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6.E. - Page 41of73 <br />AMetnent for TraeP'oint_Services Exhibit: D -- Water Budget Methodoloin <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, TruePolnt 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 />Variable I Definition ( Defauit Values ( Variable <br />BUDGET= Volume of water budgeted for a given hydrozone area for a 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 />.. ........ <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 />Nan -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 i 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 />ATTYiP,GR.2019.106lTruePoinC TrueEfill Utility Billing Systet 139 <br />