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Agreement for TruePoint Services Exhibit D — Water Budget MethodologT I. If WU is unavailable or returns an error the application shall wait 5 minutes and retry. ii. A total of 3 attempts shall be made daily to retrieve Precip (1 initial, 2 retries) iii. If all 3 attempts fail to collect Precip for a target date the system shall skip the calculations for NIR and use a historical average NIR value as a placeholder for the target date (typically yesterday). iv. The application shall attempt to obtain Precip from WU each day following a failure to obtain Precip for a target date until one of the following conditions are met: 1. An authorized user manually enters a Precip value forthe target date. 2. The Weather Data Override Period has ended. (In this case historical place holder shall become a permanent part of the water budget for the target date.) c. Calculate Soil Storage for Turf and Non -Turf d. Calculate Effective Rain for Turn and Non -Turf e. Calculate NIR for Turf and Non -Turf f. Calculate daily Budgets for each account within each Water Use Type/Segment using assigned primary and secondary formulas g. Calculate budgets for normal and closing bills 9. The application shall store daily values calculated by the application for NIRT and NIRNT for a rolling 5 -year period. a. City users shall have access to review these values, and specified users shall have access to make edits in order to correct errors in calculations or weather data validity. b. These values will be used in budget calculations when ETo and/or Precipitation cannot be obtained. c. Daily values shall be used to calculate a monthly average NIR for Turf and Non -Turf. d. When Historical NIR is used in any budget calculation it shall be multiplied by a constant called NIR default factor to account for potential variances in current weather trends and err in the favor of the customer. The Default factor shall be editable by authorized users and will initially be set at 1.25. e. Historical Average NIR values used in budget calculations shall not populate NIR history, and shall not be used when calculating Historical Average NIR. Only real NIR values calculated from obtaining ETo and Precip from their respective sources shall be used for historical average calculations. Alert and Notification Requirements: Redwood City Water Division Staff must be notified when water budget calculations encounter errors during processing. 1. An alert shall be sent to a list of email recipients when either CIMIS or WU data services are unreachable or do not respond. The alert shall include an explanation of the error and simple instructions on what if any actions shall be taken by the user. REV: 04-23-19 PR Page 40 of 64 Water Budget Methodology Page - 40 - ATTY/AGR.2019.106/TmePoint TrueBill Utility Billing System