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Agreement for TruePoint Services Exhibit D — Water Budget Methodolog <br />Variable <br />Definition <br />Default Values <br />Variable <br />average without penalizing customers. <br />IE <br />Type I <br />Water Budget Methodology Page - 34 - <br />ATTYlAGR.2019.106/TruePoint TrueBill Utility Billing System <br />potential weather conditions that are beyond historical <br />average without penalizing customers. <br />IE <br />Irrigation Efficiency measures the percent of applied water <br />IETor IEN <br />that is beneficially used by plants. All irrigation systems have <br />some inefficiencies as water is lost as runoff, overspray, or <br />percolates past the root zone. <br />IET <br />Irrigation Efficiency for Turf. (value determined and inputted <br />0.5 Site Variable <br />by Redwood City for each sub -site, if there is not a site- <br />specific value entered the system shall use the default value <br />of 0.5) <br />IENT <br />Irrigation Efficiency for Non -Turf default value. <br />0.8 Constant <br />C, <br />Factor converting the water budget into gallons. <br />0.623 Constant <br />CZ <br />Factor converting the water budget in into hundred cubic feet <br />748 Constant <br />(hcf). <br />R <br />Number of fulltime residents (default = 2, provided by <br />2 Customer <br />customer and validated by City) <br />Variable <br />Rw <br />Volume of water allocated to 1 resident per day. <br />57.6 Constant <br />DPP <br />Days per period is the total days in a billing <br />calculated <br />period/consumption cycle. <br />SN <br />Special Needs in gallons per day. <br />0 Customer <br />Variable <br />SND <br />Special needs description: is a note entered by City staff <br />Customer <br />describing the purpose behind the special needs allocation. <br />Variable <br />Precip(d) <br />Rainfall for day d, measured using tipping bucket rain gauges. <br />San Francisco Source <br />Redwood City uses rainfall data from its own weather station <br />International Variable <br />on the Weather Underground (WU) Network. WU data is <br />Airport, <br />accessed through The Weather Company API for Personal <br />Station ID: <br />Weather Station Contributors more information is available <br />KSFO <br />at https://docs.google.com/document/ <br />d/le KCn KXI9xnoMG RRzO L1xPCBih N V2rOet08gpE_gArAY/edit <br />MSCI <br />Max Soil Constant for Turf in inches. <br />0.45 Constant <br />MSCNT <br />Max Soil Constant for Non -Turf in inches. <br />0.90 Constant <br />SS-r(d) <br />Soil Storage for Turf is calculated daily to account for the <br />Function <br />amount of water in the soil following precipitation minimized <br />to 0. <br />=Max(O,Min(MSCT, (Precip(d) - ETo(d) + SST(d-1)))) <br />SSNT(d) <br />Soil Storage for Non -Turf is calculated daily to account for the <br />Function <br />amount of water in the soil following precipitation minimized <br />REV: 04-23-19 PR <br />Page 34 of 64 <br />Water Budget Methodology Page - 34 - <br />ATTYlAGR.2019.106/TruePoint TrueBill Utility Billing System <br />