214010-020-mtn-home-2019-10-31-wfps-report

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DocuSign Envelope ID: 1DD36D19-77D0-4780-B72C-98AC28C4B145Mountain Home Water Facilities Planning Study Update October 2019Figure 2.3 – Water Production vs. ConsumptionYearTable 2.4: 2016 – 2018 Unaccounted for WaterRecorded WellProduction(MG/yr)Billing BasedConsumption(MG/yr)AnnualWater Loss(%)2016 53 46 12%2017 48 43 11%2018 52 44 15%Total system demands consist of commercial/industrial and residential demand components. Figure 2.4illustrates the breakdown of water usage in Mountain Home. Residential usage, the total of single familyand multi-family residential, amounts to approximately 73% of the annual water usage. Overall,approximately 70% of the total volume of water consumed is used for irrigation.Figure 2.4 – Average Day Water Usage By Customer ClassCITY OF MOUNTAIN HOME | KA 214010-020 6
DocuSign Envelope ID: 1DD36D19-77D0-4780-B72C-98AC28C4B145Mountain Home Water Facilities Planning Study Update October 2019It is assumed that the residential and commercial demand components of the current per capita demandwill continue to grow at the same rate in the future. From discussions with City staff, it is anticipated thatthere will be an increase in industrial users in the coming years. For the next 20 years, an assumeddemand increase from industrial users of 1,000 gpm was included in analysis. Projections for futureresidential and commercial system demands are based on the existing per capita demands multipliedby future population values, and it is assumed that an additional 50 gpm of industrial demand is addedeach year, beginning in 2020, to accommodate an increase of 1,000 gpm in 20 years. This informationis summarized in Table 2.5.EstimatedYearTotalPopulationTable 2.5 – Future System DemandsAverage DayDemandMax DayDemandPeak HourDemandAverageSummerDay DemandAverageWinter DayDemand2018 14,260 3,000 8,150 14,200 6,340 8302019 14,474 3,050 8,270 14,410 6,440 8402020 14,691 3,140 8,450 14,680 6,580 9102025 15,835 3,580 9,300 16,020 7,290 1,1702030 17,069 3,840 10,010 17,250 7,840 1,2402035 18,398 4,120 10,760 18,570 8,430 1,3202040 19,831 4,420 11,580 20,000 9,070 1,4002.5 WATER STORAGE CRITERIAA detailed storage analysis for Mountain Home is presented in Chapter 3 of this report. However,general recommendations and definitions for various storage components are presented here:‣ Operational Storage. Operational storage is the volume of water drained from the reservoirsduring normal operation before the water sources begin pumping to refill the reservoir. KellerAssociates recommends using approximately 15% of the total storage volume for operationalstorage to provide appropriate pump run times and adequate tank mixing.‣ Peaking or Equalization Storage. Peaking storage refers to the storage required to meet peakhour demands in excess of the supply pumping capacity.‣ Fire Protection Storage. Fire protection storage provides the volume necessary to meetmaximum fire demands for the specified duration.‣ Emergency Storage. Idaho DEQ recommends a minimum volume or emergency supplyequivalent to 8 hours of average day demand for extended power outages. This storage canbe reduced if wells are equipped with standby power.‣ Dead Storage. This is the volume in the reservoir which cannot be used due to physicalconstraints. Generally, this is the volume of storage below the elevation of the tank outlet pipeand above the tank overflow elevation.2.6 DISTRIBUTION NETWORK CRITERIAPlanning for the distribution network involves establishing performance standards for pressures andflows throughout the system. The design flows through the system are the largest flows reasonablyanticipated to occur. For the city of Mountain Home, these flows result from a fire event during thesystem’s maximum day demand.In evaluating fire flow for existing residential areas, we assumed a minimum fire flow requirement of1,000 gpm above 20 psi for 2 hours. It is recommended any new development be provided a minimumfire flow of 1,500 gpm at 20 psi. Aside from residential areas, the Idaho Surveying and Rating Bureau(ISRB) has identified several areas in Mountain Home which currently require more than 1,000 gpm atCITY OF MOUNTAIN HOME | KA 214010-020 7
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214010-020-mtn-home-2019-10-31-wfps-report

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