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DWR Method 4 Proposal II

DWR Method 4 Proposal II. Peter Brostrom Urban Water Conservation Manager California Department of Water Resources Water Use and Efficiency Branch. Proposed Method divides urban water use into 3 sectors: Residential CII landscape/water loss. Indoor Residential Savings.

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DWR Method 4 Proposal II

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  1. DWR Method 4 Proposal II Peter Brostrom Urban Water Conservation Manager California Department of Water Resources Water Use and Efficiency Branch

  2. Proposed Method divides urban water use into 3 sectors: Residential CIIlandscape/water loss

  3. Indoor Residential Savings • Residential Savings used the method two indoor residential performance standard of 55 GPCD. • State average based on PWSS equals 69 GPCD • 69 GPCD-55 GPCD = 14 GPCD statewide savings from indoor Residential

  4. CII Savings • Uses the Method II CII savings goal of a 10% reduction • 20x2020 Report estimated statewide CII use at 37 GPCD • Statewide savings of 3.7 or 4 GPCD

  5. Landscape and Water loss Savings • Since statewide landscape area and landscape water use is unknown, it’s hard to estimate savings for landscape • Savings estimate based on subtracting indoor residential savings and CII from the total statewide savings goal (38 GPCD). • 38-14 (IR)- 4 (CII)= 20 GPCD from landscape and water loss

  6. Landscape Savings % • 14 GPCD across the board savings requirement not fair to suppliers with low GPCD • A percentage reduction is calculated by dividing 14 GPCD by state landscape and water loss GPCD • Landscape/water loss GPCD equals 192-69-37= 86 GPCD 20 GPCD/86 GPCD = 23.25%

  7. Statewide Savings Estimate • If state average indoor residential is 69 GPCD • And if every supplier: • Reduces indoor residential use to 55 GPCD • Reduces CII by 10% • Reduces landscape and water loss by 23.5 % • The state will meet the 20% reduction goal in GPCD

  8. Retail Water Supplier Target • Suppliers set water use target using individual numbers and the 3 state standards • Example: A Supplier with baseline per capita water use of 160, indoor residential of 65 and CII water use of 50 GPCD • 65-55= 10 GPCD • (50)10%= 5 GPCD • 160-65-50=45 GPCD, (45) 23.5%= 11 GPCD • 10 +5+ 11=26 GPCD savings target or a 16% reduction

  9. Adjustment for Winter Irrigation • Last meeting, presented an adjustment based on dedicated landscape meters which didn’t work on a statewide basis. • Revised approach uses difference between summer and winter water use and irrigation requirements.

  10. Irrigation Adjustment Factor Winter Meter Readings (Wmr)=Indoor Residential(IR) + Winter Irrigation (WI) Summer Meter Readings (Smr)= Indoor Residential(IR) + Irrigation Requirement Factor(F) x Winter Irrigation (WI)

  11. Summer –Winter Use • Equation developed: Smr-Wmr=(IR+(f)WI)-(IR+WI) =(f)WI-WI =WI(f-1) Or WI= Smr-Wmr/(f-1)

  12. Irrigation Requirement Factor F= 0.7ETos/(0.7ETow-0.25Precip) Example: City of Davis 0.7(7.7)/(0.7*1.5-0.25*3.5)=13.5

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