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6.E. - Paie 49 of73 <br />A reernent or TruePoin't Services Exhibitl) — Water Budget Methodolo <br />I. If WU is unavailable or returns an error the application shall wait 5 minutes and. <br />retry, <br />IL A total of 3 attempts shall be made daily to.retrieve Precip (1 Initial, 2 retries) <br />iii. If all 3 attempts fail to collect Precip for a target date the system shall skip the <br />calculations for NIR and use a historical average NI:R value as a placeholder for <br />the target date (typically yesterday).. <br />iv. The application shall attempt to obtain Precip from WU each day following a <br />failure to obtain Precip for a target date until one of the following conditions are <br />met: <br />1. An authorized user manually enters a Precip value for the target date. <br />2. The Weather Data Override Period has ended. (In this case historical <br />place holder shall become'a permanent part of the water budget for the <br />target date.) <br />c. Calculate Soil Storage for Turf and Non -Turf <br />d. Calculate Effective Rein for Turn and Non -Turf . <br />e, Calculate NIR for Turf and Non -Turf <br />f. Calculate daily Budgets for each account within each Water Use Type/Segment using <br />assigned primary and secondary formulas <br />g. Calculate budgets for normal and closing bills <br />9. The application shall store. daily values calculated by the application for NIRr and. NIRNr for a <br />rolling 5 -year period, <br />a. City users shall have access to review these values, and specified users shall have access <br />to make edits in order to correct errors In calculations or weather data validity. <br />b. These values will be used. In budget calculations when ETo and/or precipitation cannot <br />be obtained. <br />c. Daily values shall be used to calculate a monthly average NIR for Turf and Non -Turf. <br />d. When Historical NIR is used in any budget calculation it shall be multiplied by a constant <br />called NIR default factor to account for potential variances in current weather trends <br />and err in the favor of the customer, The Default factor shall be editable by authorized <br />users and will initially be set at 1.25, <br />e. Historical Average NIR values used In budget calculations shall not populate NIR history, <br />and shall not be used when calculating Historical Average. NIR. Only real NIR values <br />calculated from obtaining ETo and Precip from their respective sources shall be used for <br />historical average calculations, <br />Allert and Notification Reguiremgents: <br />Redwood. City Water Division Staff must be notified when water budget calculations encounter errors <br />during processing. <br />An alert shall be sent to a list of email recipients when either CIMS or WU data services are <br />unreachable or do not respond. The alert shall include an explanation of the error and simple <br />Instructions on what if any actions shall be taken by the user. <br />REV. 04-23-19 PR <br />Page 40 of 64 <br />Water Budget Methodology.Page - 4Q - <br />ATTYIAGR.2019,9061TruePoint TrueDili Utility Billing System 147 <br />