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BMP-Based Target Setting. Presented by DWR at U4 Technical Subcommittee Meeting on August 25, 2010. Baseline and Targets. Statewide baseline estimated by 20x2020 report 192 GPCD Required target, 80% of baseline 154 GPCD Reduction required by 2020 38 GPCD. Why BMP-Based Targets?.

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bmp based target setting

BMP-Based Target Setting

Presented by DWR at U4 Technical Subcommittee Meeting on

August 25, 2010

baseline and targets
Baseline and Targets
  • Statewide baseline estimated by 20x2020 report
    • 192 GPCD
  • Required target, 80% of baseline
    • 154 GPCD
  • Reduction required by 2020
    • 38 GPCD
why bmp based targets
Why BMP-Based Targets?
  • Takes into account
    • Prior conservation
    • Population density and weather
    • CII intensity
    • Unaccounted for water
  • Savings data available from the 20x2020 study to design the approach and ascertain statewide savings
objectives of the 20x2020 study
Objectives of the 20x2020 Study
  • Assess whether California can achieve a 20% reduction in per-capita use by 2020
  • Identify the mix of measures and approaches required to reach above goal
  • The study goes beyond BMPs to identify potential sources of savings
sources of savings in the 20x2020 study
Sources of Savings in the 20x2020 Study
  • Water Use Efficiency Comprehensive Evaluation (WUECE) used to develop savings estimates
  • Savings under Basic Measures capture
    • plumbing codes, cost-effective and grant funded BMPs, their interactive effect, plus ET controllers
  • Savings under Additional Measures capture
    • Impact of exceeding BMP coverage goals
    • Lower levels of unaccounted for water
    • Irrigation restrictions
    • Recycling and CII PBMPs
our approach to the problem
Our Approach to the Problem
  • Identify BMPs that are easily quantifiable
    • or simplify the quantification method relative to what was used in the WUECE
  • Assess whether selected BMPs achieve the 20% savings goal by 2020
    • If not, evaluate the impact of Additional Measures
  • Develop an overall scaling factor to ensure state reaches its mandated goal
exploratory analyses suggest
Exploratory Analyses Suggest…
  • Models and data exist to quantify the impact of most BMPs
    • CII savings will be quantified as 10% of baseline CII GPCD. WUECE’s methods were more complex
  • Increasing coverage goals in some instances is desirable
    • It raises savings, preserves equity, and simplifies the calculation methodology
components of the savings calculation
Components of the Savings Calculation
  • BMP 1.2 Water Loss Control
    • Savings shall be calculated on the basis of reaching a loss goal <=40 gals/conn/day (from Additional Measures in the 20x2020 report)
  • BMP 1.3 Metering
    • Assume all urban connections are metered prior to 2020: savings 20% of pre-metered use
  • BMP 3.1 Residential Assistance Program
    • Estimate savings potential without including LF showerheads in the calculation: 8.8-21 gpd (mf/sf) at 15% decay
components of the savings calculation1
Components of the Savings Calculation
  • BMP 3.2 Residential Landscape Surveys
    • Evaluate savings potential per the MOU: 15% savings at 10% annual decay
  • BMP 3.3 High Efficiency Clothes Washers
    • 14.4 gpd savings; washer life 14 years; 10% freeridership
  • BMP 3.4 WSS toilets
    • Savings depends on toilet type, program type, and location: see BMP database document
components of the savings calculation2
Components of the Savings Calculation
  • BMP 4 Commercial, Institutional, Industrial
    • Estimate savings as 10% of baseline CII GPCD
  • BMP 5.1 Water budgets for dedicated irrigation
    • Evaluate savings potential per the MOU: 19% savings at 10% annual decay
  • BMP 5.2 Landscape surveys for mixed use CII accounts
    • Captured in BMP 4
components of the savings calculation3
Components of the Savings Calculation
  • For WSS, CII urinals, LF showerheads and HE clothes washers calculate savings potential based on assumed 2020 saturation goals
    • Saturation of 3.5 (or greater) g.p.f. toilets <= 5% by 2020
    • Saturation of non-efficient CII urinals <= 5%
    • Saturation of non-LF showerheads <= 5%
    • Saturation of (WF=6) HE clothes washers >= 85%
model and data requirements
Model and Data Requirements
  • Models to estimate saturation rate of residential and CII WSS, LF showerheads, urinals and HE clothes washers at midpoint of baseline already exist
    • These models factor in the effect of plumbing codes and past active programs
    • Unit savings assumptions from the MOU
  • Data and methods already exist in the MOU for evaluating the remaining BMPs
how does the approach work statewide
How Does the Approach Work Statewide
  • The 20x2020 models suggest that our calculation approach reduces 2020 usage by 36 GPCD
    • This is after including a correction for the simplified CII savings methodology we are proposing relative to the WUECE
  • The target derived from the proposed calculations would be further lowered by 2 GPCD to ensure state reaches its goal