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6.E. - Page 43 of 73 ARTeement. for TruePaint Services Exhibit D 'Water Budget Methodo]M Variable Definition Default Values I Variable potential weather conditions that ate beyond historical average without penalizing customers, -- ...... IE irrigation Efficiency measures the percent of applied water that is beneficially used by plants. All Irrigation systems have some Inefficiencies as water is lost as runoff, overspray, or percolates past the root zone. IET Irrigation Efficiency for Turf. (value determined and Inputted by Redwood City for each sub -site, if there Is not a site- ... ....... _ _...._... - SND Special needs description: Is a note entered by City staff describing the purpose behind the special needs allocation, Precip(d) Rainfall for day d, measured using tipping bucket rain gauges. San Francisco Redwood City uses rainfall data from its own weather station International on the Weather Underground (WU) Network, WU data is Airport, accessed through The Weather Company API for Personal Station ID: Weather Station Contributors more Information is available KSF'O at https://docs.google,com/document/ d/leKCnKX19xnoMG"RRzOLIxPCBihNV2rOetO8gpE eArAY/edit Customer Variable Customer Variable Source Variable MScy Max Soil Constant for Turf in inches. 0.45 Constant MSCUT Max Soil Constant ....... - - _.... SSr(d) Soil Storage for Turf is calculated daily to account for the Function amount of water in the soil following precipitation minimized to 0. Max(O,Min(MSCT, (Precip(d)_- ETo(d) f SST(d-1))))-- - <_.. SSNT(d) a Soil Storage for Non -Turf is calculated daily to account for the Function amount of water in the soil following precipitation minimized REV, 04-23-19 PR Page 34 of 64 Water. Budget Methodology Page - 3 ATT`(f.AGi�.2019,1067Truel�oint Truel3iil Utility Billing System specific value entered the system shall use the defaultvalue of O.5) IE Irrigation Efficiency for Non -Turf default value. 0.8 C,,Factor converting the water budget into gallons. _ _. 0,623 Cz Factor converting the water budget in into hundred cubic feet . 748 (hcf). R Number of fulitime residents (default = 2, provided.by 2 customer and validated by City) Rw Volume of water allocated to l resident per day. DPP Days per period is the total days in a billing calculated period/consumption cycle. SN Special Needs In gallons per day. 0 ... ....... _ _...._... - SND Special needs description: Is a note entered by City staff describing the purpose behind the special needs allocation, Precip(d) Rainfall for day d, measured using tipping bucket rain gauges. San Francisco Redwood City uses rainfall data from its own weather station International on the Weather Underground (WU) Network, WU data is Airport, accessed through The Weather Company API for Personal Station ID: Weather Station Contributors more Information is available KSF'O at https://docs.google,com/document/ d/leKCnKX19xnoMG"RRzOLIxPCBihNV2rOetO8gpE eArAY/edit Customer Variable Customer Variable Source Variable MScy Max Soil Constant for Turf in inches. 0.45 Constant MSCUT Max Soil Constant ....... - - _.... SSr(d) Soil Storage for Turf is calculated daily to account for the Function amount of water in the soil following precipitation minimized to 0. Max(O,Min(MSCT, (Precip(d)_- ETo(d) f SST(d-1))))-- - <_.. SSNT(d) a Soil Storage for Non -Turf is calculated daily to account for the Function amount of water in the soil following precipitation minimized REV, 04-23-19 PR Page 34 of 64 Water. Budget Methodology Page - 3 ATT`(f.AGi�.2019,1067Truel�oint Truel3iil Utility Billing System