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ARROYO LAGO PLEASANTON, CALIFORNIA <br />FEBRUARY 2026 <br />WATER USE CALCULATIONS L-7 <br />WATER TYPE POTABLE <br />SITE ETO=46.2 <br />HYDROZONE # HYDROZONE NAME PLANT WATER <br />USE TYPE <br />PLANT <br />FACTOR (PF) <br />IRRIGATION <br />METHOD <br />IRRIGATION <br />EFFICIENCY ETAF (PF/IE) AREA (SQ. FT) <br />(HA)ETAF X AREA (HA)ETWU <br />(GAL/YR) <br />ACRE FEET/ <br />YEAR HCF/ YEAR PERCENTAGE OF <br />LANDSCAPE <br />1 MIXED LANDSCAPE-L LOW 0.3 DRIP 0.81 0.37 147,709 54,707 1,567,028 4.81 2,094.96 91% 0.740739785 0.274348068 <br />2 MIXED LANDSCAPE - M MOD 0.5 DRIP 0.81 0.62 2,015 1,244 35,628 0.11 47.63 1%0.010104941 0.006237618 <br />3 LAWN - H HIGH 0.7 SPRAY 0.75 0.93 11,796 11,010 315,359 0.97 421.60 7%0.054773403 0.051121842 <br />00 <br />161,520 66,960 1,918,016 5.89 2,564.19 100%0.805618128 0.331707528 <br />HYDROZONE # HYDROZONE NAME <br />3 1 0% <br />TOTALS 0 0% <br />42,478 <br />2,544,618 <br />7.81 <br />3,401.90 <br />1,918,016 ETo = REFERENCE EVAPOTRANSPIRATION ETo = REFERENCE EVAPOTRANSPIRATION <br />5.89 0.55= ET ADJUSTMENT FACTOR PF = PLANT FACTOR FOR HYDROZONES <br />2,564.19 LA=LANDSCAPED AREA (SQUARE FEET)HA = HYDROZONE AREA (SQ.FT) <br />SITE IRRIGATION <br />EFFICIENCY SITE PLANT FACT0R <br />MAWA <br />COMPLIANT IE = IRRIGATION EFFICIENCY (0.81)-BUBBLER/DRIP <br />80.6%0.33 YES IE = IRRIGATION EFFICIENCY (0.75)-ROTORS/SPRAY <br />PLANS WILL COMPLY WITH THE CITY OF PLEASANTON <br />WATER EFFICIENT LANDSCAPE ORDINANCE <br />TOTAL ETAF x AREA 66,960 <br />TOTAL AREA 161,520 <br />AVG. ETAF 41.46% <br />DON’T CHANGE <br />PLANT WATER USE TYPE <br />PLANT FACTOR <br />(PF) <br />IRRIGATION <br />METHOD <br />IRRIGATION <br />EFFICIENCY <br />(IE) <br />---- <br />LOW 0.3 DRIP 0.81 <br />MOD 0.5 BUBBLER 0.81 <br />HIGH 0.8 RINGS 0.81 <br />SPRAY 0.75 <br />ROTORS 0.75 <br />0.62 = CONVERSION FACTOR (GALLONS/SQ.FT/YR)0.62 = CONVERSION FACTOR (GALLONS/SQ.FT/YR) <br />ACRE FEET/YR <br />HCF/YR <br />MAWA FORMULA <br />GALLONS/YR <br />ESTIMATED TOTAL WATER USE (ETWU) GALLONS PER YEAR <br />MAWA <br />ETWU= ((ETO)(.62)(ETAF x LA))MAWA = (ETo)(0.62)[(LA x 0.55) + (0.45 x SLA)] <br />ETWU FORMULA <br />TOTALS <br />MAXIMUM APPLIED WATER ALLOWANCE (MAWA) <br />GALLONS PER YEAR <br />REGULAR LANDSCAPE AREAS <br />GALLONS/YR <br />ETWU <br />ETAF Calculations <br />WATER USE ESTIMATION <br />SPECIAL LANDSCAPE AREAS <br />REGULAR LANDSCAPE AREAS <br />ACRE FEET/YR <br />HCF/YR