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6.E. - Page 42 of 73 <br />Agreement for TruePuint-Services - - - - - Exhibit D - Water Budget Methodo.logr <br />Variable <br />Definition <br />KS Species or plant factor relating to a specific plant type's water <br />requirement as a fraction of ETo. <br />KsT Turfgrass water requirement default value. <br />KSS,. Non -Turf water requirement default value, <br />Ksw Water Feature water requirement default value. <br />ETo Reference evapotranspiration (inches) equals the depth of <br />water evaporated and transpired from a reference crop (4 to <br />7 Inch tall fescue grass) with an abundant water supply, ETo is <br />the "standard" measure of water needs from which other <br />plant types are compared via Ks. Redwood City uses ETo from <br />CIMIS weather stations. CIM I5 weather data is accessed <br />through the CIMIS Web API and REST Services more <br />Default Values I Variable <br />KsT or K$N .or <br />Ksw <br />0.8 Constant <br />0.4 Constant E <br />1.2 Constant <br />CIMIS.Seatial Source <br />ZIP: 94065 <br />Information Is available at,http.:/12pt.water.ca.gov/` <br />Redwood <br />City uses the CIMIS Spatial Network data source for ETo <br />collected by Zip Code. <br />....... <br />E111911n(d) Effective.rainfall for each day (d) In inches equals the depth of <br />rain effective in offsetting. ETo for each hydrozone. Effective <br />rainfall varies widely with rainfall frequency, magnitude, time <br />of year, and root zone depth. Effective Rain is calculated <br />separately for Turf and Non -Turf. <br />ERainr(d) Min(Precip(d), (MSCI+ ETo(d) - SSy(d-1))) <br />ERainNT(i) Min(Precip(d), (MSCNT + ETo(d) - SSNT(d.1))) <br />NIR(d) Net Irrigation Requirement: The amount of water required in >= 0 <br />a hydrazone that is not provided by rainfall, NIR Is calculated <br />for each day (d), based on weather data downloaded from <br />specifiedweather websites. NIR is calculated for both turf <br />and non -turf surfaces, since these surfaces have different <br />water storage characteristics, and thus differing requirements <br />for irrigation. NIR is a function of daily precipitation and daily <br />reference evapotranspiration; Should any calculated NIR <br />value be a negative a value of 0 shall be used for NI.R. <br />NIRT(d) NCRT is calculated for Turf using the logic below and the max Calculated, <br />soil constant for turf minimized to 0. <br />Mara, fto(d) - ERain(d) - SST(d-1)) <br />- <br />NIRtvid) NIRNT is calculated for Non -Turf using -the logic below and the <br />max soil constant for non -turf minimized to 0. <br />Max(0, ETo(d)- ERain(d) - SSar(d-1)) <br />NIRQF A default factor to be applied to NIR when historical NIR <br />values are used to calculate water budgets. This accounts for <br />REV: 04-23-19 PR <br />Page 33 of 64 <br />>= a <br />Variable <br />Function <br />Function <br />Function <br />Function <br />Water Budget Methodology Page - 3140 <br />ATTYIAGR.201:8,106!°TruePaint TrueBiCl Utility Billing System <br />