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<br /> <br />PPC is a registered trademark of Insurance Services Office, Inc. <br /> Page 19 <br />Item 616 – Credit for Supply System (30 points) <br />The first item reviewed is Item 616 “Credit for Supply System (CSS)”. This item reviews the <br />rate of flow that can be credited at each of the Needed Fire Flow test locations considering the <br />supply works capacity, the main capacity and the hydrant distribution. The lowest flow rate of <br />these items is credited for each representative location. A water system capable of delivering <br />250 gpm or more for a period of two hours plus consumption at the maximum daily rate at the <br />fire location is considered minimum in the ISO review. <br />Where there are 2 or more systems or services distributing water at the same location, credit <br />is given on the basis of the joint protection provided by all systems and services available. <br />The supply works capacity is calculated for each representative Needed Fire Flow test location, <br />considering a variety of water supply sources. These include public water supplies, emergency <br />supplies (usually accessed from neighboring water systems), suction supplies (usually <br />evidenced by dry hydrant installations near a river, lake or other body of water), and supplies <br />developed by a fire department using large diameter hose or vehicles to shuttle water from a <br />source of supply to a fire site. The result is expressed in gallons per minute (gpm). <br />The normal ability of the distribution system to deliver Needed Fire Flows at the selected <br />building locations is reviewed. The results of a flow test at a representative test location will <br />indicate the ability of the water mains (or fire department in the case of fire department supplies) <br />to carry water to that location. <br />The hydrant distribution is reviewed within 1,000 feet of representative test locations measured <br />as hose can be laid by apparatus. <br />For maximum credit, the Needed Fire Flows should be available at each location in the district. <br />Needed Fire Flows of 2,500 gpm or less should be available for 2 hours; and Needed Fire <br />Flows of 3,000 and 3,500 gpm should be obtainable for 3 hours. <br />Item 616 “Credit for Supply System (CSS)” = 16.51 points <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />