysis, which has been considered in this study. <br />d. Replenishment. In addition to meeting all the preceding requirements, <br />the distribution system must have the hydraulic capacity to replenish the water <br />storage tanks on a daily basis. Replenishing the volume of storage which is depleted <br />must be accomplished during off-peak hours. The off-peak time allotted for <br />replenishment is usually eight hours and is based on what is known about the City's <br />water usage patterns, an eight-hour interval appears to be appropriate for the City. <br />Replenishment was considered in the analyses of the City's water system, The results <br />of these analyses are documented in the Hydraulic Analysis, which has been con- <br />sidered in this study. <br /> <br />25325,100; 12/07/94 <br /> <br />2-18 <br />