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Agreement for TruePoint Services Exhibit D — Water Budget Methodolo>n <br />EXHIBIT D: <br />Water Budget Methodology <br />The following defines the Water Budget Methodology Implementation and Operational Requirements to <br />be implemented for calculating water budgets for landscape irrigation and residential water utility <br />accounts in Redwood City. Because the methodology is subject to change due to changes in water <br />supply, drought, regulation, or City policy, TruePoint will train City staff so that they are able to <br />configure and modify water budgets with minimal intervention from TruePoint. The term "Customer" in <br />this Exhibit is meant to reference a Redwood City utility customer. <br />Background: <br />Redwood City water budgets are based on the Landscape Coefficient Method that is the standard of the <br />Green Industry. It is endorsed by the Irrigation Association, California Landscape Contractors <br />Association, California Water Efficiency Partnership, and over 300 water agencies as the best <br />methodology for identifying and maximizing landscape irrigation efficiency. Water Budgets are <br />calculated daily for the previous day utilizing weather data retrieved from external web services. At the <br />end of a consumption period water budgets calculated for each day in the consumption period are <br />added to provide a sum total water budget for use by the billing system. <br />Water Budeet Definitions & Variables: <br />Variable <br />Definition <br />Default Values <br />Variable <br />given period. The overall water use budget for a site is the <br />Type <br />BUDGET= <br />Volume of water budgeted for a given hydrozone area for a <br />Formula <br />given period. The overall water use budget for a site is the <br />sum of budgets over all hydrozones. In some cases, during <br />winter months with low ETo and high rainfall it is possible for <br />the aggregate water budget to be equal to 0. The aggregate <br />water budget for any consumption period at the time of <br />billing shall not be less than 2 hcf. The water budget for any <br />one day in the consumption period shall not be less than 0 <br />hcf. <br />AREA <br />Landscape area irrigated in a hydrozone (square feet). <br />AT or ANT or AW <br />AT <br />Turfgrass area in square feet. (If a site-specific variable has <br />Res.= 100 Site Variable <br />not been entered the default value shall be applied for the <br />Non -Res. _ <br />site. Default values differ for residential and non-residential <br />1000 <br />water use types.) <br />ANT <br />Non -Turf area in square feet. (If a site-specific variable has <br />Res.= 250 Site Variable <br />not been entered the default value shall be applied for the <br />Non -Res. = 0 <br />site. Default values differ for residential and non-residential <br />water use types.) <br />AW <br />Water Feature area in square feet. (If a site-specific variable <br />0 Site Variable <br />has not been entered the default value shall be applied for <br />the site.) <br />REV: 04-23-19 PR <br />Page 32 of 64 <br />Water Budget Methodology Page - 32 - <br />ATTYIAGR.2019.106lTruePoint TrueBill Utility Billing System <br />