2022 01-18 CC PACKET - Laserfiche WebLink

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1/18/2022 Hydraulic modeling • Assdrnptions/Modeled Conditions — Gem Lake. served from a single connection to either White.Bear Lake or White Bear Township • Worst case .scanano !or modelingievaluation purposes Multiple conneclions to whichever City will be supplying water are recommended (to be further explored in subsequent design phases) to provide redundancy and operational flexibility. — All service connections within the City to be fed from new city-wide water distribution. system Existing servicescurrendyfed by other communities are assumed.to be replaeed'wtth new service connections as required — Residential. demand was split evenly.airmng the 216 residential parcels -- Land use based demands were spread evenly among.each.parcel. in localized areas. — Target.system pressures in range of 35 psi to 80 psi — Pipe velocities less than 5 feet per second — Adequate fire protection flows SEH ,:._....._ .� 11 Hydraulic Modeling • Loop based distribution system essentially the same for either White Bear Lake or White Bear Twp. Connection — lntemal demand values and locations some for either scenario White Bear Lake Connection Findings — White Bear Lake. -can provide adequate pressures, with the lowest pressures seen at higher elevation areas to the. west While one watermain :crossing of Hwy 61 could provide adequate fire flows, if the empty agriculture lotto the west assigned as mixed use should develop, two crossings recommerlded.to increase available fire flow to at least2,OQ0. gpm White Bear Twp. Connection Findings — Due to low hyd'raulfc.grade line (low pressures) experienced. within White Bear Township, a.pressure booster station likely required to provide adequate pressures — Pressure booster station needed to provide adequate fire flows f� SEH s::rU;q:aiv:K,•.ro!drar xr„us° 12 M