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SECTION 5 - WATER STORAGE AND DISTRIBUTION SYSTEM <br />A. PURPOSE <br />The purpose of this Section is to evaluate water storage and water system distribution <br />improvements needed to ensure adequate pressure and fire flow are available for both <br />current and future conditions. <br />B. GENERAL <br />The water distribution system for the City of Ramsey was modeled using the Watercad <br />Hydraulic Network Model. The computer network model is used to analyze steady state <br />flows for pipe distribution systems. The information required by the model includes data <br />such as diameter, length, and Hazen -Williams C Factor (the pipes roughness factor) for <br />each pipe in the system. Other data required include ground elevation of pipe junctions, <br />elevated storage water level and water demand on the system. <br />C. WATER SYSTEM SIMULATION CRITERIA <br />In designing and analyzing system simulations, a set of design criteria was established. <br />Recommended Standards for Water Works recommends that a minimum pressure of 20 <br />psi be maintained at all times in the system, with normal working pressure in the 35-70 <br />psi range. Static pressure higher than 100 psi is not recommended as higher pressures <br />increase the frequency of watermain breaks. Fire flow is determined at a minimum <br />residual pressure of 20 psi in order to correlate with the guidelines of the Insurance <br />Services Office (ISO). Fire flows ranges were established between 1500 and 3500 gpm. <br />The water tower levels were established at one-half total capacity during fire flow <br />simulations. <br />D. WATER STORAGE FACILITY IMPROVEMENTS <br />As outlined in Section 3, the City of Ramsey has adequate storage for the design period. <br />Capital improvements over the next 20 years will include maintenance and painting of <br />the existing towers. <br />City of Ramsey, Minnesota — R13.104504 Page 5-1 <br />Comprehensive Water System Study Prepared by Bolton & Menk, Inc. <br />