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Happy Valley Water & Sewer Study <br />Technical Memorandum <br />Table 1: Water System Siting and Sizing Criteria <br />C-atpgpry <br />Pipe Material for new Mains <br />PVC C900 SDR 18 <br />Minimum Cover' <br />3.5 feet <br />Valves' <br />Minimum number of valves as follows: <br />• At cross intersection — 3 <br />• At tee intersection — 2 <br />• On straight runs so that there shall not be more than 800' <br />between valves. Except in high value areas where maximum <br />spacing is 500' <br />• On all hydrant laterals <br />PRV station between pressure zones <br />Hydrants' <br />• One hydrant within 250' of any existing or proposed structure <br />• In addition, two hydrants within 500' of any commercial <br />multiple, residential, industrial or school building <br />Minimum pipe size' <br />Sizing Criteria��, <br />6" for any line. <br />• 8" under the following conditions <br />• Dead end longer than 500'. <br />• Straight runs longer than 1000' without reinforcement <br />Maximum Velocity' <br />5 feet per second (non -fire flow conditions) <br />Maximum allowable headloss' <br />10 feet per 1000 feet (non -fire flow conditions) <br />Hazen Williams C for new PVC' <br />130 <br />Residential Average Da F Demand' <br />'Fl6w <br />039 m per dwelling unit equivalent (DUE) <br />Maximum Day /Average Day Peaking <br />Factor' <br />2.2 <br />Peak Hour /Maximum Day Peaking Factor' <br />2.5 <br />Peak Hour /Average Day Peaking Factor <br />5.5 <br />Footnotes: <br />1. Per 1984 Design Standards <br />2 It has been assumed that the existing water distribution system has capacity to meet the City's minimum requirements for <br />pressure under both land use scenarios. <br />3. Per recommendations in 2004 Water Master Plan, <br />4. Average day demand assumed for Happy Valley Specific Plan in 'Fable 14-1 of the 2004 Water Master Plan <br />November 2016 <br />